Charge Photogeneration and Transport in AgBiS2 Nanocrystal Films for Photovoltaics
Silke L. Diedenhofen (TU Delft - ChemE/Opto-electronic Materials)
Maria Bernechea (Universidad de Zaragoza, Cardiff University)
Kevin M. Felter (TU Delft - ChemE/Opto-electronic Materials)
Ferdinand C. Grozema (TU Delft - ChemE/Opto-electronic Materials)
Laurens D.A. Siebbeles (TU Delft - ChemE/Opto-electronic Materials)
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Abstract
Solution-processed AgBiS2 nanocrystal films are a promising material for nontoxic, earth-abundant solar cells. While solar cells with good device efficiency are demonstrated, so far, hardly anything is known about charge generation, transport, and recombination processes in these films. Here, a photoinduced time-resolved microwave conductivity study on AgBiS2 nanocrystal films is presented. By modeling the experimental data with density-dependent recombination processes, the product of the temperature-dependent electron and hole quantum yield and mobility, and the electron and hole recombination kinetics are determined.