期刊
ADVANCED MATERIALS
卷 31, 期 36, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201902870
关键词
dynamic-strain-based scanning probe microscopy; hysteresis; ionic migration; spontaneous polarization; triple-cation mixed-halide perovskites
类别
资金
- National Key Research and Development Program of China [2016YFA0201001]
- National Natural Science Foundation of China [11621062, 11772207, 11627801, 11790282]
- Shenzhen Peacock Team Program [KQTD20170810160424889]
- Shenzhen Science and Technology Innovation Committee [JCYJ20170307165905513, JCYJ20170818155813437]
- Instrument Developing Project of Chinese Academy of Sciences [ZDKYYQ20180004]
- Natural Science Foundation of Guangdong Province [2017A030313342]
- High Level Talent Support Project in Hebei [A2017002034, C201821]
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics [MCMS-E-0519G04]
- Open Fund of State Key Laboratory of Metastable Materials Science and Technology [201919]
Triple-cation mixed-halide perovskites of composition Cs-x(FA(y)MA(1-y))(1-x)Pb(IzBr1-z)(3) (CsFAMA) have been reported to possess excellent photovoltaic efficiency with minimal hysteresis; in this work, nanoscale insight is shed into the roles of illumination-induced polarization and ionic migration in photovoltaic hysteresis. By examining the concurrent evolution of ionic distribution and spontaneous polarization of CsFAMA under light illumination using dynamic-strain-based scanning probe microscopy, strong linear piezoelectricity arising from photoenhanced polarization is observed, while ionic migration is found to be not significantly increased by lightening. Nanoscale photocurrents are mapped under a series of biases using conductive atomic force microscopy, revealing negligible difference between forward and backward scans, and local IV curves reconstructed from principal component analysis show minimal hysteresis of just 1%. These observations at the nanoscale are confirmed in a macroscopic perovskite solar cell made of CsFAMA, exhibiting a high efficiency of 20.11% and with hysteresis index as small as 3%. Ionic migration, polarization, and photocurrent hysteresis are thus directly correlated at the nanoscale, and photoenhanced polarization in triple-cation mixed-halide perovskites is established, which does not contribute to the photovoltaic hysteresis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据