Toxicity and chemical instability issues of halide perovskites based on organic-inorganic lead-containing materials still remain as the main drawbacks for perovskite solar cells (PSCs). Herein, we discuss the preparation of copper (Cu)-based hybrid materials, where we replace lead (Pb) with nontoxic Cu metal for lead-free PSCs, and investigate their potential toward solar cell applications based on experimental and theoretical studies. The formation of (CHNH)CuX [(CHNH)CuCl, (CHNH)CuClI, and (CHNH)CuClBr] was discussed in details. Furthermore, it was found that chlorine (Cl) in the structure is critical for the stabilization of the formed compounds. Cu-based perovskite-like materials showed attractive absorbance features extended to the near-infrared range, with appropriate band gaps. Green photoluminescence of these materials was obtained because of Cu ions. The power conversion efficiency was measured experimentally and estimated theoretically for different architectures of solar cell devices.

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