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

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 (S...

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Bibliographic Details
Published in:Nature communications 2018-08, Vol.9 (1), p.1-11, Article 3239
Main Authors: Yang, Dong, Yang, Ruixia, Wang, Kai, Wu, Congcong, Zhu, Xuejie, Feng, Jiangshan, Ren, Xiaodong, Fang, Guojia, Priya, Shashank, Liu, Shengzhong (Frank)
Format: Article
Language:English
Subjects:
639/4077/909/4101/4096/946
639/766/1130/2799
Conduction
Conduction bands
Edetic acid
Efficiency
Electron mobility
Energy conversion efficiency
Ethylenediaminetetraacetic acids
Humanities and Social Sciences
Hysteresis
Irradiation
Low temperature
multidisciplinary
Open circuit voltage
Perovskites
Photovoltaic cells
Radiation
Science
Science (multidisciplinary)
Solar cells
Tin
Tin dioxide
Tin oxide
Tin oxides
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Summary: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 (SnO 2 ) electron-transport layer. The Fermi level of EDTA-complexed SnO 2 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 SnO 2 . The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO 2 increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO 2 enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO 2 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 . The development of high efficiency planar-type perovskite solar cell has been lagging behind the mesoporous-type counterpart. Here Yang et al. modify the oxide based electron transporting layer with organic acid and obtain planar-type cells with high certified efficiency of 21.5% and decent stability.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-018-05760-x