Article
Chemistry, Multidisciplinary
Ke Meng, Xiao Wang, Zhimin Li, Zhou Liu, Zhi Qiao, Chunwu Wang, Youdi Hu, Shunde Li, Lei Cheng, Yufeng Zhai, Gang Chen
Summary: This study presents an effective self-passivation strategy to enhance the efficiency and stability of BA-based LDP solar cells. The unique crystal stacking pattern of the BA-based LDP film containing highly oriented perovskite crystals of different layer thicknesses is revealed.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Mohamed Saber Lassoued, Yuan-Chao Pang, Qian-Wen Li, Xinkai Ding, Bo Jiao, Hua Dong, Guijiang Zhou, Shujiang Ding, Zhicheng Zhang, Zhaoxin Wu, Gaoyang Gou, Zongyou Yin, Ju Li, Yan-Zhen Zheng
Summary: The study introduces two new semiconducting 2D organic-inorganic hybrid materials with broadband yellow-green emission and strong photocurrent responses. These materials exhibit high photocurrent difference between light and dark conditions, making them among the highest current obtained in 2D lead iodide hybrid materials. Additionally, the materials are stable under various conditions, making them promising for realistic applications in light detection.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Kwan Ho Ngai, Xinwen Sun, Yinping Wang, Long Lin, Zefeng Chen, Qi Wei, Mingjie Li, Chuhao Luan, Wenjun Zhang, Jianbin Xu, Mingzhu Long
Summary: The precise engineering of monovalent cations in perovskite materials has led to significant improvements in performance and stability for perovskite light-emitting diodes (PeLEDs). However, the specific role of A-site cations in the electroluminescence (EL) performance and degradation mechanism of PeLEDs remains unclear. This study shows that the commonly used methylammonium cation (MA(+)) has a negative effect on the electrochemical reaction at the perovskite-metal oxide interface, resulting in deteriorated EL performance compared to formamidinium cation (FA(+))-based perovskite. Furthermore, the addition of inorganic cesium cation (Cs+) in a small amount of FA(+) improves crystallinity and crystal size, leading to an optimized peak external quantum efficiency of 21.3% and enhanced stability in PeLEDs.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ulrich Johannes Bahnmueller, Yasar Krysiak, Sonja Locmelis, Sebastian Polarz
Summary: Shape-controlled methylammonium lead bromide microcrystals are used to study the reactivity of hybrid perovskite semiconductors. The results show that different facets have different sensitivities and stabilities, which provides valuable insights for the design and optimization of hybrid perovskite materials.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Zhenyu Guo, Yu Zhang, Bingzhe Wang, Liding Wang, Ning Zhou, Zhiwen Qiu, Nengxu Li, Yihua Chen, Cheng Zhu, Haipeng Xie, Tinglu Song, Lei Song, Haibo Xue, Shuxia Tao, Qi Chen, Guichuan Xing, Lixin Xiao, Zhiwei Liu, Huanping Zhou
Summary: By manipulating the crystallization kinetics of different-n phases, a more efficient energy transfer in Q-2D perovskites is achieved, leading to highly efficient green LEDs.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yanqiang Hu, Lijuan Cai, Zong Xu, Zhi Wang, Yifan Zhou, Guangping Sun, Tongming Sun, Yabing Qi, Shufang Zhang, Yanfeng Tang
Summary: By introducing potassium anthraquinone-1,8-disulfonate (DAD) in the precursor solution, we achieved an optimized CsPbI2Br perovskite solar cell with a champion efficiency of 17.38% and a record fill factor of 83.6%. The synergistic effect between the electronegative functional groups and K+ ions in the DAD structure improved the crystalline quality and stability of CsPbI2Br and enhanced carrier transport properties. The efficiency of the corresponding large-area device reached 13.20% and exhibited negligible hysteresis and enhanced long-term storage stability as well as thermal stability.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Congcong Chen, Xin Zhao, Yaping Gong, Yang Liu, Zhongwei Chen, Luming Zhang, Jian Chen, Zeyu Deng, Haipeng Lu, Min Luo, Pieremanuele Canepa, Lingling Mao
Summary: This study reports a new family of hybrid 2D Ge-based perovskites with excellent optical properties and structural diversity. The Ge-based iodide perovskites exhibit good second-harmonic generation (SHG) responses, providing new strategies for the design of lead-free alternatives.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kang Wang, Linrui Jin, Yao Gao, Aihui Liang, Blake P. Finkenauer, Wenchao Zhao, Zitang Wei, Chenhui Zhu, Tzung-Fang Guo, Libai Huang, Letian Dou
Summary: Researchers have developed an efficient and stable LED device using organic semiconductor barrier layers, which enable the conversion of emission energy from the organic layer into higher energy emission from the perovskite layer, leading to improved device performance and stability.
Article
Chemistry, Physical
Yuhang Liang, Xiangyuan Cui, Feng Li, Catherine Stampfl, Simon P. Ringer, Xudong Yang, Jun Huang, Rongkun Zheng
Summary: Oxygen ingression has been shown to decrease the carrier lifetime of Sn-based perovskites, but the mechanism behind this is unknown. First-principles calculations reveal that oxygen forms substitutional O-I by combining with native I vacancies (V-I), significantly increasing the recombination rate of V-I. This explains the sharp decline of carrier lifetime in perovskites exposed to air. These insights offer a way to improve device performance in Sn-based perovskite optoelectronics operating in ambient air through anion engineering.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Yuhang Liang, Xiangyuan Cui, Feng Li, Catherine Stampfl, Simon P. Ringer, Xudong Yang, Jun Huang, Rongkun Zheng
Summary: Oxygen ingression has been shown to decrease the carrier lifetime of Sn-based perovskites, and our calculations reveal that oxygen tends to form substitutional OI, which remarkably increases the recombination rate of native I vacancies (VI). This explains the observed decline of carrier lifetime in perovskites exposed to air. The enhanced carrier recombination is due to a smaller electron capture barrier of OI, resulting from lattice strengthening and suppressed structural relaxation upon electron capture. These insights offer a route to improve device performance in Sn-based perovskite optoelectronics operating in ambient air.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Alexandra A. Koegel, Iain W. H. Oswald, Chuy Rivera, Samantha L. Miller, M. Jewels Fallon, Timothy R. Prisk, Craig M. Brown, James R. Neilson
Summary: The layered Ruddlesden-Popper derivatives of CH3NH3PbI3 have shown promising potential as stable materials for photovoltaics. The rotational dynamics of the organic cations in these materials influence their optoelectronic properties. This study investigates the influence of cation dynamics on properties in the layered derivatives and provides insights into the relationship between the dimensionality of the inorganic layer and the rotational dynamics of the organic cations.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Mingyang Li, Jiawei Lin, Kunjie Liu, Liubing Fan, Na Wang, Zhongnan Guo, Wenxia Yuan, Jing Zhao, Quanlin Liu
Summary: In this study, a new zero-dimensional organic-inorganic metal halide (C3H12N2)2Sb2Cl10 with good optical and thermal stability was reported. The material exhibits a broad emission under 395 nm excitation, mainly attributed to self-trapped exciton emission.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Ji Jiang, Zema Chu, Zhigang Yin, Jingzhen Li, Yingguo Yang, Jingren Chen, Jinliang Wu, Jingbi You, Xingwang Zhang
Summary: Efficient red PeLEDs with high EQE and maximum brightness have been achieved by finely controlling the phase distribution of quasi-2D perovskite and passivation of defects in perovskite films.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Tingting Zhu, Kun Zhang, Chengmin Ji, Xinyuan Zhang, Huang Ye, Yuanchen Zou, Junhua Luo
Summary: Multilayered chiral hybrid perovskites, designed through pairing achiral and chiral compounds in the interlayer space, exhibit high sensitivity for circularly polarized light (CPL) detection.
Article
Chemistry, Physical
Ping Fu, Michael A. Quintero, Claire Welton, Xiaotong Li, Bruno Cucco, Michael C. De Siena, Jacky Even, George Volonakis, Mikael Kepenekian, Runze Liu, Craig C. Laing, Vladislav Klepov, Yukun Liu, Vinayak P. Dravid, G. N. Manjunatha Reddy, Can Li, Mercouri G. Kanatzidis
Summary: In this paper, two-dimensional lead bromide perovskites and one-dimensional compounds based on short aromatic diammonium cations are reported, and their white-light emission is studied. The results indicate that the distortion of the Pb octahedra is influenced by the stereochemistry of the cations and their interactions with the perovskite layers.
CHEMISTRY OF MATERIALS
(2022)
Article
Multidisciplinary Sciences
Meenakshi Upadhyaya, Connor J. Boyle, Dhandapani Venkataraman, Zlatan Aksamija
SCIENTIFIC REPORTS
(2019)
Article
Nanoscience & Nanotechnology
Timothy S. Gehan, Christie L. C. Ellis, Dhandapani Venkataraman, Monojit Bag
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Biophysics
Mike Woodward, Eric Ostrander, Seung P. Jeong, Xiarong Liu, Brent Scott, Matt Unger, Jianhan Chen, Dhandapani Venkataraman, Edward P. Debold
BIOPHYSICAL JOURNAL
(2020)
Article
Chemistry, Physical
Hamza Javaid, Volodimyr V. Duzhko, D. Venkataraman
Summary: Utilizing a hole transport bilayer of PTAA and CuI leads to efficient and stable inverted perovskite solar cells with improved crystallinity and grain size. Enhanced built-in potential at the CuI interface contributes to the performance enhancement of the devices, which also exhibit minimal hysteresis and stable current output.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jacob Stanley-Gray, Zhaojie Zhang, D. Venkataraman
Summary: The updated version of the coordination geometry table for d-block elements and their ions is based on data from the Cambridge Structural Database and includes analysis of ligand effects. The interactive table can be accessed and downloaded from http://cgt.dvgroup.umasscreate.net.
JOURNAL OF CHEMICAL EDUCATION
(2021)
Article
Chemistry, Multidisciplinary
Meenakshi Upadhyaya, Michael Lu-Diaz, Subhayan Samanta, Muhammad Abdullah, Keith Dusoe, Kevin R. Kittilstved, Dhandapani Venkataraman, Zlatan Aksamija
Summary: The authors found that dopant-induced disorder negatively impacts the charge transport properties of semiconducting polymers, but increasing the dielectric permittivity of the polymer can mitigate this effect. They experimentally verified that this method significantly improves conductivity and Seebeck coefficient in iodine-doped P3HT and P3HT blended with barium titanate nanoparticles, resulting in a fourfold increase in power factor.
Article
Chemistry, Multidisciplinary
Emily Smith, D. Venkataraman
Summary: This study focuses on the application of CuI as a hole-transport layer in a p-i-n perovskite photovoltaic architecture. By investigating the impact of different components in the perovskite precursor solution on the integrity of CuI films, it is found that DMSO, mixtures of gamma-butyrolactone:DMSO, and DMF:DMSO, as well as iodide ions, can dissolve the CuI layer. Furthermore, by coating a layer of copper(II) acetate and utilizing the known Cu(II)/Cu(I) redox chemistry with iodide ions, CuI can be preserved in the presence of halide salts and solvents.
Article
Chemistry, Physical
Hamza Javaid, Nicholas Heller, Volodimyr V. Duzhko, Nicholas Hight-Huf, Michael D. Barnes, D. Venkataraman
Summary: Replacing PEDOT:PSS with CuBr as a hole transport layer can enhance the efficiency and stability of inverted perovskite solar cells. CuBr exhibits a larger built-in potential and favorable valence band alignment, and also shows good long-term stability in inert and humid environments.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Energy & Fuels
A. P. Ravikumar, E. Baker, A. Bates, D. Nock, D. Venkataraman, T. Johnson, M. Ash, S. Z. Attari, K. Bowie, S. Carley, S. Castellanos, M. Cha, D. L. Clark, D. Deane-Ryan, D. Djokic, J. C. Ford, A. Goldstein, E. Grubert, L. Hu, D. M. Kammen, U. Kosar, C. Miller, M. Pastor, M. Tuominen
Summary: Ensuring comprehensive and meaningful inclusion of marginalized communities in research institutions is crucial for achieving an equitable, technology-driven clean energy transition. We provide five key action items for government agencies and philanthropic institutions to implement their commitment to equity in energy transition.
Meeting Abstract
Biophysics
Mike Woodward, Eric Ostrander, Xiaorong Liu, Seung Pyo Jeong, Jianhan Chen, Dhandapani Venkataraman, Edward P. Debold
BIOPHYSICAL JOURNAL
(2020)
Correction
Chemistry, Physical
Emily C. Smith, Christie L. C. Ellis, Hamza Javaid, Blaise G. Arden, D. Venkataraman
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)
Article
Chemistry, Physical
Emily C. Smith, Christie L. C. Ellis, Hamza Javaid, Blaise G. Arden, D. Venkataraman
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)