Considering sustainable development factors such as element abundance,cost,environmental friendliness,and stability,the research and development of novel inorganic non-lead perovskites are very significant.Copper-silv...Considering sustainable development factors such as element abundance,cost,environmental friendliness,and stability,the research and development of novel inorganic non-lead perovskites are very significant.Copper-silver-bismuth iodide(CABI)is a promising solar cell material with halide perovskite genes,possessing eco-friendly,element-rich,and cost-effective characteristics.The fabrication of high-quality CABI films with tailored compositions still poses a substantial hurdle.We developed a CuAgBi_(2)I_(8) material that effectively reduced the bandgap to 1.69 eV by optimizing Bi distribution to create an environment conducive to insitu redox reactions of Bi with I_(2),Cu,and Ag via vapor-phase synthesis.This strategy proved highly effective in synthesizing high-quality CuAgBi_(2)I_(8) compound,accompanied by significant improvements in film quality,including enhanced crystallinity,minimized defects,and reduced non-radiative recombination.The crystal structure of CuAgBi_(2)I_(8) and mechanisms of elemental reactions and diffusion are discussed.Devices featuring the structure FTO/c-TiO_(2)/m-TiO_(2)/CuAgBi_(2)I_(8)/CuI/Spiro-OMeTAD/carbon achieved a champion efficiency of 3.21%,the highest for CABI solar cells.This work provides a novel idea and approach to governing the gas-solid element diffusion and reaction for highquality CABI and related halide perovskite films.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:52472255,52072327,22309158Science and Technology Project of Henan Province,Grant/Award Number:252102230120+3 种基金Higher Education and Teaching Reformation Project,Grant/Award Number:2024SJGLX0451Academic Degrees&Graduate Education Reform Project of Henan Province,Grant/Award Number:YJS2022JD34Key Research and Development Projects of Universities in Henan Province,Grant/Award Number:23B430009Natural Science Foundation of Henan Province,Grant/Award Number:232300420099。
文摘Considering sustainable development factors such as element abundance,cost,environmental friendliness,and stability,the research and development of novel inorganic non-lead perovskites are very significant.Copper-silver-bismuth iodide(CABI)is a promising solar cell material with halide perovskite genes,possessing eco-friendly,element-rich,and cost-effective characteristics.The fabrication of high-quality CABI films with tailored compositions still poses a substantial hurdle.We developed a CuAgBi_(2)I_(8) material that effectively reduced the bandgap to 1.69 eV by optimizing Bi distribution to create an environment conducive to insitu redox reactions of Bi with I_(2),Cu,and Ag via vapor-phase synthesis.This strategy proved highly effective in synthesizing high-quality CuAgBi_(2)I_(8) compound,accompanied by significant improvements in film quality,including enhanced crystallinity,minimized defects,and reduced non-radiative recombination.The crystal structure of CuAgBi_(2)I_(8) and mechanisms of elemental reactions and diffusion are discussed.Devices featuring the structure FTO/c-TiO_(2)/m-TiO_(2)/CuAgBi_(2)I_(8)/CuI/Spiro-OMeTAD/carbon achieved a champion efficiency of 3.21%,the highest for CABI solar cells.This work provides a novel idea and approach to governing the gas-solid element diffusion and reaction for highquality CABI and related halide perovskite films.
