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Passivation of oxygen and light induced degradation by the PCBM electron transport layer in planar perovskite solar cells
File(s)
c8se00095f.pdf (1.31 MB)
Published version
Author(s)
Lin, Chieh
Pont, S
Kim, Jinhyun
Du, Tian
Xu, Shengda
Type
Journal Article
Abstract
Herein, we investigate the causes of a 20 fold improved stability of inverted, planar structure (ITO/PTAA/CH3NH3PbI3/PCBM/BCP/Cu) compared to conventional structure devices (FTO/compact-TiO2/meso-TiO2/CH3NH3PbI3/spiro-OMeTAD/Au) under oxygen and light stress. The PCBM layer is shown to function as an oxygen diffusion barrier and passivation layer against superoxide mediated degradation. The passivation properties of the PCBM layer are shown to depend on the electron affinity of fullerene acceptor, attributed to low LUMO level of PCBM energetically inhibiting superoxide generation. We also find the planar structure devices shows slower lateral oxygen diffusion rates than mesoporous scaffold devices, with these slower diffusion rates (days per 100 μm) also being a key factor in enhancing stability. Faster degradation is observed under voltage cycling, attributed to oxygen diffusion kinetics being ion motion dependent. We conclude by discussing the implications of these results for the design of perovskite solar cells with improved resistance to oxygen and light induced degradation.
Date Issued
2018-08-01
Date Acceptance
2018-03-23
Citation
Sustainable Energy and Fuels, 2018, 2 (8), pp.1686-1692
URI
DOI
ISSN
2398-4902
Publisher
Royal Society of Chemistry
Start Page
1686
End Page
1692
Journal / Book Title
Sustainable Energy and Fuels
Volume
2
Issue
8
Copyright Statement
© The Royal Society of Chemistry 2018. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/)
Sponsor
EPSRC
Grant Number
EP/L016702/1
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
STABILITY
FILMS
HYSTERESIS
PERFORMANCE
EFFICIENCY
DIFFUSION
BEHAVIOR
Publication Status
Published
Date Publish Online
2018-06-21