TY - JOUR
T1 - Aligned and Graded Type-II Ruddlesden–Popper Perovskite Films for Efficient Solar Cells
AU - Qing, Jian
AU - Liu, Xiao Ke
AU - Li, Mingjie
AU - Liu, Feng
AU - Yuan, Zhongcheng
AU - Tiukalova, Elizaveta
AU - Yan, Zhibo
AU - Duchamp, Martial
AU - Chen, Shi
AU - Wang, Yuming
AU - Bai, Sai
AU - Liu, Jun Ming
AU - Snaith, Henry J.
AU - Lee, Chun Sing
AU - Sum, Tze Chien
AU - Gao, Feng
N1 - Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/7/25
Y1 - 2018/7/25
N2 - 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.
AB - 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.
KW - 2D
KW - additives
KW - charge separation
KW - layered perovskite
KW - solar cells
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U2 - 10.1002/aenm.201800185
DO - 10.1002/aenm.201800185
M3 - Article
AN - SCOPUS:85046541287
SN - 1614-6832
VL - 8
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 21
M1 - 1800185
ER -
