Light-Independent Ionic Transport in Inorganic Perovskite and Ultrastable Cs-Based Perovskite Solar Cells

Zhou, Wenke1,2; Zhao, Yicheng1,2; Zhou, Xu1,2,4; Fu, Rui1,2; Li, Qi1,2; Zhao, Yao1,2; Liu, Kaihui1,2,3; Yu, Dapeng1,2,5,6; Zhao, Qing1,2,3

2017-09-07

10.1021/acs.jpclett.7b01851

Journal of Physical Chemistry Letters   影响因子和分区

1948-7185

Due to light-induced effects in CH3NH3-based perovskites, such as ion migration, defects formation, and halide segregation, the degradation of CH3NH3-based perovskite solar cells under maximum power point is generally implicated. Here we demonstrated that the effect of light-enhanced ion migration in CH3NH3PbI3 can be eliminated by inorganic Cs substitution, leading to an ultrastable perovskite solar cell. Quantitatively, the ion migration barrier for CH3NH3PbI3 is 0.62 eV under dark conditions, larger than that of CsPbI2Br (0.45 eV); however, it reduces to 0.07 eV for CH3NH3PbI3 under illumination, smaller than that for CsPbI2Br (0.43 eV). Meanwhile, photoinduced halide segregation is also suppressed in Cs-based perovskites. Cs-based perovskite solar cells retained >99% of the initial efficiency (10.3%) after 1500 h of maximum power point tracking under AM1.5G illumination, while CH3NH3PbI3 solar cells degraded severely after 50 h of operation. Our work reveals an uncovered mechanism for stability improvement by inorganic cation substitution in perovskite-based optoelectronic devices.

SCI ; EI

英语

ESI高被引 ; NI期刊 ; ESI高被引 ; ESI高被引 ; ESI高被引 ; ESI高被引 ; ESI高被引 ; ESI高被引 ; ESI高被引 ; ESI高被引

其他

National Key Research and Development Program of China[2016YFA0300802] ; National Key Research and Development Program of China[2016YFA0300903]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Atomic, Molecular & Chemical

WOS:000410600600026

AMER CHEMICAL SOC

20173704156658

Bromine compounds ; Cesium compounds ; Ions ; Lead compounds ; Maximum power point trackers ; Optoelectronic devices ; Perovskite ; Solar cells

Minerals:482.2 ; Solar Cells:702.3 ; Electric Equipment:704.2 ; Optical Devices and Systems:741.3

Web of Science

1.Peking Univ, State Key Lab Mesoscop Phys, Sch Phys, Beijing 100871, Peoples R China
2.Peking Univ, Electron Microscopy Lab, Sch Phys, Beijing 100871, Peoples R China
3.Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China
4.Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China
5.South Univ Sci & Technol China SUSTech, Inst Quantum Sci & Technol, Shenzhen 518055, Peoples R China
6.South Univ Sci & Technol China SUSTech, Dept Phys, Shenzhen 518055, Peoples R China

Zhou, Wenke,Zhao, Yicheng,Zhou, Xu,et al. Light-Independent Ionic Transport in Inorganic Perovskite and Ultrastable Cs-Based Perovskite Solar Cells[J]. Journal of Physical Chemistry Letters,2017,8(17):4122-4128.

Zhou, Wenke.,Zhao, Yicheng.,Zhou, Xu.,Fu, Rui.,Li, Qi.,...&Zhao, Qing.(2017).Light-Independent Ionic Transport in Inorganic Perovskite and Ultrastable Cs-Based Perovskite Solar Cells.Journal of Physical Chemistry Letters,8(17),4122-4128.

Zhou, Wenke,et al."Light-Independent Ionic Transport in Inorganic Perovskite and Ultrastable Cs-Based Perovskite Solar Cells".Journal of Physical Chemistry Letters 8.17(2017):4122-4128.