Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cells
Rafael S. Sanchez a, Elena Mas-Marzá a
nanoGe Perovskite Conferences
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV16)
Barcelona, Spain, 2016 March 3rd - 4th
Organizers: Emilio Palomares and Nam-Gyu Park
Poster, Elena Mas-Marzá, 024
Publication date: 14th December 2015

Perovskite (PS) solar cells have emerged as a promising technology for low-cost and efficient photovoltaics.1 However, the main limiting factors relay on their low long-term stability. The loss of performance of these devices is commonly attributed to degradation of the PS itself.2 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 could be 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.

http://www.nrel.gov/ncpv/images/efficiency_chart.jpg

2 G. Niu, X. Guo, L. Wang, Journal of Materials Chemistry A, 3 (2015) 8970-8980. J. Yang, B.D. Siempelkamp, D. Liu, T.L. Kelly Acs Nano, 9 (2015) 1955-1963. Y. Han, S. Meyer, Y. Dkhissi, K. Weber, J.M. Pringle, U. Bach, L. Spiccia, Y.-B. Cheng Journal of Materials Chemistry A, 3 (2015) 8139-8147. 



© FUNDACIO DE LA COMUNITAT VALENCIANA SCITO
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info