Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
Photovoltaic devices based on lead halide perovskites have drawn the attention of the scientific community due to the impressive power conversion efficiency evolution now reaching 21.6 %.1 So far one of the main limitations that have not allowed this technology to reach commercial applications is the low stability observed under operation conditions indicating that further work in this direction is needed. In this work we identify ion migration towards the interfaces followed by chemical reactivity with the contacts as one of the main degradation mechanisms. First, ion migration is monitored by means of electrical techniques such as cyclic voltammetry or Capacitive measurements.2,3 It is shown that the electrical properties of the ETL/perovskite interface is severely affected by ions accumulation and this is responsible for hysteresis behavior. In addition, chemical reactivity with the external contacts such as the reaction of iodide ions with the oxidized form of spiro-OMeTAD leads to a reduction of conductivity that can be regarded as an important degradation mechanism. In order to avoid chemical reactivity with the contacts it is shown that the introduction of a thin layer of Cr deposited between the external contact and the ETL can enhance the stability of perovskite devices.4
Acknowledgements
We thank financial support by MINECO of Spain under project (MAT2013-47192-C3-1-R) and Generalitad Valenciana for financial support on the DISOLAR2 Project (PROMETEOII/2014/020). Additionally, A. G. would like to thank the Spanish Ministerio de Economía y Competitividad for a Ramón y Cajal Fellowship (RYC-2014-16809).
References:
1.Saliba, M. et al. Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance. Science 2016. DOI:10.1126/science.aah5557
2.Carrillo, J.; Guerrero, A. et al. Ionic reactivity at contacts and aging of methylammonium lead triiodide perovskite solar cell Advanced Energy Materials 2016, 6 (9), 1502246.
3.Almora, O.; Guerrero, A.; et al. Ionic charging by local imbalance at interfaces in hybrid lead halide perovskites. Applied Physics Letters 2016, 108 (4), 043903.
4.Guerrero, A.; et al. Degradation of Planar Lead Halide Perovskite Solar Cells. ACS nano 2016, 10, 218–224.
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