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  Kumar, P.; Ahmad, K.; Dagar, J.; Unger, E.; Mobin, S.M.: Two-Step Deposition Approach for Lead Free (NH₄)₃Sb₂I₉ Perovskite Solar Cells with Enhanced Open Circuit Voltage and Performance. ChemElectroChem 8 (2021), p. 3150-3154

10.1002/celc.202100957

Abstract:
In recent years, development of lead (Pb) free perovskite solar cells (PSCs) has attracted the scientific community because of their stability in air and less toxic nature. Antimony (Sb) based perovskite like-materials such as (CH3NH3)(3)Sb2I9 and (NH4)(3)Sb2I9 have been employed as light absorbers and showed promising features for photovoltaic applications. Herein, we have utilized (NH4)(3)Sb2I9 as light absorber for the construction of Pb free PSCs. Moreover, we have employed a modified two step procedure for the preparation of (NH4)(3)Sb2I9. The developed Pb free PSCs device (FTO/CL-TiO2/m-TiO2/(NH4)(3)Sb2I9/HTM/Au) exhibited enhanced power conversion efficiency (PCE) of 0.42 % with open circuit voltage (Voc) of 945 mV.