Investigation of Optoelectronic Properties and Photovoltaic Performance of Efficient Bismuth and Antimony based Mixed Lead-Free Halide Materials
Ashish Kulkarni a, Ajay Jena a, Tsutomu Miyasaka a
a Graduate School of Engineering, Toin University of Yokohama, 1614, Kurogane-cho, Aoba, Yokohama, Kanagawa, Japan 225-8503
Pending, Ashish Kulkarni, presentation 050
Publication date: 14th October 2019

Organic-inorganic hybrid lead halide perovskite materials have attracted immense attention due to their outstanding optoelectronic properties. The photovoltaic devices incorporating perovskite active layer have demonstrated a steep rise in power conversion efficiency (PCE) from 3.8% to 25.2% in just one decade. Despite this, the perovskite solar cells suffer from low stability against moisture, light, heat and oxygen. In addition to this, the intrinsic instability issues of perovskite are also responsible for low stability. In this regards, bismuth (Bi) and antimony (Sb) based halide materials have attracted recent attention due to their high stability. In this work we compositionally design novel Bi and Sb mixed halide materials and investigate their optoelectronic properties. Further, these promising desired materials have been incorporated into the photovoltaic device with TiO2 and dopant free P3HT as electron and hole transport layers respectively. The non-encapsulated best-performing device demonstrated PCE of 3% with high stability against moisture (~50% humidity), continuous light illumination for 1 year and hours respectively. Our present result will provide insights into novel design of lead-free materials for eco-friendly solar cells. 

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