Interplay of Fluorescence Quantum Yield and Photovoltaic Parameters of Perovskite Solar Cells
Mariia Kramarenko a, Catarina G. Ferreira a, Guillermo Martínez-Denegri a, Constanza Sansierra a, Johann Toudert a, Jordi Martorell a
a ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Avinguda Carl Friedrich Gauss, 3, Castelldefels, Spain
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#PERFuDe19. Halide perovskites: when theory meets experiment from fundamentals to devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Claudine Katan, Wolfgang Tress and Simone Meloni
Poster, Mariia Kramarenko, 414
Publication date: 18th July 2019

Hybrid organic-inorganic perovskite solar cells attract much attention because their power conversion efficiency reached very high values (above 24%) in a few years. However, the best values still lag below the theoretical limit and one important reason to that is a non-optimal Voc. According to Shockley and Queisser’s detailed balance, Voc reaches its maximal so-called radiative value Voc,rad if the cell re-emits all the light it absorbs, i.e. if its fluorescence quantum yield QY reaches 100%. Whereas perovskite films have been shown to present high QYs with values up to 43% [1], much lower QYs of a few % have been reported for complete perovskite solar cells [2,3]. Although several phenomena such as non-radiative recombination and parasitic absorption have been proposed to account for these low values, their contribution in actual devices remains to be quantified. Another open question is whether such devices present an ideal behaviour as the one predicted by Shockley and Queisser. To address these points, we will show the results of our recent work in which we measured the QY and photovoltaic properties of complete perovskite solar cells, and analysed the data using an optical model that enables a rigorous calculation of Voc,rad and the quantification of parasitic absorption in a realistic device structure.

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