Abstract
Abstract In the last few years, new photovoltaic compounds have been sought out for the conversion of renewable and clean solar energy with a view to reducing the production cost of electricity and enhancing the conversion efficiency with a simple manufacturing process. Hybrid organic–inorganic perovskites have emerged among the most promising materials with potential applications in the optoelectronic and photovoltaic fields. These photovoltaic materials draw such a great deal of attention that they are marching towards commercialization thanks to their excellent optical properties, high-power conversion efficiency and low-processing cost. In this paper, we introduce the optical properties of a new lead-free perovskite CH3NH3CdCl3 (MACdCl3) which adopts a tetragonal symmetry (space group P4mm) at ambient conditions. Optical measurements proved that this highly crystalline perovskite absorber has a broad and total visible to near-infrared absorption as well as a tunable indirect band gap (1.1 eV). Besides, recent studies have proposed that the indirect gap is due to the Rashba spin–orbit coupling. These excellent results definitely present a path to high-power conversion efficiency in a two-junction device such as the perovskite-perovskite tandem solar cells.
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