Abstract

Perovskite solar cells are a promising alternative because of their easy fabrication process compared to silicon solar cells. The highest efficiency has been achieved with methylammonium-based solar cells because of their high absorption coefficient, low binding energy, and high carrier mobility. Nevertheless, MA-based perovskites are prone to thermal stability because of their volatile nature. In the alternative, we carried out work on formamide-based solar cells. Formamidinium has a high ionic radius (2.55Å) and the lowest band gap (1.47 eV) in the A-site of ABX₃ structured perovskite, which are favourable characteristics for efficient solar cells. FA shows better thermal stability in its black α-phase than its yellow, non-perovskite δ-phase. In this work, we have investigated the structural, morphological, physical, and electrical properties of FAPbI₃ and fabricated a device with FAPbI₃ as the absorbing layer with cost-effective HTL material.

Keywords: Perovskite solar cells, FAPbI_3, Formamidinium solar cells

*Corresponding author: lakshmichinnadurai@gmail.com