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Title: Aligned and graded type‐II Ruddlesden – Popper perovskite films for efficient solar cells
Authors: Qing, Jian
Liu, Xiao-Ke
Li, Mingjie
Liu, Feng
Yuan, Zhongcheng
Tiukalova, Elizaveta
Yan, Zhibo
Duchamp, Martial
Chen, Shi
Wang, Yuming
Bai, Sai
Liu, Jun-Ming
Snaith, Henry J.
Lee, Chun-Sing
Sum, Tze Chien
Gao, Feng
Keywords: Science::Physics
Issue Date: 2018
Source: Qing, J., Liu, X.-K., Li, M., Liu, F., Yuan, Z., Tiukalova, E., . . . Gao, F. (2018). Aligned and graded type‐II Ruddlesden – Popper perovskite films for efficient solar cells. Advanced Energy Materials, 8(21), 1800185-. doi:10.1002/aenm.201800185
Journal: Advanced Energy Materials
Abstract: 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.
ISSN: 1614-6832
DOI: 10.1002/aenm.201800185
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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