Article
Chemistry, Physical
Hengshan Wang, Yanan Bao, Jing Li, Dongwen Li, Meiqi An, Lingzhi Tang, Jianliang Li, Huayi Tang, Yaodan Chi, Jiao Xu, Yiming Yang
Summary: The coupled transport of ions and electrons in halide perovskites can lead to highly anisotropic ionic transport and enhanced local electric fields. This study investigates the ion dynamics in single-crystalline perovskite nanoplates and demonstrates the influence of external bias on ion transport. The findings deepen the understanding of ion behavior in perovskites and have implications for downsizing micro- and nanoiontronic and ion-optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Andrew H. Proppe, Andrew Johnston, Sam Teale, Arup Mahata, Rafael Quintero-Bermudez, Eui Hyuk Jung, Luke Grater, Teng Cui, Tobin Filleter, Chang-Yong Kim, Shana O. Kelley, Filippo De Angelis, Edward H. Sargent
Summary: Many top-performing perovskite photovoltaic devices utilize 2D/3D interfaces to enhance efficiency and stability. This study reveals the gradual dimensional reduction process from 3D to 2D perovskites.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Fucai Cui, Peng Zhang, Longzhen Zhang, Yunqiu Hua, Xue Sun, Xiang Li, Guodong Zhang, Xutang Tao
Summary: This study presents a liquid-phase epitaxial method to construct perovskite single-crystal heterojunctions, effectively suppressing ion migration in three-dimensional halide perovskites and enabling the creation of high-performance X-ray detectors. The constructed MAPbBr3/CsPbBr3 heterojunction exhibits a record-high sensitivity and a low detection limit, while suppressing dark current drift even in a high reverse electric field.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Akriti, Enzheng Shi, Stephen B. Shiring, Jiaqi Yang, Cindy L. Atencio-Martinez, Biao Yuan, Xiangchen Hu, Yao Gao, Blake P. Finkenauer, Alan J. Pistone, Yi Yu, Peilin Liao, Brett M. Savoie, Letian Dou
Summary: The use of two-dimensional halide perovskites improves chemical stability and suppresses anionic diffusion in solid-state devices, leading to enhanced device performance. However, the role of organic cations in inhibiting anionic diffusion is not yet fully understood. Our quantitative investigation of anionic interdiffusion in atomically flat 2D vertical heterojunctions reveals a 'quantized' layer-by-layer diffusion model that provides important insights into the mechanism of anionic diffusion in 2D perovskites.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Physical
He Guan, Jian Sha, Zhejia Zhang, Yuxuan Xiong, Xiangqi Dong, Han Bao, Kai Sun, Shaoxi Wang, Yucheng Wang
Summary: This study utilized CsFAMAPbIBr as the functional layer of the memristor and successfully reduced the power consumption of OTP memristor by optical and oxide modification, achieving a low-power OTP memristor.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Yi Liu, Wuqian Guo, Lina Hua, Xi Zeng, Tian Yang, Qingshun Fan, Yu Ma, Changhao Gao, Zhihua Sun, Junhua Luo
Summary: In this study, a strong anomalous photovoltaic (APV) effect was demonstrated in a 2D hybrid perovskite ferroelectric material, achieved by alloying mixed organic cations. The material exhibited a high level of polarization sensitivity, with a giant current ratio and an above-bandgap photovoltage exceeding its bandgap. This research sheds light on the exploration of APV-active ferroelectrics and inspires their future optoelectronic device applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Applied
Insang You, Yong-Young Noh
Summary: This Perspective provides a brief overview of the development of high-performance Sn-based perovskite TFTs, highlighting the advantages of Sn-based MHPs for TFTs and recent studies on improving device performance. The challenges that need to be addressed to achieve high-performance TFTs are also emphasized.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Tirupati Saketh Chandra, Abhimanyu Singareddy, Kashimul Hossain, Dhyana Sivadas, Swasti Bhatia, Shivam Singh, Dinesh Kabra, Pradeep R. Nair
Summary: The study found that in perovskite materials, the delay of large signal switching is influenced by electronic dipoles rather than ionic dipoles, which is contrary to the widely accepted belief. Through numerical simulations and experimental results, it was found that the delay of large signal switching is independent of ion mobility, which has important implications for the understanding and optimization of perovskite electronic devices.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Saikiran Khamgaonkar, Qiaoyun Chen, Kevin Musselman, Vivek Maheshwari
Summary: Polymer-integrated perovskite photocathodes with highly efficient and stable performance have been successfully fabricated and coupled with an Au-Pt-Ni bimetallic catalyst for hydrogen evolution in both acidic and alkaline conditions. The polymer-integrated photocathodes exhibited high hydrogen evolution photocurrent density (around 20 mA cm-2), high onset potential (around 0.95 V), and HC-STH (half-cell solar to hydrogen conversion efficiency) of 10.11%. Moreover, the stability of the perovskite photocathodes in sulfuric acid and potassium hydroxide was significantly improved by polymer additive engineering, greatly extending the device lifetime.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Review
Chemistry, Multidisciplinary
Lian Wang, Bohong Chang, Hui Li, Yutong Wu, Zhen Liu, Lu Pan, Longwei Yin
Summary: The lattice structure and composition of perovskites significantly affect their stability. [PbX6] (4-) octahedra and organic spacers play crucial roles in stabilizing the perovskite structure. Various strategies involving octahedral modulation and organic spacer construction have been developed to enhance the stability of perovskites. Key scientific issues and future directions are discussed to further improve the stability of perovskite solar cells.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Saikiran Khamgaonkar, Qiaoyun Chen, Kevin Musselman, Vivek Maheshwari
Summary: Organolead halide perovskite photocathodes have shown great potential for photoelectrochemical hydrogen evolution, but their poor stability in aqueous environment and low HER performance in alkaline conditions have limited their practical application. In this study, highly efficient and stable polymer-integrated perovskite photocathodes are fabricated and coupled with Au-Pt-Ni bimetallic catalyst, resulting in improved hydrogen evolution performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Haian Qiu, Jeffrey M. Mativetsky
Summary: The study reveals localized nonlinear lattice deformation and nanoscale structural rearrangement in methylammonium lead triiodide films caused by the combined action of light and voltage. These effects are connected with organic cation motion, suggesting that localized cation migration plays a significant role in the instability of perovskite optoelectronic devices under operating conditions.
Article
Chemistry, Physical
Min-cheol Kim, Namyoung Ahn, Diyi Cheng, Mingjie Xu, So-Yeon Ham, Xiaoqing Pan, Suk Jun Kim, Yanqi Luo, David P. Fenning, Darren H. S. Tan, Minghao Zhang, Guomin Zhu, Kiwan Jeong, Mansoo Choi, Ying Shirley Meng
Summary: Perovskite solar cells have achieved world-record-setting photovoltaic performances, but their practicality is limited by structural instability caused by ion migration and defect formation. Researchers have developed a new method to observe real-time changes in the structure and found that heating the samples can effectively restore performance losses.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Alexander S. Bieber, Colette M. Sullivan, Katherine E. Shulenberger, Gregory Moller, Masoud Mardani, Sarah Wieghold, Theo Siegrist, Lea Nienhaus
Summary: This article investigates the effects of heat and light on the triplet generation process at the perovskite/rubrene interface. Exposure to these stressors resulted in local discrepancies across the upconversion device. Changes in morphology, degradation of organic layers, and reduction in triplet generation were observed in the first region, while no morphology changes and visible upconverted emission were observed in the second region. Transient absorption spectroscopy confirmed successful triplet generation even at elevated temperatures. This work emphasizes the challenges and potential of integrating perovskite-sensitized upconversion into commercial photovoltaic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Chemistry, Physical
Fanghao Ye, Qingsong Shan, Haibo Zeng, Wallace C. H. Choy
Summary: This review analyzes the stability issues of PeLEDs, describes research progress in improving operational stability through defect passivation, charge balance, and thermal management, and discusses future directions for achieving high-performing and stable PeLEDs.
ACS ENERGY LETTERS
(2021)