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Aligned and Graded Type‐II Ruddlesden–Popper Perovskite Films for Efficient Solar Cells
Author(s) -
Qing Jian,
Liu XiaoKe,
Li Mingjie,
Liu Feng,
Yuan Zhongcheng,
Tiukalova Elizaveta,
Yan Zhibo,
Duchamp Martial,
Chen Shi,
Wang Yuming,
Bai Sai,
Liu JunMing,
Snaith Henry J.,
Lee ChunSing,
Sum Tze Chien,
Gao Feng
Publication year - 2018
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.201800185
Subject(s) - materials science , perovskite (structure) , crystallinity , energy conversion efficiency , fabrication , photovoltaic system , hysteresis , band gap , perovskite solar cell , chemical engineering , nanotechnology , solar cell , optoelectronics , condensed matter physics , composite material , ecology , physics , engineering , biology , medicine , alternative medicine , pathology
Recently, Ruddlesden–Popper perovskites (RPPs) have attracted increasing interests due to their promising stability. However, the efficiency of solar cells based on RPPs is much lower than that based on 3D perovskites, mainly attributed to their poor charge transport. Herein, a simple yet universal method for controlling the quality of RPP films by a synergistic effect of two additives in the precursor solution is presented. RPP films achieved by this method show (a) high quality with uniform morphology, enhanced crystallinity, and reduced density of sub‐bandgap states, (b) vertically oriented perovskite frameworks that facilitate efficient charge transport, and (c) type‐II band alignment that favors self‐driven charge separation. Consequently, a hysteresis‐free RPP solar cell with a power conversion efficiency exceeding 12%, which is much higher than that of the control device (1.5%), is achieved. The findings will spur new developments in the fabrication of high‐quality, aligned, and graded RPP films essential for realizing efficient and stable perovskite solar cells.