Tuning CH 3 NH 3 Pb(I 1-x Br x ) 3 Perovskite Oxygen Stability in Thin Films and Solar Cells

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Title: Tuning CH 3 NH 3 Pb(I 1-x Br x ) 3 Perovskite Oxygen Stability in Thin Films and Solar Cells
Author(s): Pont, S
Bryant, D
Lin, CH
Aristidou, N
Wheeler, S
Ma, X
Godin, R
Haque, S
Durrant, JR
Item Type: Journal Article
Abstract: The rapid development of organic–inorganic lead halide perovskites has resulted in high efficiency photovoltaic devices. However the susceptibility of these devices to degradation under environmental stress has so far hindered commercial development, requiring for example expensive device encapsulation. Herein, we have investigated the stability of CH3NH3Pb(I1−xBrx)3 [x = 0–1] thin films and solar cells under controlled humidity, light, and oxygen conditions. We show that higher bromide ratios increase tolerance to moisture, with x = 1 thin films being stable to 120 h of moisture stress. Under light and dry air, partial bromide (x < 1) substitution does not enhance film stability significantly, with the corresponding solar cells degrading within two hours. In contrast, CH3NH3PbBr3 films show excellent stability, with device stability being limited by the organic interlayer. For these x = 1 films, we show that charge carriers are quenched in the presence of oxygen and form superoxide; however in contrast to perovskites containing iodide, this superoxide does not degrade the crystal. Our observations show that iodide limits the oxygen and light stability of CH3NH3Pb(I1−xBrx)3 perovskites, but that CH3NH3PbBr3 provides an opportunity to develop inherently stable high voltage photovoltaic devices and 4-terminal tandem solar cells.
Publication Date: 17-Mar-2017
Date of Acceptance: 17-Mar-2017
URI: http://hdl.handle.net/10044/1/49212
DOI: https://dx.doi.org/10.1039/C7TA00058H
ISSN: 2050-7488
Publisher: Royal Society of Chemistry
Journal / Book Title: Journal of Materials Chemistry A
Volume: 5
Issue: 20
Copyright Statement: © 2017 The Royal Society of Chemistry
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Materials Science
Publication Status: Published
Embargo Date: 2018-03-17
Appears in Collections:Materials
Faculty of Natural Sciences

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