Electronic Materials Letters最新文献_第10页

Thermoelectric Transport Properties of Co0.5Fe0.5Se2, Co0.5Fe0.5Te2, and Their Solid-Solution Compositions Co0.5Fe0.5Se2、Co0.5Fe0.5Te2 及其固溶体化合物的热电传输特性

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-09-22 DOI: 10.1007/s13391-023-00459-8

Sang Jeong Park, Seyun Kim, Okmin Park, Se Woong Lee, Sang-il Kim

{"title":"Thermoelectric Transport Properties of Co0.5Fe0.5Se2, Co0.5Fe0.5Te2, and Their Solid-Solution Compositions","authors":"Sang Jeong Park, Seyun Kim, Okmin Park, Se Woong Lee, Sang-il Kim","doi":"10.1007/s13391-023-00459-8","DOIUrl":"10.1007/s13391-023-00459-8","url":null,"abstract":"<div><p>Transition-metal chalcogenides with tunable electronic transport properties and unique crystal structures have attracted much attention as potential thermoelectric materials. In this study, the electrical, thermal, and thermoelectrical transport properties of Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub>, Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> and a series of solid-solution compositions (Co<sub>0.5</sub>Fe<sub>0.5</sub>(Se<sub>1−<i>y</i></sub>Te<sub><i>y</i></sub>)<sub>2</sub>, <i>y</i> = 0.25, 0.5, and 0.75) were investigated. Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> polycrystalline alloys exhibited high power factors of 1.37 and 1.53 mW/mK<sup>2</sup> at 600 K, respectively, and their solid-solution compositions exhibited lower power factors between 0.38 and 0.81 mW/mK<sup>2</sup>. The lattice thermal conductivities of Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> were 2.87 and 1.71 W/mK at 300 K, respectively, and their solid-solution compositions exhibited lower lattice thermal conductivities between 0.96 and 1.98 W/mK. Consequently, the thermoelectric figure of merit (<i>zT</i>) of the Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> polycrystalline alloys was 0.16 and 0.18 at 600 K, respectively, and the <i>zT</i> of their solid-solution composition exhibited lower values between 0.04 and 0.09. As the solid-solution composition exhibited a lower thermoelectric performance than the Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> polycrystalline alloys, the lower thermoelectric performance was analyzed and discussed.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 4","pages":"432 - 439"},"PeriodicalIF":2.1,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136060240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Copper, Palladium, and Reduced Graphene Oxide Co-doped Layered WS2/WO3 Nanostructures for Electrocatalytic Hydrogen Generation 用于电催化制氢的铜、钯和还原石墨烯氧化物共掺杂层状 WS2/WO3 纳米结构

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-09-12 DOI: 10.1007/s13391-023-00458-9

Vipin Kumar, Rajneesh Kumar Mishra, Le Gia Trung, Pushpendra Kumar, Sagar M. Mane, Jae Cheol Shin, Jin Seog Gwag

{"title":"Copper, Palladium, and Reduced Graphene Oxide Co-doped Layered WS2/WO3 Nanostructures for Electrocatalytic Hydrogen Generation","authors":"Vipin Kumar, Rajneesh Kumar Mishra, Le Gia Trung, Pushpendra Kumar, Sagar M. Mane, Jae Cheol Shin, Jin Seog Gwag","doi":"10.1007/s13391-023-00458-9","DOIUrl":"10.1007/s13391-023-00458-9","url":null,"abstract":"<div><p>Fossil fuels have a vital role in global energy resources. The burning of fossil fuels produces pollutants and harms the environment. These environmental problems can be solved by searching for a substitute for fossil fuels. Hydrogen production by water electrolysis has emerged as a promising substitute. It is a green, clean, and renewable energy source. Low-cost water is abundant on the Earth. The metal and its composite material have been used to develop water electrolysis. Among these composite catalytic materials, WS<sub>2</sub>/WO<sub>3</sub> composite catalyst is well-known for its excellent physical and chemical behavior in water electrolysis to produce hydrogen. Engineered catalysts can further enhance the catalytic performance. Therefore, we investigate and analyze the catalytic performance of copper (Cu), palladium (Pd), and r-GO co-doped WS<sub>2</sub>/WO<sub>3</sub> composite material for water electrolysis to produce green, clean, and renewable hydrogen energy by hydrogen evolution reaction (HER). The hydrothermal synthesis method is used to prepare the WS<sub>2</sub>/WO<sub>3</sub> composite material co-doped with Cu, Pd, and r-GO. The co-doping is favorable for fast charge transfer by providing many active catalytic sites for HER and enhancing the HER catalytic performance. Therefore, the co-doped tungsten disulfide/oxide could be a potential composite material for efficient water electrolysis for clean and renewable hydrogen production by electrochemical water electrolysis.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 4","pages":"414 - 424"},"PeriodicalIF":2.1,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135878889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electrodeposited Ternary CuNiMo Catalysts for Alkaline Hydrogen Oxidation 用于碱性氢氧化的电沉积三元铜镍钼催化剂

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-09-10 DOI: 10.1007/s13391-023-00457-w

Hong Seong Park, Kyeong-Rim Yeo, Won Suk Jung, Soo-Kil Kim

{"title":"Electrodeposited Ternary CuNiMo Catalysts for Alkaline Hydrogen Oxidation","authors":"Hong Seong Park, Kyeong-Rim Yeo, Won Suk Jung, Soo-Kil Kim","doi":"10.1007/s13391-023-00457-w","DOIUrl":"10.1007/s13391-023-00457-w","url":null,"abstract":"<div><p>In this study, we investigated ternary transition metal catalysts composed of Cu, Ni, and Mo for application to hydrogen oxidation reaction (HOR) in alkaline electrolyte. A series of catalysts with a wide range of elemental compositions were fabricated by a simple electrodeposition method, and their material and electrochemical properties were investigated. In particular, to avoid inaccurate activity measurements due to oxidation and reduction of the transition metal-based catalysts during the HOR test, the electrochemical measurements were performed in both H<sub>2</sub>- and N<sub>2</sub>-saturated electrolytes, and the results were compared. The fabricated CuNiMo catalyst with an optimized composition exhibited an excellent HOR activity of 2.03 mA cm<sup>−2</sup> at 0.1 V<sub>RHE</sub>, while the current density decreased only by 0.55 mA cm<sup>−2</sup> after 3000 cycles. The enhanced HOR activity is attributed to the combined effects of the modified crystal structure, increased surface area, alloying effects beneficial to the hydrogen binding energy and OH<sup>−</sup> binding energy, and appropriate surface compositions between the H-adsorbing metallic state and OH-adsorbing oxophilic states. The characteristics of the catalyst demonstrated in this study can provide insights for the development of non-precious catalysts for HOR in alkaline electrolytes.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 3","pages":"293 - 305"},"PeriodicalIF":2.1,"publicationDate":"2023-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136071650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of Microwave Dielectric Properties of MgTiO3 Ceramics by Ti-Site Complex Substitution ti位络合物取代改善MgTiO3陶瓷的微波介电性能

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-09-05 DOI: 10.1007/s13391-023-00456-x

Jong Seok Chung, Eung Soo Kim

{"title":"Improvement of Microwave Dielectric Properties of MgTiO3 Ceramics by Ti-Site Complex Substitution","authors":"Jong Seok Chung, Eung Soo Kim","doi":"10.1007/s13391-023-00456-x","DOIUrl":"10.1007/s13391-023-00456-x","url":null,"abstract":"<div><p>Microwave dielectric properties of MgTi<sub>1-<i>x</i></sub>(Mn<sub>1/3</sub>Nb<sub>2/3</sub>)<sub><i>x</i></sub>O<sub>3</sub> (0 ≤ <i>x</i> ≤ 0.05) ceramics were investigated based on their crystal structure characteristics. For the specimens sintered at 1400 °C for 4 h, complete solid solutions with a single phase and an ilmenite structure were obtained for the entire range of compositions. The quality factor (<i>Qf</i>) was dependent on the average Ti-site covalency related to the electronegativity difference and the reduction state of Ti<sup>4+</sup>. MgTi<sub>0.995</sub>(Mn<sub>1/3</sub>Nb<sub>2/3</sub>)<sub>0.005</sub>O<sub>3</sub> exhibited the highest <i>Qf</i> value of 212,000 GHz owing to the high average covalency obtained from the Rietveld refinement of X-ray Diffraction patterns, high binding energy, and small full width at half maximum of Ti 2<i>p</i> peaks, as confirmed by X-ray Photoelectron Spectroscopy of MgTiO<sub>3</sub> –based ceramics. The temperature coefficients of the resonant frequency (<i>TCF</i>) of MgTiO<sub>3</sub>-based ceramics were dependent on the degree of average oxygen octahedral distortion of the ilmenite structure. The dielectric constant (<i>K</i>) was affected by the theoretical dielectric polarizability of the constituent ions of sintered specimens. Excellent microwave dielectric properties were obtained for MgTi<sub>0.995</sub>(Mn<sub>1/3</sub>Nb<sub>2/3</sub>)<sub>0.005</sub>O<sub>3</sub>; <i>K</i> = 18.05, <i>Qf</i> = 212,000 GHz, TCF = − 37.04 ppm/°C. The microwave dielectric properties were improved by substituting (Mn<sub>1/3</sub>Nb<sub>2/3</sub>)<sup>4+</sup> for Ti<sup>4+</sup> in MgTiO<sub>3</sub>-based ceramics.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 1","pages":"56 - 64"},"PeriodicalIF":2.1,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44908522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Soluble ‘Ba(Ni-ett)’ (ett = 1,1,2,2-Ethenetetrathiolate) Derived Thermoelectric Material 可溶性‘Ba（Ni ett）’（ett = 1,1,2,2-四硫代乙烯酯）衍生的热电材料

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-09-01 DOI: 10.1007/s13391-023-00454-z

Yaoyang Hu, Geoffrey Rivers, Michael P. Weir, David B. Amabilino, Christopher J. Tuck, Ricky D. Wildman, Oleg Makarovsky, Simon Woodward

{"title":"A Soluble ‘Ba(Ni-ett)’ (ett = 1,1,2,2-Ethenetetrathiolate) Derived Thermoelectric Material","authors":"Yaoyang Hu, Geoffrey Rivers, Michael P. Weir, David B. Amabilino, Christopher J. Tuck, Ricky D. Wildman, Oleg Makarovsky, Simon Woodward","doi":"10.1007/s13391-023-00454-z","DOIUrl":"10.1007/s13391-023-00454-z","url":null,"abstract":"<div><p>We describe the synthesis and characterisation of the first of a new class of soluble ladder oligomeric thermoelectric material based on previously unutilised ethene-1,1,2,2-tetrasulfonic acid. Reaction of Ba(OH)<sub>2</sub> and propionic acid at a 1:1 stoichiometry leads to the formation of the previously unrecognised soluble [Ba(OH)(O<sub>2</sub>CEt)]⋅H<sub>2</sub>O. The latter when used to hydrolyse 1,3,4,6-tetrathiapentalene-2,5-dione (TPD), in the presence of NiCl<sub>2</sub>, forms a new material whose elemental composition is in accord with the formula [(EtCO<sub>2</sub>Ba)<sub>4</sub>Ni<sub>8</sub>{(O<sub>3</sub>S)<sub>2</sub>C = C(SO<sub>3</sub>)<sub>2</sub>}<sub>5</sub>]⋅22H<sub>2</sub>O (<b>4</b>). Compound <b>4</b> can be pressed into pellets, drop-cast as DMSO solutions or ink-jet printed (down to sub-mm resolutions). While its room temperature thermoelectric properties are modest (σ<sub>max</sub> 0.04 S cm<sup>−1</sup> and Seebeck coefficient, α<sub>max</sub> − 25.8 μV K<sup>−1</sup>) we introduce a versatile new oligomeric material that opens new possible synthetic routes for n-type thermoelectrics.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 2","pages":"150 - 157"},"PeriodicalIF":2.1,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13391-023-00454-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48695533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Surface Oxidation on the Magnetic Properties of Fe-Based Amorphous Metal Powder Made by Atomization Methods 表面氧化对雾化法制备铁基非晶金属粉末磁性能的影响

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-08-28 DOI: 10.1007/s13391-023-00455-y

Tae-Kyung Lee, Seung-Wook Kim, Dae-Yong Jeong

{"title":"Effects of Surface Oxidation on the Magnetic Properties of Fe-Based Amorphous Metal Powder Made by Atomization Methods","authors":"Tae-Kyung Lee, Seung-Wook Kim, Dae-Yong Jeong","doi":"10.1007/s13391-023-00455-y","DOIUrl":"10.1007/s13391-023-00455-y","url":null,"abstract":"<div><p>The demand for soft magnetic amorphous metal powders with high saturation magnetization values and low energy loss has increased to achieve high-performance inductors for mobile electronic devices. In this study, Fe-based Fe<sub>92.3</sub>Si<sub>3.5</sub>B<sub>3.0</sub>C<sub>0.7</sub>P<sub>0.5</sub> (wt.%) amorphous metal powders were prepared using different atomization methods for controlling the surface oxidation of the metal alloy powder. Conventional high-pressure water atomization and the newly developed high-speed water screen atomization methods were used for preparation. Regardless of the preparation methods, both alloy powders were amorphous, and their magnetic flux density (<i>B</i>s) values were more than 165 emu/g. Compared to the powders from the conventional high-pressure water atomization method, the amorphous metal powder manufactured using the high-speed water screen atomization process had lower eddy current loss because of the formation of a thin and uniform oxide layer. Furthermore, the magnetic properties of the consolidated magnetic cores fabricated with the amorphous powders produced by the high-speed water screen atomization method using compact-pressing techniques were characterized. Magnetic powders with fewer surface oxidation layers exhibited increased initial permeability and a smaller coercive field, leading to a lower core loss value. The magnetic core made from Fe<sub>92.3</sub>Si<sub>3.5</sub>B<sub>3.0</sub>C<sub>0.7</sub>P<sub>0.5</sub> (wt.%) amorphous powder with an oxide content of 0.12 (wt.%) using the high-speed water screen atomization method exhibited an initial permeability of 25 in the frequency range up to 5 MHz, and a loss of 237 mW/cm<sup>3</sup> with <i>B</i><sub>m</sub> = <span>(0.2,{text{T}})</span> at 1 MHz.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 3","pages":"261 - 268"},"PeriodicalIF":2.1,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42020855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conductive Paste Inks Prepared Using Ionic-Liquid-Stabilized Metal Nanoparticle Fluids and their Sintering Effect 离子液体稳定金属纳米粒子制备导电浆料及其烧结效果

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-08-27 DOI: 10.1007/s13391-023-00451-2

Tae-Gyun Kwon, Younghoon Kim

引用次数: 0

Electrodeposited Hierarchical Silver Network Transparent Conducting Electrodes with Excellent Optoelectronic Properties and Mechanical Flexibility 具有优异光电特性和机械柔性的电沉积分层银网络透明导电电极

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-08-24 DOI: 10.1007/s13391-023-00453-0

Eunyeong Yang, Seoin Kang, Sanghyun Jeong, Kihyun Shin, Jung-Sub Wi, Joon Sik Park, Sangyeob Lee, Choong-Heui Chung

{"title":"Electrodeposited Hierarchical Silver Network Transparent Conducting Electrodes with Excellent Optoelectronic Properties and Mechanical Flexibility","authors":"Eunyeong Yang, Seoin Kang, Sanghyun Jeong, Kihyun Shin, Jung-Sub Wi, Joon Sik Park, Sangyeob Lee, Choong-Heui Chung","doi":"10.1007/s13391-023-00453-0","DOIUrl":"10.1007/s13391-023-00453-0","url":null,"abstract":"<div><p>Mechanically flexible transparent conductive electrodes (TCEs) with high optoelectronic performance are essential for flexible or wearable optoelectronic devices, which are currently receiving a considerable amount of attention. In this study, we investigate the structural, electrical, optical and mechanical properties of electrodeposited hierarchical silver network TCEs consisting of two layers of silver nanowires (AgNWs) and a silver micromesh. Hierarchical structures are known to improve the optoelectronic properties of network-type TCEs. To fabricate an electrodeposited hierarchical network, a AgNW solution is first spun onto a substrate to form randomly distributed AgNWs, and a silver micromesh is then formed on the AgNWs. Subsequently, silver is electrodeposited onto the hierarchical network. As a result of the electrodeposition, AgNW-AgNW and AgNW-silver micromesh contacts are effectively welded, and the dimensions of the AgNWs and the silver micromesh are optimized to maximize the figure of merit of the TCE. Furthermore, the electrodeposited hierarchical silver network shows excellent mechanical flexibility and much less degradation of its sheet resistance than that experienced by ITO upon repeated convex and concave bending. Its resulting optoelectronic and mechanically flexible performance is superior to that of commercialized ITO.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 3","pages":"254 - 260"},"PeriodicalIF":2.1,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52846924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved Performance of Transparent MoS2 Thin-Film Transistor with IZO Electrodes by Air Thermal Annealing 空气热退火改善IZO电极透明MoS2薄膜晶体管的性能

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-08-23 DOI: 10.1007/s13391-023-00450-3

Ju Won Kim, Jin Gi An, Guen Hyung Oh, Joo Hyung Park, TaeWan Kim

{"title":"Improved Performance of Transparent MoS2 Thin-Film Transistor with IZO Electrodes by Air Thermal Annealing","authors":"Ju Won Kim, Jin Gi An, Guen Hyung Oh, Joo Hyung Park, TaeWan Kim","doi":"10.1007/s13391-023-00450-3","DOIUrl":"10.1007/s13391-023-00450-3","url":null,"abstract":"<div><p>Molybdenum disulfide (MoS<sub>2</sub>) grown via metal-organic chemical vapor deposition is known to exhibit high transparency and superior quality. Transparent thin-film transistor (TFT) based on a multilayer MoS<sub>2</sub> film and indium zinc oxide (IZO) using a representative transparent conducting oxide as source and drain electrodes indicate more than 70% transmittance in the visible wavelength. However, the device performance is limited by the large Schottky barrier height corresponding to the high work function of IZO (~ 5.1 eV) and surface impurities generated during the wet transfer process and subsequent oxidation. In this study, we addressed this problem by employing air thermal annealing to improve the TFT device performance. Consequently, contact resistance is reduced ~ 10 times, and the field-effect mobility and on/off ratio measured using ion-gel side gate, which are important parameters for TFT device operation, were enhanced by ~ 59 and ~ 81 times, respectively.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 3","pages":"225 - 231"},"PeriodicalIF":2.1,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47985145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Manipulation of Hole and Exciton Distributions in Organic Light-Emitting Diodes with Dual Emission Layers 双发射层有机发光二极管中空穴和激子分布的操纵

IF 2.1 4区材料科学

Electronic Materials Letters Pub Date : 2023-08-23 DOI: 10.1007/s13391-023-00452-1

Suk-Ho Song, Jae-In Yoo, Hyo-Bin Kim, Sung-Cheon Kang, Kanghoon Kim, Sung-Jae Park, Qun Yan, Jang-Kun Song

{"title":"Manipulation of Hole and Exciton Distributions in Organic Light-Emitting Diodes with Dual Emission Layers","authors":"Suk-Ho Song, Jae-In Yoo, Hyo-Bin Kim, Sung-Cheon Kang, Kanghoon Kim, Sung-Jae Park, Qun Yan, Jang-Kun Song","doi":"10.1007/s13391-023-00452-1","DOIUrl":"10.1007/s13391-023-00452-1","url":null,"abstract":"<div><p>The efficiency improvement of organic light-emitting diodes (OLEDs) is important but challenging. Here, we introduce a unique OLED with a hole modulation layer (HML) in the middle of its emission layer (EML). The external quantum efficiency and power efficiency can be improved by approximately 58% when an HML with optimized thickness is inserted. HML insertion can efficiently retard hole flow, thus improving (<i>i</i>) exciton distribution uniformity and (<i>ii</i>) local electron–hole charge balance. A systematic study of the individual contributions of two EMLs separated by the HML shows that the former factor dominantly works at low current densities (< 10 mA/cm<sup>2</sup>), whereas the latter factor functions over the entire current density range of the OLED. Therefore, the efficiency improvement is greatest at low current densities, which aligns with the typical operating range in display applications. The results provide a deeper understanding of the OLED emission mechanism, and the proposed OLED structure can significantly benefit high-performance OLED displays.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 3","pages":"232 - 242"},"PeriodicalIF":2.1,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46451038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0