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Spontaneously Self‐Assembly of a 2D/3D Heterostructure Enhances the Efficiency and Stability in Printed Perovskite Solar Cells
Author(s) -
Hu Jinlong,
Wang Chuan,
Qiu Shudi,
Zhao Yicheng,
Gu Ening,
Zeng Linxiang,
Yang Yuzhao,
Li Chaohui,
Liu Xianhu,
Forberich Karen,
Brabec Christoph J.,
Nazeeruddin Mohammad Khaja,
Mai Yaohua,
Guo Fei
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202000173
Subject(s) - materials science , heterojunction , triiodide , perovskite (structure) , optoelectronics , nanotechnology , solution process , fabrication , photocurrent , chemical engineering , dye sensitized solar cell , electrode , chemistry , medicine , engineering , alternative medicine , pathology , electrolyte
As perovskite solar cells (PSCs) are highly efficient, demonstration of high‐performance printed devices becomes important. 2D/3D heterostructures have recently emerged as an attractive way to relieving the film inhomogeneity and instability in perovskite devices. In this work, a 2D/3D ensemble with 2D perovskites self‐assembled atop 3D methylammonium lead triiodide (MAPbI 3 ) via a one‐step printing process is shown. A clean and flat interface is observed in the 2D/3D bilayer heterostructure for the first time. The 2D perovskite capping layer significantly suppresses nonradiative charge recombination, resulting in a marked increase in open‐circuit voltage ( V OC ) of the devices by up to 100 mV. An ultrahigh V OC of 1.20 V is achieved for MAPbI 3 PSCs, corresponding to 91% of the Shockley–Queisser limit. Moreover, notable enhancement in light, thermal, and moisture stability is obtained as a result of the protective barrier of the 2D perovskites. These results suggest a viable approach for scalable fabrication of highly efficient perovskite solar cells with enhanced environmental stability.