Publication date: 4th October 2024
Hybrid organic–inorganic halide perovskites have emerged as prominent high-performance semiconductors for photovoltaic applications. The efficiency of lead (Pb)-based hybrid organic–inorganic halide perovskite solar cells (PSCs) has increased rapidly to 26% in recent years. However, the toxicity of Pb-based PSCs remains the biggest challenge [1]. Many research groups have focused their efforts on the development of Pb-free perovskite materials with reduced toxicity. Recently, double perovskites Cs2AgBiX6 (X = Cl, Br, I) have gained attention as a promising alternative to Pb-based perovskites due to their non-toxic composition and stability.
In this study, we successfully fabricated Pb-free double perovskite Cs2AgBiBr6 solar cell under low temperature process of 140oC. The bandgap (Eg) of the material, estimated by UV-Vis spectroscopy, was found to be 2.6 eV. Photoemission yield spectroscopy (PYS) was performed to analyze the electronic energy levels of the samples. The ionization potential corresponding to the valence band maximum (VBM) was determined to be 5.82 eV. Additionally, the conduction band minimum (CBM) was determined utilizing the VBM and bandgap values calculated with the equation (CBM = VBM - Eg), yielding a CBM value of 3.22 eV. The device performance shows a power conversion efficiency (PCE) of 0.465% with a high fill factor (FF) of 69.5%, demonstrating the potential of Cs2AgBiBr6 double perovskites as the non-toxic absorber material for solar cell applications.
We would like to acknowledge NAIST Granite Fellowships for supporting research activities and research expenses
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