Modified two-step deposition method for high-efficiency TiO2/CH3NH3PbI3 heterojunction solar cells.
Hybrid organic-inorganic perovskites (e.g., CH3NH3PbI3) are promising light absorbers for the third-generation photovoltaics. Herein we demonstrate a modified two-step deposition method to fabricate a uniform CH3NH3PbI3 capping layer with high-coverage and thickness of 300 nm on top of the mesoporous TiO2. The CH3NH3PbI3 layer shows high light-harvesting efficiency and long carrier lifetime over 50 ns. On the basis of the as-prepared film, TiO2/CH3NH3PbI3 heterojunction solar cells achieve a power conversion efficiency of 10.47% with a high open-circuit voltage of 948 mV, the highest recorded to date for hole-transport-material-free (HTM-free) perovskite-based heterojunction cells. The efficiency exceeding 10% shows promising prospects for the HTM-free solar cells based on organic lead halides.
Key Laboratory for Renewable Energy and Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, P. R. China.
Jiangjian
J
Shi
Yanhong
Y
Luo
Huiyun
H
Wei
Jianheng
J
Luo
Juan
J
Dong
Songtao
S
Lv
Junyan
J
Xiao
Yuzhuan
Y
Xu
Lifeng
L
Zhu
Xin
X
Xu
Huijue
H
Wu
Dongmei
D
Li
Qingbo
Q
Meng