Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cells
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Title
Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cellsDate
2016Publisher
ElsevierISSN
0927-0248; 1879-3398Type
info:eu-repo/semantics/articlePublisher version
http://www.sciencedirect.com/science/article/pii/S0927024816001264Version
info:eu-repo/semantics/submittedVersionSubject
Abstract
Perovskite (PS) solar cells have emerged as a promising technology for low-cost and efficient photovoltaics.
However, the main limiting factors are related to their low long-term stability. The loss of
performance ... [+]
Perovskite (PS) solar cells have emerged as a promising technology for low-cost and efficient photovoltaics.
However, the main limiting factors are related to their low long-term stability. The loss of
performance of these devices is commonly attributed to degradation of the PS itself. In order to further
explore the origins of such limited stability, we have developed UV–vis spectroscopy studies that clearly
demonstrate that PS layers remain unalterable under the working conditions. On the contrary, significant
variations in the absorption spectra of the Spiro-OMeTAD layer (Spiro), a commonly used hole transporting
material (HTM), indicate that the loss of performance over the irradiation time are attributed to
the degradation of Spiro. UV–vis measurements evidence a photo-induced oxidation of Spiro, both under
air and inert atmosphere. This photo-oxidation is accelerated by the commonly employed additives of
the Spiro (LiTFSI and tBP), as well as by the interfacial contact with the electron injecting layer (TiO2).
Therefore, our results point to the Spiro degradation as the main mechanism that induces the limited
functioning of the PS solar cells. Consequently, focusing on the development of alternative HTMs stable
under the working conditions is one of the critical issues to be overcome for a suitable progress of PS
solar cells and related opto-electronic devices. [-]
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Solar Energy Materials & Solar Cells 158 (2016) 189–194Rights
© 2016 Elsevier B.V. All rights reserved.
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