Maria Bidikoudi, Christina Tiflidis, Elias Stathatos
{"title":"HTL-Free Perovskite Solar Cells with a Carbon Electrode and Enhanced Stability, Through a Scalable Polymer Treatment Method","authors":"Maria Bidikoudi, Christina Tiflidis, Elias Stathatos","doi":"10.1007/s11664-026-13134-z","DOIUrl":"10.1007/s11664-026-13134-z","url":null,"abstract":"<div><p>Perovskite solar cells with a carbon electrode (C-PSCs) are considered the most promising and viable structure for the upscaling and future commercialization of PSCs. With the ability to be fabricated with industrially compatible methods and with no need for employing hole transport materials, C-PSCs are not randomly moving to the forefront of PSC research at the moment. In this work, hole transport material (HTM)-free C-PSCs have been fabricated under entirely ambient conditions. The devices employ an additive-free, methylammonium-free perovskite, which has been deposited with the infiltration method, with no antisolvent extraction method employed. The solar cells prepared exhibit photocurrent values as high as 26.28 mA/cm<sup>2</sup> , open circuit voltage values as high as 907 mV, fill factor values as high as 0.52, and power conversion efficiency (PCE) up to 12%. With the scope of delivering devices with enhanced lifetime, post-treating the C-PSCs with two different polymers, namely poly methyl methacrylate and poly vinyl pyrrolidone, has been proposed and their efficacy has been evaluated. By using a simple and scalable method, and after optimization of the post-treatment conditions, C-PSCs that retain > 80% of their initial PCE after more than 30 days of storage under uncontrolled ambient conditions (ISOS-D1 protocol) and with no additional encapsulation method employed, have been achieved. The results have been confirmed by x-ray diffraction (XRD) measurements, contact angle measurements, while scanning electron microscopy (SEM) images shed light on the impact of ambient atmosphere overtime in the polymer layers that have been formed, confirming the superiority of poly(methyl methacrylate) as a porotective layer. This result can contribute to the stability issues that PSCs face, during both their fabrication in ambient conditions and their respective devices’ lifetime, and push the technology one step further towards their commercialization.</p></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 11","pages":"9613 - 9633"},"PeriodicalIF":2.8,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11664-026-13134-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Karuppasamy, V. Chithambaram, B. Janarthanan, Mohammed A. H. Ali, Tamer Mohamed Ahmed Khalaf
{"title":"Microwave-Driven Green Extraction of Flower-Based Dyes from Mandevilla sanderi (Flowers and Corolla Tubes) and Musa acuminata (Flowers and Reduced Ovaries) for Dye-Sensitized Solar Cells","authors":"D. Karuppasamy, V. Chithambaram, B. Janarthanan, Mohammed A. H. Ali, Tamer Mohamed Ahmed Khalaf","doi":"10.1007/s11664-026-13117-0","DOIUrl":"10.1007/s11664-026-13117-0","url":null,"abstract":"<div><p>Microwave-assisted dye extraction was carried out to extract the dyes from the flower petals and corolla tubes of <i>Mandevilla sanderi</i> and the flowers and reduced ovaries of <i>Musa acuminata</i>. Ethanolic extraction of the dye solution was undertaken with Fourier transform infrared (FTIR), UV–visible, and photoluminescence analysis for the determination of functional groups and absorption and emission wavelengths. Using Tauc plots, bandgaps of 3.15 eV and 3.26 eV were obtained for the dyes from the flower petals and corolla tubes of <i>M. sanderi</i> and 3.34 eV and 3.10 eV for the flowers and reduced ovaries of <i>M. acuminata</i>. The interaction of the major phytochemical constituents of cyanidin 3-<i>O</i>-[2-<i>O</i>-(xylosyl)-galactoside], quercetin, and kaempferol and cyanidin-3-rutinoside was analyzed. The emission spectrum revealed the rate of recombination of the samples with respect to the intensity of emission peaks. Among the four samples, dye extracted from the flower petals of <i>M. sanderi</i> showed good absorption intensity for the generation of excitons and charge transfer. Electrochemical impedance spectroscopy (EIS) with Nyquist plots was conducted for the four solar cells and showed that the cell with dye from <i>M. sanderi</i> flower petals demonstrated low series resistance (<i>R</i><sub>s</sub>) and recombination resistance (<i>R</i><sub>rec</sub>) of 132.87 Ω and 204.84 Ω. Among the fabricated solar cells, the solar cell with the photosensitizer derived from the <i>M. sanderi</i> flower petals achieved maximum efficiency of 1.06%, with a fill factor of 0.46, short-circuit current density of 3.68 mA/cm<sup>2</sup>, and open-circuit voltage of 0.62 V.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 11","pages":"9597 - 9612"},"PeriodicalIF":2.8,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abhishek Raj, Avneesh Anshul, Manish Kumar, Ajeet K. Srivastav
{"title":"Energy Band Alignment and Interface Defect Optimization in 2D Dion–Jacobson PeDAMA5Pb6I19/3D-CsGeI3 Bilayer Perovskite Solar Cells: A Numerical Study","authors":"Abhishek Raj, Avneesh Anshul, Manish Kumar, Ajeet K. Srivastav","doi":"10.1007/s11664-026-13094-4","DOIUrl":"10.1007/s11664-026-13094-4","url":null,"abstract":"<div><p>Perovskite solar cells (PSCs) have emerged as next generation photovoltaics technology. However, the efficiency and stability of these devices are often limited by recombination processes occurring at interfaces as well as charge losses caused by defects. In the present study, a novel bilayer device based on lead-free perovskite with the structure fluorine-doped tin oxide (FTO)/TiO<sub>2</sub>/PeDAMA<sub>5</sub>Pb<sub>6</sub>I<sub>19</sub>/CsGeI<sub>3</sub>/Spiro-OMeTAD/Ag was investigated via numerical modeling using solar cell capacitance simulation (SCAPS-1D) software. The Dion–Jacobson (DJ)-phase quasi-2D perovskite PeDAMA<sub>5</sub>Pb<sub>6</sub>I<sub>19</sub> was used as an interfacial layer to improve energy-level matching, reduce recombination losses, and boost charge collection. The influence of absorber thickness, defect concentrations in both bulk and interfacial layers, electron affinity, back-contact work function, operation temperature, and parasitic resistances were optimized. The incorporation of PeDAMA<sub>5</sub>Pb<sub>6</sub>I<sub>19</sub> into the structure led to a considerable enhancement of carrier transport and reduced Shockley–Read–Hall recombination rate, resulting in better photovoltaic properties. As a result, the PSCs achieved superior device output with open circuit voltage (<i>V</i><sub>OC</sub>) of 1.33 V, current density (<i>J</i><sub>SC</sub>) of 24.65 mA/cm<sup>2</sup>, fill factor (FF) of 84.32%, and power conversion efficiency (PCE) of 27.54% being enhanced. In comparison with the reference CsGeI<sub>3</sub>-based PSCs, the bilayer structure showed significant enhanced performance, indicating the suitability of DJ-phase/3D heterostructures for high-efficiency, stable, and ecofriendly lead-free PSCs.</p></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 11","pages":"9380 - 9395"},"PeriodicalIF":2.8,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mst. Aysha Siddika, Md. Mehedi Hasan, Abu Muizz Shanto, Thuifique Alam, Muhammad Khairuzzaman, Mst. Rubina Aktar
{"title":"Engineering Optimized Transport Layers for Eco-friendly High-Performance Dual Absorber Solar Cell","authors":"Mst. Aysha Siddika, Md. Mehedi Hasan, Abu Muizz Shanto, Thuifique Alam, Muhammad Khairuzzaman, Mst. Rubina Aktar","doi":"10.1007/s11664-026-13106-3","DOIUrl":"10.1007/s11664-026-13106-3","url":null,"abstract":"<div><p>There has been increasing interest in developing environmentally friendly and efficient solar cells, especially lead-free perovskite options. In this work, a novel lead-free dual-absorber solar cell based on MASnBr<sub>3</sub>/AgBiS<sub>2</sub> is numerically designed and analyzed using absorber materials with complementary bandgaps. This dual-absorber configuration enables broader spectral utilization and enhances photogeneration across the visible and near-infrared regions. A systematic optimization of 56 different hole transport layer (HTL)/electron transport layer (ETL) pairs was carried out to identify energetically favorable interfaces and enable efficient charge extraction pathways. The optimized device configuration achieves a high efficiency of 35.14%, accompanied by an improved fill factor (FF) of 89.21% under negligible radiative recombination. This performance enhancement is achieved through absorber thickness optimization, carrier concentration tuning, and the incorporation of a graphene interfacial layer, which effectively reduces resistive and recombination losses. The impacts of trap density, series and shunt resistances, as well as operating temperature on overall device performance are also systematically analyzed. Radiative recombination was further evaluated by varying the coefficients of both absorbers from 1 × 10<sup>−15</sup> to 1 × 10<sup>−10</sup> cm<sup>3</sup>s<sup>−1</sup>. The device performance remained nearly unchanged up to 1 × 10<sup>−14</sup> cm<sup>3</sup>s<sup>−1</sup>, whereas the efficiency decreased to 16.96% at 1 × 10<sup>−10</sup> cm<sup>3</sup>s<sup>−1</sup>. These results demonstrate the potential of the proposed lead-free architecture while highlighting the importance of radiative recombination in realistic device-performance evaluation.</p></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 11","pages":"9578 - 9596"},"PeriodicalIF":2.8,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rhodium Grating-Assisted Plasmonic Sensor: A Simulation-Based Performance Analysis","authors":"Ankit Kumar Pandey, Sneha Upadhyay","doi":"10.1007/s11664-026-13115-2","DOIUrl":"10.1007/s11664-026-13115-2","url":null,"abstract":"<div><p>Optical sensing in the near-infrared (NIR) region has several advantages, including a large penetration depth towards the analyte sample and no phototoxicity to the bio-analyte. This work theoretically investigates rhodium gratings on a silicon nitride (Si<sub>3</sub>N<sub>4</sub>) substrate-based multi-layered plasmonic structure for sensing of sodium chloride (NaCl) solution in water. Rigorous coupled-wave analysis (RCWA) with consideration of wavelength interrogation (normal incidence of light) is used for numerical simulation. The analysis is directed towards the computation of well-defined performance parameters in terms of angular sensitivity and figure of merit (FoM). Significant high sensitivity (average: 900.5 nm/RIU) and figure of merit (FoM) (average: 136.14 RIU<sup>−1</sup>) values (for an analyte refractive index range of 1.33–1.39) are obtained using the proposed sensor configuration. The performance of the proposed plasmonic sensor is investigated for its application in the detection of salinity content in water.</p></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 11","pages":"9500 - 9506"},"PeriodicalIF":2.8,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gehan Abdelrahman Hassan Hammouda, Ebraheem Abdu Musad Saleh, Kashif Mahmud, Muhammad Zahir Iqbal, Asmaa Fathy Abd El-Aziz Kassem, Nusiba Mohammed Modawe Alshik, Marwa Mostafa Moharam Haqqi Mohammed, Heba A. El-Sabban
{"title":"Correction: Solvothermal Synthesis and Electrochemical Performance of a Zn-BTCA Metal–Organic Framework and its PANI/Nanoporous Graphene Composite for Hybrid Energy-Storage Devices","authors":"Gehan Abdelrahman Hassan Hammouda, Ebraheem Abdu Musad Saleh, Kashif Mahmud, Muhammad Zahir Iqbal, Asmaa Fathy Abd El-Aziz Kassem, Nusiba Mohammed Modawe Alshik, Marwa Mostafa Moharam Haqqi Mohammed, Heba A. El-Sabban","doi":"10.1007/s11664-026-13130-3","DOIUrl":"10.1007/s11664-026-13130-3","url":null,"abstract":"","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 10","pages":"8633 - 8633"},"PeriodicalIF":2.8,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhiyong Chen, Lijun Song, Shicai Xu, Bin Li, Shihui Yu
{"title":"Percolation-Controlled Optoelectronic Transport and Interfacial Stabilization in Flexible SrTiO3/Ag/SrTiO3 Multilayer Transparent Electrodes","authors":"Zhiyong Chen, Lijun Song, Shicai Xu, Bin Li, Shihui Yu","doi":"10.1007/s11664-026-13120-5","DOIUrl":"10.1007/s11664-026-13120-5","url":null,"abstract":"<div><p>Indium-free SrTiO<sub>3</sub>/Ag/SrTiO<sub>3</sub> (STO/Ag/STO) multilayer transparent conductive films were deposited on flexible polycarbonate substrates by room-temperature magnetron sputtering. The influence of Ag mid-layer thickness on the microstructure, optical transmittance, electrical transport, mechanical flexibility, and environmental stability was systematically investigated. As the nominal Ag thickness increased from 5 nm to 17 nm, the Ag layer evolved from isolated islands through a quasi-continuous percolating network to a compact metallic film. This morphological transition governs the transparency–conductivity trade-off through changes in Ag continuity, percolation resistance, carrier scattering, and metal-induced optical losses. The optimized electrode containing an 11-nm Ag layer exhibited an average visible transmittance of 82%, a sheet resistance of 9.2 Ω/sq, and a Haacke figure of merit of 14.2 × 10<sup>−3</sup> Ω<sup>−1</sup>. STO encapsulation also enhanced bending durability and resistance to ultrasonication, acidic corrosion, sulfide attack, and ultraviolet–ozone exposure, consistent with the combined roles of the STO layers in optical regulation, mechanical confinement, and environmental protection. These results establish STO/Ag/STO multilayers as a promising multifunctional transparent-electrode architecture for flexible optoelectronic devices.</p></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 10","pages":"8984 - 8993"},"PeriodicalIF":2.8,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparative Analysis of Inorganic Hole Transport Materials for High-efficiency CsSnI3 Perovskite Solar Cells","authors":"Yunxiang Zhang, Xinru Wang, Yuxin Zhang, Xuerou Wang, Wanru Zhou, Xuekai Huang, Qinfang Zhang","doi":"10.1007/s11664-026-13097-1","DOIUrl":"10.1007/s11664-026-13097-1","url":null,"abstract":"<div><p>To address urgent global energy and environmental challenges, tin-based perovskite solar cells (PSCs) represent a promising avenue toward efficient and low-cost third-generation photovoltaic technology, where the hole transport layer (HTL) critically governs interface charge dynamics. This numerical simulation study thoroughly investigates and compares four HTL materials—Spiro-OMeTAD, NiO<sub><i>x</i></sub>, MoO<sub><i>x</i></sub>, and Cu<sub>2</sub>O—in the device architecture of fluorine-doped tin oxide (FTO)/TiO<sub>2</sub>/CsSnI<sub>3</sub>/HTL/Au to elucidate their physical mechanisms impacting device performance. Key findings reveal that Cu<sub>2</sub>O HTL enables the highest power conversion efficiency (~28.87%) and short-circuit current density (~26.03 mA/cm<sup>2</sup>), optimal energy band alignment, and the strongest internal electric field (~ 3 × 10<sup>6</sup> V/cm), effectively enhancing hole extraction, reducing interface recombination, and promoting charge separation. Furthermore, systematic parameter analysis demonstrates that jointly optimizing Cu<sub>2</sub>O thickness and carrier concentration (higher values) while minimizing defect density synergistically boosts overall performance, achieving higher efficiency. Consequently, Cu<sub>2</sub>O is identified as the most suitable, high-efficiency HTL for CsSnI<sub>3</sub>-based PSCs, offering valuable insights for advancing optimized, efficient “unleaded” perovskite solar cells.</p></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 10","pages":"8791 - 8808"},"PeriodicalIF":2.8,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gang Yan, Rui Wang, Cuiwei Yin, Qi Zhao, Xuzheng Cao, Hao Zhang, Hongfei Shi
{"title":"In Situ-Synthesized Bi2S3/BiOI with S-Scheme Heterojunction as a High-Efficiency Photocatalyst for Formaldehyde and Methyl Orange Degradation","authors":"Gang Yan, Rui Wang, Cuiwei Yin, Qi Zhao, Xuzheng Cao, Hao Zhang, Hongfei Shi","doi":"10.1007/s11664-026-13102-7","DOIUrl":"10.1007/s11664-026-13102-7","url":null,"abstract":"<div><p>An effective approach to eliminating organic pollutants is to develop step-scheme (S-scheme) heterojunction photocatalysts, because such heterojunctions can effectively promote photogenerated carrier separation while maximally retaining strong redox capability. Herein, S-scheme Bi<sub>2</sub>S<sub>3</sub>/BiOI (BBS) photocatalysts were synthesized using the <i>in situ</i> ion exchange method. Morphology and structure of BBS, as well as its photoelectrochemical properties, among others, were studied and analyzed. The photocatalytic activity of BBS was evaluated by degrading formaldehyde (HCHO) and methyl orange (MO). Compared with BiOI and Bi<sub>2</sub>S<sub>3</sub>, BBS catalysts demonstrated a remarkable improvement in photocatalytic performance under irradiation with visible light (<i>λ</i> > 400 nm). With the highest photocatalytic efficiency, BBS-0.01 achieved degradation rates of 80% for HCHO (0.16 mg L<sup>−1</sup>) in 90 min and 97% for MO in 210 min. This notable enhancement in photocatalytic performance is attributed to the <i>in situ</i> ion exchange method, which constructs heterojunctions with intimate interfacial contact, uniform component distribution, high carrier separation efficiency, abundant active sites, and excellent stability. Furthermore, the S-scheme heterostructure further enhances catalytic performance owing to its well-matched energy band structures, efficient carrier separation, and the combined effect with the internal electric field (IEF). In addition, BBS photocatalysts exhibit a stronger visible-light response capability, consequently enhancing the overall photocatalytic efficiency. Hence, the BBS heterojunction photocatalyst presented in this work is a highly promising material for environmental applications under visible light.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 10","pages":"8809 - 8824"},"PeriodicalIF":2.8,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lingyu Huo, Muci Li, Sheng Du, Hao Sun, Xi Zeng, Yinglin Xiao, Jia Yuan, Xiaowen Zhang
{"title":"Investigation on Bipolar Carrier Injection Materials of Ni-, Co-, Zn-Doped Urea and their Applications in Organic Light-Emitting Diodes","authors":"Lingyu Huo, Muci Li, Sheng Du, Hao Sun, Xi Zeng, Yinglin Xiao, Jia Yuan, Xiaowen Zhang","doi":"10.1007/s11664-026-13104-5","DOIUrl":"10.1007/s11664-026-13104-5","url":null,"abstract":"<div><p>Transition metals are widely used in electronic devices, owing to their variable valence states and excellent electron transfer characteristics. Herein, several bipolar carrier injection materials of transition metal (Ni, Co, Zn)-doped urea were synthesized using a facile hydrothermal method. The film surface morphology, element mapping, chemical bonding state, and bipolar carrier injection capacity were systematically characterized by atomic force microscopy, scanning electron microscopy, x-ray photoelectron spectroscopy, and impedance spectroscopy. Urea+Ni exhibits superior carrier injection capacity compared with urea+Co and urea+Zn. Using 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ) as an emitter, the urea+Ni-based inverted organic light-emitting diode (OLED) shows external quantum efficiency (EQE) of 1.19% and radiance of 12.9 mW/cm<sup>2</sup> at 14 V, while the conventional OLED exhibits EQE of 1.73% and radiance of 4.3 mW/cm<sup>2</sup> at 10 V, together with typical ultraviolet (UV) emission from the TAZ molecule and voltage-independent electroluminescence spectra. The carrier recombination regions of both inverted and conventional OLEDs are demonstrated by finite-difference time-domain simulation. The reasons for the difference in OLED performance are further explained by experimental and simulated data. Our experiments provide an alternative approach for developing solution-processed bipolar carrier injection materials and advancing OLEDs.</p></div>","PeriodicalId":626,"journal":{"name":"Journal of Electronic Materials","volume":"55 10","pages":"9112 - 9122"},"PeriodicalIF":2.8,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}