Dresden 2020 – wissenschaftliches Programm
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CPP 77.2: Vortrag
Mittwoch, 18. März 2020, 15:15–15:30, POT 251
New insights into emerging lead-free double perovskite materials for optoelectronics — •Fabian Schmitz1, Jonas Horn2, Teresa Gatti1, and Derck Schlettwein2 — 1Justus Liebig University Gießen, Institute of Physical Chemistry — 2Justus Liebig University Gießen, Institute of Applied Physics
Lead-halide perovskites have become top-notch photoactive materials for application in solar cells, photodetectors and LEDs, due to their ease of synthesis, low-costs and excellent solution processability. For photovoltaics particularly, an impressive growth in power conversion efficiency (PCE) has been realized in few years, with current certified record at 25.2 %. Nevertheless, the most efficient perovskite solar cells still suffer from poor environmental stability and contain toxic elements. In this regard, there have been attempts to substitute lead by other metals such as tin or germanium, but no significant improvement in stability has been achieved. Good perspectives are emerging from the use of an all inorganic double perovskite, namely Cs2AgBiBr6 . In this species, divalent lead is replaced by equal molar amounts of monovalent silver and trivalent bismuth. The material is characterized by an excellent environmental stability, but PCE of solar cells containing it are never higher than 2.5 %. Here we report on an optimized preparation of Cs2AgBiBr6 films and on a method to estimate charge carrier diffusion lengths within them. We also provide insights into novel material design strategies for improving optoelectronic performance in this material, by resorting to 2D/3D engineering and doping/alloying.