Formamidine(FA)-based perovskite solar cells(PSCs)are promising candidates for photoelectric conversion devices due to their excellent optoelectronic properties.However,the instability of perovskites,especially moistu...Formamidine(FA)-based perovskite solar cells(PSCs)are promising candidates for photoelectric conversion devices due to their excellent optoelectronic properties.However,the instability of perovskites,especially moisture instability,remains one of the biggest obstacles to the commercialization of perovskite devices.Therefore,it is very important to explore and target the effect of moisture on FA-based perovskites to prevent this effect and improve device stability.Herein,we studied the degradation process of commonly used FA-based perovskite films by X-ray diffraction and scanning electron microscopy characterization and analyzed the reasons for their humidity-induced degradation.Subsequently,we further adopted a strategy by adding methylammonium bromine powder into a PbI_(2) precursor solution to prepare a seed solution in a two-step preparation process to enhance the performance and stability of FA-based PSCs.Finally,the degradation rate of the obtained perovskite film was significantly slowed down under high humidity compared to that of perovskite films prepared by a two-step method without applying a seed solution.The corresponding device achieved a remarkable power conversion efficiency of 23.22%,and the efficiency of this device showed no attenuation after 900 h of exposure to air.展开更多
基金the support from the National Natural Science Foundation of China(Nos.52025028 and 52002258)the Ministry of Science and Technology of China(No.2021YFA1500803)+2 种基金the Natural Science Foundation of Jiangsu Province(Nos.BK20200877 and BK20210728)“Shuangchuang”Program of Jiangsu Provincethe Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions.
文摘Formamidine(FA)-based perovskite solar cells(PSCs)are promising candidates for photoelectric conversion devices due to their excellent optoelectronic properties.However,the instability of perovskites,especially moisture instability,remains one of the biggest obstacles to the commercialization of perovskite devices.Therefore,it is very important to explore and target the effect of moisture on FA-based perovskites to prevent this effect and improve device stability.Herein,we studied the degradation process of commonly used FA-based perovskite films by X-ray diffraction and scanning electron microscopy characterization and analyzed the reasons for their humidity-induced degradation.Subsequently,we further adopted a strategy by adding methylammonium bromine powder into a PbI_(2) precursor solution to prepare a seed solution in a two-step preparation process to enhance the performance and stability of FA-based PSCs.Finally,the degradation rate of the obtained perovskite film was significantly slowed down under high humidity compared to that of perovskite films prepared by a two-step method without applying a seed solution.The corresponding device achieved a remarkable power conversion efficiency of 23.22%,and the efficiency of this device showed no attenuation after 900 h of exposure to air.
