Issue 67, 2017, Issue in Progress

Enhanced efficiency and stability of inverted perovskite solar cells by interfacial engineering with alkyl bisphosphonic molecules

Abstract

The moisture instability of perovskite materials especially under illumination has engendered severe hindrance toward future industrial applications for high-efficiency and stable perovskite solar cells. Here, we designed and synthesized a series of hydrophobic alkyl bisphosphonic molecules which served as interfacial layers between a perovskite and PC61BM to improve the moisture and light-stability of the inverted PVSCs. The steric arrangement of the bisphosphonic molecules suppressed the infiltration of moisture and oxygen inside the perovskite film under humidity and continuous illumination, and decreased the loss of halide and methylammonium ions as revealed by the lower PbI2 and Pb0 in the film. When exposed to 50–60% RH and continuous AM1.5G illumination, devices after undergoing interfacial treatment retained 70% of the initial power conversion efficiency, while the control device totally failed, suggesting markedly improved moisture and light-stability by the interfacial engineering. Moreover, the treated devices showed almost no degradation after being stored in an ambient atmosphere for 300 h.

Graphical abstract: Enhanced efficiency and stability of inverted perovskite solar cells by interfacial engineering with alkyl bisphosphonic molecules

Supplementary files

Article information

Article type
Paper
Submitted
08 Jul 2017
Accepted
24 Aug 2017
First published
29 Aug 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 42105-42112

Enhanced efficiency and stability of inverted perovskite solar cells by interfacial engineering with alkyl bisphosphonic molecules

N. Li, C. Cheng, H. Wei, H. Liu, X. Li, W. Li and L. Wang, RSC Adv., 2017, 7, 42105 DOI: 10.1039/C7RA07514F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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