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In Situ Investigation of the Cu/CH 3 NH 3 PbI 3 Interface in Perovskite Device
Author(s) -
Ding Honghe,
Yan Kangrong,
Li Bairu,
Hu Wanpei,
Jia Lingbo,
Zareen Shah,
Freiberger Eva Marie,
Huang Jianmin,
Hu Jun,
Xu Qian,
Li Yu,
Yang Shangfeng,
Li Changzhi,
Ye Yifan,
Zhu Junfa
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202100120
Subject(s) - materials science , perovskite (structure) , x ray photoelectron spectroscopy , glovebox , perovskite solar cell , photoemission spectroscopy , band bending , solar cell , energy conversion efficiency , analytical chemistry (journal) , indium tin oxide , optoelectronics , nanotechnology , chemical engineering , crystallography , thin film , chemistry , organic chemistry , chromatography , engineering
In this study, the electronic properties and chemical stability of the Cu/CH 3 NH 3 PbI 3 interface are investigated in situ by a combination of X‐ray photoelectron spectroscopy and synchrotron radiation photoemission spectroscopy (SRPES). The morphology of Cu deposited perovskite surface is monitored by scanning electron microscopy. The results show that the Cu/CH 3 NH 3 PbI 3 interface is very stable and no chemical reaction between Cu and the perovskite takes place. Moreover, a 0.45 eV interface dipole and a 0.15 eV upward band bending are obtained at the Cu/CH 3 NH 3 PbI 3 interface. Based on these fundamental findings, a prototype of Cu/CH 3 NH 3 PbI 3 /NiO x /indium tin oxide solar cell device is constructed to check the power conversion efficiency (PCE) and device stability. Although no electron transport material is used in this device, it still exhibits decent performance. The PCE of the device reaches up to 9.99% and remains almost unchanged over a long‐time (49 d) storage in a N 2 ‐filled glovebox. Through this study it is demonstrated that fundamental understanding of the interfacial structure of a perovskite solar cell is essential in pursuit of rational design of superior perovskite solar cells, and moreover, Cu is a promising electrode candidate for perovskite solar cells.