Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Publication date: 11th December 2017
In the field of photovoltaics, the recent concept of perovskite solar cells have attracted great interest due to their high efficiency combined with a potential low cost and good versatility. The main remaining challenge now concerns their intrinsic stability. There is a vital need for a better understanding of the degradation mechanisms and thereby the plausible mitigation strategies.
The presented work focuses on perovskite solar cell with architectures specifically optimized for large scale flexible production. The planar NIP architecture uses aluminum doped zinc oxide (AZO) as the N layer, a chlorine doped MAPI as active perovskite material, and regular P3HT as P layer. AZO presents the advantage of having a low processing temperature (<150°C) enabling its use with flexible substrates and P3HT is available at large scale. In addition, P3HT acts as a barrier material and delays the degradation of the perovskite (1). The studied perovskite material is a Cl doped MAPbI3 system. This system has been described in details (2), and may lead to high efficiency. Nevertheless the exact composition of the perovskite material can have a strong impact on the performance durability. We propose to thoroughly study this system and its changes over time with temperature, illumination, and electrical stress.
In presented work, we will unravel the occurring degradation processes with a broad range of characterization methods. Thanks to chemical and microstructural characterizations such as infrared spectroscopy, Raman spectroscopy and microscopy, XRD, some markers of degradation (PbI2, PbCl2…) and of the different perovskite phases (MAPbI3, MAPbCl3) have been determined and these latter allow to follow the chemical composition of the perovskite material and eventually its degradation during aging. Combining the Raman and optical microscopy, it is possible to study the degradation gradient. Correlating these results with UV-visible absorption, photoluminescence spectroscopy and photovoltaic characteristics enables to track the degradation processes, and their impact on performances. Using this procedure for variable aging conditions (temperature, illumination and combination of them) now allows to understand the effect of each degradation parameter on the performances of the cell and provides a path for improvement of the device intrinsic stability.
References
1. Idigoras, J., et al. s.l. : Royal Society of Chemistry (RSC), 2016, Phys. Chem. Chem. Phys., Vol. 18, pp. 13583-13590.
2. Quilettes, Dane W., et al. s.l. : American Association for the Advancement of Science, 2015, Science, Vol. 348, pp. 683-686. ISSN: 0036-8075.
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