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Architecturing 1D‐2D‐3D Multidimensional Coupled CsPbI 2 Br Perovskites toward Highly Effective and Stable Solar Cells
Author(s) -
Liu Kun,
Yuan Songyang,
Xian Yeming,
Long Yi,
Yao Qin,
Rahman Naveed Ur,
Guo Yang,
Sun Mingyuan,
Xue Qifan,
Yip HinLap,
Cabot Andreu,
Li Wenzhe,
Fan Jiandong
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202100888
Subject(s) - perovskite (structure) , heterojunction , materials science , thermal stability , solar cell , energy conversion efficiency , perovskite solar cell , nanotechnology , chemical engineering , chemical physics , optoelectronics , chemistry , crystallography , engineering
Despite the rapid development of CsPbI x Br 3− x (0 ≤ x ≤ 3) inorganic perovskite solar cells, associated with their superior thermal stability, their low moisture stability limits their commercial deployment. In this study, 1D‐2D‐3D multidimensional coupled perovskites are prepared by means of an in situ self‐integration approach. This pioneering method allows incorporating thus far unreported 1D‐Tpy 2 Pb 3 I 6 and 2D‐TpyPb 3 I 6 (Tpy; terpyridine) perovskites. Heterojunction perovskites demonstrate superior stability against water in comparison with control 3D CsPbI 2 Br, which is related to the hydrophobicity of low‐dimension (LD) perovskites. Remarkably, the spontaneous involvement of LD perovskites can adjust/reconstruct the interfacial structure. This modification allows releasing the residual strain, establishing effective charge transfer channels that increase the carrier transport ability. Accordingly, 1D‐2D‐3D hybrid CsPbI 2 Br perovskite solar cells demonstrate a stabilized power conversion efficiency as high as 16.1%, which represents a very significant improvement, by a factor of 43%, with respect to control 3D CsPbI 2 Br perovskite solar cell. Equally importantly, the multidimensional coupled perovskite solar cells exhibit extraordinary stability, well above 1000 h in ambient atmosphere.