Applied Physics Letters最新文献_第2页

The impact of laser and growth rate on trap formation in conventional and laser-assisted MOCVD GaN 激光和生长速率对常规和激光辅助MOCVD GaN中陷阱形成的影响

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-07 DOI: 10.1063/5.0276417

Wenbo Li, Yuxuan Zhang, Vijay Gopal Thirupakuzi Vangipuram, Hongping Zhao, Steven A. Ringel, Aaron R. Arehart

引用次数: 0

Deactivating charged states in colloidal quantum dots by Förster resonance energy transfer 通过Förster共振能量转移使胶体量子点中的带电态失活

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-07 DOI: 10.1063/5.0276307

Mi Gu, Depeng Li, Jingrui Ma, Lei Jin, Lars Samuelson, Xiao Wei Sun

{"title":"Deactivating charged states in colloidal quantum dots by Förster resonance energy transfer","authors":"Mi Gu, Depeng Li, Jingrui Ma, Lei Jin, Lars Samuelson, Xiao Wei Sun","doi":"10.1063/5.0276307","DOIUrl":"https://doi.org/10.1063/5.0276307","url":null,"abstract":"Colloidal quantum dots (QDs) possess size/shape/surface-tunable optical and electronic properties, making them promising building blocks for optoelectronic applications. However, the fluorescence intermittency, also known as “blinking,” observed in individual QDs is a pervasive phenomenon. The dark state (trion state) in blinking experiences non-radiative recombination processes, such as trap-mediated recombination and Auger–Meitner recombination, which significantly diminish the quantum efficiency of the QDs. Despite efforts to mitigate blinking phenomena through chemical engineering of QDs structures and their environments, blinking continues to impede the application of single QDs, particularly in single photon sources. This study demonstrates that Förster resonance energy transfer (FRET) from green QDs (donor) to individual red QDs (acceptor) can effectively suppress fluorescence intermittency. The findings indicate that FRET facilitates the removal of excess charges from the charged state (dark state, trion state), allowing the QDs to transition from the lower quantum yield trion state to the higher quantum yield single-exciton state (bright state). Our research confirms that FRET can inhibit fluorescence intermittency by deactivating the charged state.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"8 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145234978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced channel mobility of hexagonal boron nitride/hydrogen-terminated diamond heterojunction field-effect transistor 六方氮化硼/端氢金刚石异质结场效应晶体管的沟道迁移率增强

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-07 DOI: 10.1063/5.0272041

Yosuke Sasama, Takuya Iwasaki, Masataka Imura, Kenji Watanabe, Takashi Taniguchi, Yamaguchi Takahide

引用次数: 0

Dipole-molecular buffer interface engineering for mitigating hole injection barrier and interface defect in high-efficiency quasi-2D blue perovskite light-emitting diodes 高效准二维蓝钙钛矿发光二极管空穴注入势垒和界面缺陷的偶极子-分子缓冲界面工程

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-07 DOI: 10.1063/5.0287351

Hongxin Liu, Zhewei Li, Yuxia Mei, Min Gong, Sijie Zhang

{"title":"Dipole-molecular buffer interface engineering for mitigating hole injection barrier and interface defect in high-efficiency quasi-2D blue perovskite light-emitting diodes","authors":"Hongxin Liu, Zhewei Li, Yuxia Mei, Min Gong, Sijie Zhang","doi":"10.1063/5.0287351","DOIUrl":"https://doi.org/10.1063/5.0287351","url":null,"abstract":"The quasi-two-dimensional (quasi-2D) perovskites, characterized by strong quantum confinement and high exciton binding energy, hold significant promise for blue perovskite light-emitting diodes (PeLEDs). However, challenges including imbalanced charge injection and defect-related nonradiative recombination at the interface, particularly at the hole transport layer (HTL)/perovskite interface, hinder the development of efficient PeLEDs. This investigation systematically evaluates the effect of various dipolar molecules on the HTL/perovskite interface, aiming to enhance the efficiency of blue PeLEDs. The results indicate that the hole injection barrier of devices modified with diethyl difluoromethanephosphonate (DFMP) was significantly reduced due to the high polarity of DFMP, which maintains a balanced hole–electron mobility. Furthermore, the electron-rich P=O bond in DFMP effectively coordinates with the unsaturated Pb2+ at the buried interface to passivate defects that contribute to radiative recombination. As a result, the DFMP-modified PeLEDs achieve a peak external quantum efficiency of 9.8% at 480 nm and a prolonged operational lifetime. The study paves the way for interfacial molecular buffer layers to interface modulation in quasi-2D PeLEDs.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"112 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145241460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polarization-resolved surface and bulk states in CsPbBr3 single crystals via second harmonic generation 通过二次谐波产生CsPbBr3单晶的偏振分辨表面和体态

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-06 DOI: 10.1063/5.0291184

Shixiong Zhang, Weizhi Yu, Junkang Wu, Yingming Song, Ruiming Li, Hongri Liu, Meifeng Liu, Weikun Ge, Ning Tang

{"title":"Polarization-resolved surface and bulk states in CsPbBr3 single crystals via second harmonic generation","authors":"Shixiong Zhang, Weizhi Yu, Junkang Wu, Yingming Song, Ruiming Li, Hongri Liu, Meifeng Liu, Weikun Ge, Ning Tang","doi":"10.1063/5.0291184","DOIUrl":"https://doi.org/10.1063/5.0291184","url":null,"abstract":"Due to their superior electronic and optical properties, halide perovskite single crystals have been potential candidates for developing high-efficiency optoelectronic devices. Defect states located on the surface or within the bulk of single crystals play a crucial role in determining the performance of devices. In this work, the surface and bulk states in CsPbBr3 single crystals were investigated by polarization-resolved second harmonic generation (SHG) measurements. Onefold anisotropy of SHG intensity indicates that the polycrystalline Cs4PbBr6 and CsPb2Br5 phases dominate the surface, which exhibits Cs symmetry. Moreover, an unpolarized and strong luminescence was observed induced by two-photon absorption, which displays a twofold symmetry. Br vacancies within the bulk were identified as the radiative recombination centers according to their energy level position. These experimental results not only establish a method for distinguishing between surface and bulk states but also facilitate a deeper understanding of the optical properties of defect states in CsPbBr3 single crystals.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"21 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monolithic integrated β -Ga2O3 inverters using charge trapping technique 利用电荷俘获技术的单片集成β -Ga2O3逆变器

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-06 DOI: 10.1063/5.0287286

MuJun Li, MingHao He, XiaoHui Wang, Yang Jiang, HaoZhe Yu, ChenKai Deng, Kah-Wee Ang, Qing Wang, HongYu Yu

引用次数: 0

Tailoring energy storage performance of BaTiO3–CeO2 lead-free films via nanostructure design and crystalline orientation 通过纳米结构设计和晶体取向调整BaTiO3-CeO2无铅薄膜的储能性能

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-06 DOI: 10.1063/5.0294093

Zhengyang Kong, Yufan Guo, Zhen Huang, Kun Han, Liqiang Xu

{"title":"Tailoring energy storage performance of BaTiO3–CeO2 lead-free films via nanostructure design and crystalline orientation","authors":"Zhengyang Kong, Yufan Guo, Zhen Huang, Kun Han, Liqiang Xu","doi":"10.1063/5.0294093","DOIUrl":"https://doi.org/10.1063/5.0294093","url":null,"abstract":"Relaxor ferroelectrics are promising for high-performance energy storage applications, particularly in miniaturized electronic devices and power systems. Herein, we investigate the influence of CeO2 doping on the structural and polarization behavior of (1 − x)BaTiO3−xCeO2 [(1 − x)BT−xC, 0.0 ≤ x ≤ 0.5] films. Our results show that the incorporation of CeO2 into BaTiO3 matrix induces chemical and structural heterogeneity, which effectively suppresses hysteresis, achieving a large energy storage density Ue of ∼37.6 J/cm3 and a high efficiency η of ∼80% for 0.7BT-0.3C films grown on Nb-SrTiO3 (001) substrates. The orientation control further refined the energy storage properties, with 0.7BT-0.3C films grown on (110)- and (111)-oriented Nb-SrTiO3 substrates exhibiting improved Ue of 44.8 and 46.8 J/cm3. The frequency and thermal stability analyses revealed that the nanostructured BaTiO3-based films maintained stable energy storage performance across a wide frequency range from 20 Hz to 10 kHz, and temperature range from 25 to 160 °C. These findings suggest the potential of nanostructure engineering and orientation control in improving the energy storage performance of BaTiO3-based films for advanced applications.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"26 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A highly efficient photodetector for squeezed light measurement in the gigahertz range 用于千兆赫范围内压缩光测量的高效光电探测器

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-06 DOI: 10.1063/5.0290396

Dennis Wilken, Jonas Junker, Michèle Heurs

引用次数: 0

A postbuckling-based metamaterial for switching the propagation of surface acoustic waves 一种用于转换表面声波传播的基于后屈曲的超材料

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-06 DOI: 10.1063/5.0297652

F. Aloschi, F. Zeighami, A. Palermo, C. Daraio

{"title":"A postbuckling-based metamaterial for switching the propagation of surface acoustic waves","authors":"F. Aloschi, F. Zeighami, A. Palermo, C. Daraio","doi":"10.1063/5.0297652","DOIUrl":"https://doi.org/10.1063/5.0297652","url":null,"abstract":"The use of periodic materials for wave control and signal processing has been a focus of intensive research over the past two decades and continues to garner significant attention. Common signal processing mechanisms like switches and rectifiers often depend on magnetic fields and/or logic gates for their activation. We propose a metamaterial that enables the control of mechanical waves—surface acoustic waves—through an ON–OFF mechanism that switches the propagation of the waves through a tunable platform of elastic beams. In the OFF configuration, the beams remain in their undeformed state and resonate at a specific frequency range, creating a bandgap that stops wave propagation. Conversely, in the ON configuration, the beams undergo buckling, redistributing the vibration energy across multiple modes and eliminating the bandgap, thus allowing wave propagation. Analytical and numerical findings demonstrate the significant potential of this mechanism for controlling wave propagation in nonlinear periodic materials. This switching mechanism relies purely on mechanical processes, thereby eliminating the need for external fields.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"41 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multifunctional hole transport layer enhances high-performance pure-red perovskite quantum-dot light-emitting diodes 多功能空穴传输层增强了高性能纯红钙钛矿量子点发光二极管

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-10-06 DOI: 10.1063/5.0284362

Shuyan Fang, Zhichao Chen, Xuanang Luo, Chenhui Su, Lei Ying, Shijian Su, Jibin Zhang, Ziyang Hu, Lintao Hou

{"title":"Multifunctional hole transport layer enhances high-performance pure-red perovskite quantum-dot light-emitting diodes","authors":"Shuyan Fang, Zhichao Chen, Xuanang Luo, Chenhui Su, Lei Ying, Shijian Su, Jibin Zhang, Ziyang Hu, Lintao Hou","doi":"10.1063/5.0284362","DOIUrl":"https://doi.org/10.1063/5.0284362","url":null,"abstract":"The performance of perovskite light-emitting diodes (PeLEDs) has advanced rapidly; however, the development of suitable hole transport layers (HTLs) for PeLEDs remains a critical challenge. This study introduces a multifunctional HTL of poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4′-(N-(4-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]phenyl)diphenylamine))] (TFTEG), which features a backbone similar to that of the commercial hole transport material poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4′-(N-(4-sec-butylphenyl)diphenylamine))] (TFB), while its side chain is modified to include multiple ether groups. Theoretical calculations and experimental characterizations demonstrate that TFTEG not only significantly enhances hole injection but also effectively passivates uncoordinated Pb2+ defects at the buried interface through Lewis acid–base interactions. This substantially improves the photoluminescence and electroluminescence (EL) quantum yields of perovskite quantum dots (QDs). Pure-red quantum-dot PeLEDs that employ TFTEG as the HTL achieve a maximum external quantum efficiency of 9.67%, which signifies a substantial enhancement over the 4.56% efficiency observed in control devices utilizing the commercial TFB HTL. Furthermore, TFTEG contributes to a reduced turn-on voltage, enhanced brightness (1741 vs 888 cd m−2), and a stable EL spectrum peaking at 650 nm. The rapid response characteristics underscore its promising potential for high-speed optoelectronic applications, such as wireless communication systems.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"111 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0