A Review of Metal-Free Organic Halide Perovskite: Future Directions for the Next Generation of Solar Cells

Herein, a concise survey on the latest enhancements of the recently discovered metal-free halide perovskites (MFHPs) as the last member of the ABX(3) perovskite systems is portrayed with regard to its preferential characteristics, functions, and diverse structure. Even with features such as electronic band structures similar to physical characteristics such as liquids applied in optoelectronic systems, the heyday of metal-halide perovskites did not last long, because of the emergence of MFHPs. Indeed, the toxic nature of Pb-containing halide perovskites obstructs scaling up in practice while tending to eco-benign materials utilized in the adjustable design and functional probing has come into view as a significant hotspot in photovoltaic research. The MFHPs emerge with unprecedented properties, including light weight, excellent optoelectronic function, variable chemical structures, adjustability, mechanical adaptability, and environmentally benign procedures. These organic semiconductors with good efficiency and long-term stability are used in light-harvesting devices. Here, in the enterprise to upgrade the latest state of the art, we mean to have a quick browse on the various crystalline structure, synthesis approaches, and different properties of metal-free organic halide materials such as ferroelectric, dielectric, piezoelectric, charge transport, electrocaloric refrigeration and mechanical properties. Future perspectives on this late-rising category also are submitted.