Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Metal halide-based perovskite is the new sensation to solar market. There is a need to search for high-efficiency Pb-free metal halide perovskites. Here we report a novel organic cation (Acetamidinium) for substituted formamidimium tin iodide perovskite. Size-strain plot shows substitution does not enhance strain inside the crystal with respect to control material. Using the acetamidinium-substituted formamidinium tin perovskite as the absorber, we demonstrate solar cells in the p-i-n configuration. The best device exhibited a power conversion efficiency ≈ 1%; with a short-circuit current density (Jsc) of 8.53 mA/cm2, open circuit-voltage (Voc) of 0.3V, and fill-factor (FF) of 39%. Poor Voc of the device is due to conduction band offset of absorber layer with PCBM and interfacial recombination. Further characterization is in progress which will determine the role of small molecules in bulk recombination, transport property, and interfacial layer's role in carrier recombination and charge collection in the substituted lead-free perovskite system.
The authors acknowledge the Ministry of Education, Government of India, for financial support under
Scheme for Transformational and Advanced Research in Sciences (STARS) project number MoESTARS/STARS1/135. This work was conducted at NNfC and MNCF with generous support from MeitY under grant MeitY 5(3)/2017-NANO, by the DST under grant DST/NM/NNetRA/2018(G)-IISc and MHRD.
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