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High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2.
- Source :
- Nature Communications; 8/13/2018, Vol. 9 Issue 1, p1-1, 1p
- Publication Year :
- 2018
-
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 (SnO<subscript>2</subscript>) electron-transport layer. The Fermi level of EDTA-complexed SnO<subscript>2</subscript> 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<subscript>2</subscript>. The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO<subscript>2</subscript> increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO<subscript>2</subscript> enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO<subscript>2</subscript> 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<superscript>−2</superscript>. 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 9
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 131219536
- Full Text :
- https://doi.org/10.1038/s41467-018-05760-x