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Colorless to black switching with high contrast ratio via the electrochemical process of a hybrid organic-inorganic perovskite

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Carbon Energy 2023年第11期5卷 90-100页

作者： Ming Xu Jianmin Gu Zixun Fang Yu Li Xing Wang Xiaoyu Zhao Tifeng Jiao Wei Wang State Key Laboratory of Metastable Materials Science and Technology(MMST) Hebei Key Laboratory of Applied ChemistryYanshan UniversityQinhuangdaoChina Department of Food and Pharmaceutical Engineering Suihua UniversitySuihuaChina Department of Chemistry Centre for PharmacyUniversity of BergenBergenNorway

Colorless‐to‐black switching has attracted widespread attention for smart windows and multifunctional displays because they are more useful to control solar energy.However,it still remains a challenge owing to the tremendous difficulties in the design of completely reverse absorptions in transmissive and colored states.Herein,we report on an electrochemical device that can switch between colorless and black by using the electrochemical process of hybrid organic–inorganic perovskite MAPbBr_(3),which shows a high integrated contrast ratio of up to 73%from 400 to 800 nm.The perovskite solution can be used as the active layer to assemble the device,showing superior transmittance over the entire visible region in neutral states.By applying an appropriate voltage,the device undergoes reversible switching between colorless and black,which is attributed to the formation of lead and Br_(2)in the redox reaction induced by the electron transfer process in MAPbBr_(3).In addition,the contrast ratio can be modulated over the entire visible region by changing the concentration and the applied voltage.These results contribute toward gaining an insightful understanding of the electrochemical process of perovskites and greatly promoting the development of switchable devices.

关键词： colorless to black switching electrochemical process high integrated contrast ratio hybrid organic-inorganic perovskite switchable devices

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Efficient passivation of DY center in CH_(3)NH_(3)PbBr_(3) by chlorine:Quantum molecular dynamics

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Nano Research 2022年第3期15卷 2112-2122页

作者： Ran Shi Wei-Hai Fang Andrey S.Vasenko Run Long Oleg V.Prezhdo College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing 100875China National Research University Higher School of Economics(HSE)University 101000 MoscowRussia Donostia International Physics Center(DIPC) Paseo Manuel de Lardizabal 4San Sebastián/Donostia20018 Basque CountrySpain Department of Chemistry University of Southern CaliforniaLos AngelesCA 90089USA

MAPbBr_(3)(MA=CH_(3)NH_(3)^(+))doping with bismuth increases electric conductivity,charge carrier density and photostability,reduces toxicity,and expands light absorption.However,Bi doping shortens excited-state lifetimes due to formation of DY−charge recombination centers.Using nonadiabatic molecular dynamics and time-domain density functional theory,we demonstrate that the DY−center forms a deep,highly localized hole trap,which accelerates nonradiative relaxation ten-fold and is responsible for 90%of carrier losses.Hole trapping occurs by coupling between the valence band and the trap state,facilitated by the Br atoms surrounding the Bi dopant.Passivation of the DY−center with chlorines heals the local geometry distortion,eliminates the trap state,and makes the carrier lifetimes longer than even in pristine MAPbBr_(3).The decreased charge recombination arises from reduced nonadiabatic coupling and shortened coherence time,due to diminished electron–hole overlap around the passivated defect.Our study demonstrates accelerated nonradiative recombination in Bi-doped MAPbBr_(3),suggests a strategy for defect passivation and reduction of nonradiative energy losses,and provides atomistic insights into unusual defect properties of metal halide perovskites needed for rational design of high-performance perovskite solar cells and optoelectronic devices.

关键词： hybrid organic-inorganic perovskite DY−center and Cl passivation charge trapping and recombination nonadiabatic molecular dynamics time-domain density functional theory.

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Research progress on hybrid organic-inorganic perovskites for photo-applications

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Chinese Chemical Letters 2020年第12期31卷 3055-3064页

作者： Zengxi Wei Yuhang Zhao Jie Jiang Weibo Yan Yuezhan Feng Jianmin Ma Advanced Catalytic Engineering Research Center of the Ministry of Education School of Physics and ElectronicsHunan UniversityChangsha 410082China Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410082China Key Laboratory for organic Electronics and Information Displays&Institute of Advanced Materials(1AM) Nanjing University of Posts&TelecommunicationsNanjing 210023China Key Lxiboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China

hybrid organic-inorganic perovskite materials have attracted significant atte ntion of most re searchers in recently years,which is ascribed to the superior photoelectric properties,such as the suitable band gaps for harvesting sunlight,and exhibit high optical adsorption,high charge-carrier lifetimes and long diffusion lengths.The photodetectors,light-emitting diodes,solar cells and photocatalysts represent the remarkable applications for the hybrid organic-inorganic perovskite materials.Herein,we review the recent progress of hybrid organic-inorganic perovskite-based photodetectors,light-emitting diodes,solar cells and photocatalysts.The challenges and outlook for the hybrid organic-inorganic perovskitebased photodetectors,light-emitting diodes,solar cells and photocatalysts are considered.

关键词： hybrid organic-inorganic perovskite Photodetectors Light-emitting diodes Solar cells Photocatalysts

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CH3NH3Cd0.875Pb0.125I3 perovskite as potential photovoltaic materials

CH3NH3Cd0.875Pb0.125I3 perovskite as potential photovoltaic ...

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第四届新型太阳能电池学术研讨会

作者： Yuandi Zhang Jing Feng City College Kunming University of Science and Technology Faculty of Materials Science and Engineering Kunming University of Science and Technology

The band structure, electronic and optical properties of the perovskite CH

关键词： hybrid organic-inorganic perovskite solar cell first-principle calculation

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