Phase Stability Improvement of a γ-CsPbI₃ Perovskite Solar Cell Utilizing a Barium Bis(trifluoromethanesulfonimide) Solution

Abstract

The cesium lead iodide (CsPbI3) perovskite solar cell possesses a wide band gap ranging from 1.65 to 1.75 eV, which is suitable for integration into a tandem structure along with a low-band-gap silicon solar cell. Moreover, CsPbI3 has received considerable attention as a potential solution for the prevalent issues of low thermal stability of organic–inorganic perovskite solar cells and phase segregation encountered in conventional mixed halide wide-band-gap perovskite solar cells. Through the implementation of volatile additives, CsPbI3 has demonstrated substantial advancements in efficiency, process temperature, and stability. This study introduces a novel approach for barium (Ba)-doping by spraying an antisolvent containing barium bis­(trifluoromethanesulfonimide) during the spin-coating process. By incorporating Ba2+ through this spraying technique, the formation of the delta phase in CsPbI3 is significantly suppressed; thereby, a power conversion efficiency of 18.56% is achieved, and a remarkable 93% of the initial efficiency is maintained after 600 h.

Comprehensive Review on Downconversion/Downshifting Silicate-Based Phosphors for Solar Cell Applications

“…Solar energy offers a promising way forward, and India is significantly interested in this direction . Research is ongoing on next-generation solar cells that are fabricated using dye-sensitized colloidal TiO 2 , − silicon, − perovskite, − and organic-based materials. − From an industrial standpoint, however, silicon photovoltaics (PVs) continue to be the preferred option. In fact, they alone occupy about 90% of the PV market owing to silicon’s merits; viz., it is nontoxic, an ample element in the earth, an elemental semiconductor, and so on.…”