High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

Dong Yang (), Ruixia Yang, Kai Wang, Congcong Wu, Xuejie Zhu, Jiangshan Feng, Xiaodong Ren, Guojia Fang, Shashank Priya () and Shengzhong (Frank) Liu ()
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Dong Yang: Shaanxi Normal University
Ruixia Yang: Shaanxi Normal University
Kai Wang: Center for Energy Harvesting Materials and System (CEHMS), Virginia Tech
Congcong Wu: Center for Energy Harvesting Materials and System (CEHMS), Virginia Tech
Xuejie Zhu: Shaanxi Normal University
Jiangshan Feng: Shaanxi Normal University
Xiaodong Ren: Shaanxi Normal University
Guojia Fang: Wuhan University
Shashank Priya: Center for Energy Harvesting Materials and System (CEHMS), Virginia Tech
Shengzhong (Frank) Liu: Shaanxi Normal University

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract Even though the mesoporous-type perovskite solar cell (PSC) is known for high efficiency, its planar-type counterpart exhibits lower efficiency and hysteretic response. Herein, we report success in suppressing hysteresis and record efficiency for planar-type devices using EDTA-complexed tin oxide (SnO2) electron-transport layer. The Fermi level of EDTA-complexed SnO2 is better matched with the conduction band of perovskite, leading to high open-circuit voltage. Its electron mobility is about three times larger than that of the SnO2. The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO2 increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO2 enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO2 degrade only by 8% exposed in an ambient atmosphere after 2880 h, and only by 14% after 120 h under irradiation at 100 mW cm−2.

Date: 2018
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DOI: 10.1038/s41467-018-05760-x

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