Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Quantum efficiency is the main figure of merit in any type of solar cell. Metal halide perovskites (MHP) are mixed electronic-ionic semiconductors with an extraordinary rich optoelectronic behavior, and a record efficiency surpassing 24%. The complexities of MHPs in terms of reproducibility, stability and the oddities that show up at low perturbation frequencies have somehow caused that the connection between truly electronic properties, that is, lifetimes, diffusion lengths and quantum efficiencies had not been paid sufficient attention in the literature. In this communication we report quantum efficiency values for methylammonium lead iodide perovskite solar cells as a function of optical excitation frequency and wavelength, photon flux and temperature. Analysis of the frequency spectrum reveals three time constants or signals, with a quite distinct behavior with respect to the variation of the said experimental parameters. Based on this variation, and the predictions of a drift-diffusion model, we propose a simple interpretation of the electrical origin of the three time constants.
We thank Junta de Andalucía for financial support via grant FQM 1851 and FQM 2310. We thank Ministerio de Economía y Competitividad of Spain and Agencia Estatal de Investigación (AEI) and EU (FEDER) under grants MAT2013-47192-C3-3-R, MAT2016-76892-C3-2-R, MAT2016-79866-R and Red de Excelencia “Emerging photovoltaic Technologies” for financial support. AR thanks the Spanish Ministry of Education, Culture and Sports via a PhD grant (FPU2017-03684).
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