Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
Hybrid lead halide perovskite solar cells (PSSCʹs) have emerged as one of the most promising and hottest topics in the photovoltaics field in the last few years, mainly due to the impressive evolution of the power conversion efficiency (PCE) achieved in a relatively short period of research.1 Despites these outstanding PCE values, the full understanding of the photo-physical/chemical mechanisms that participate during the charge generation and extraction, the exact origin of the J-V hysteresis, the slow dynamic processes observed, as well as the giant dielectric constant of the PSSCʹs at the low frequency region of the impedance spectra, constitute crucial questions to be elucidated. We have recently demonstrated that illuminating a PSSC induces irreversible modifications of the hole transport material broadly employed, i.e. photo-induced oxidation of Spiro-OMeTAD, which contribute significantly to the enhancement of the J-V hysteresis via charge accumulation.2 In the present work, we analyse the light-induced effects that suffer the PS films upon illumination and how these effects influence the performance of the devices including the high overall efficiency values and their relatively limited long-term stability.
1http://www.nrel.gov/ncpv/images/efficiency_chart.jpg2 R. S.Sanchez,
2E. Mas-Marza, Solar Energy Materials & Solar Cells 158(2016)189–194.
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