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| 1 | 通过4-磺基苯甲酸单钾盐抑制离子迁移以实现效率为22.7%的稳定钙钛矿太阳能电池显示文摘晶界处的深能级缺陷和严重的卤素离子迁移对进一步提高钙钛矿太阳能电池的稳定性和效率以及消除迟滞现象提出了严峻的挑战.本文报道了一种大尺寸强配位的有机阴离子晶界锚定策略来抑制离子迁移并钝化薄膜缺陷.本策略通过将含有大尺寸有机阴离子的钾盐(4-磺基苯甲酸单钾盐,SAMS)加入到钙钛矿前驱液中来实现.研究表明,阴离子两端的C=O和/或S=O能够与未配位的Pb^(2+)离子和/或卤化物空位之间发生强配位作用,阴离子中的–OH能够与甲脒阳离子形成氢键,以上化学作用使阴离子紧紧锚定在晶界处.SAMS不仅能够钝化浅能级缺陷,而且能够更有效地钝化深能级缺陷.该晶界锚定策略能降低钙钛矿薄膜的缺陷密度、延长载流子寿命和抑制离子迁移,提高电池的效率和稳定性以及消除迟滞效应.结果表明,基于SAMS改性的电池实现了22.7%的效率,而对照器件显示了20.3%的效率.未封装改性的器件在60℃加热老化1320小时后几乎没有发生衰减. | 白乐 姚方 王锐 刘白白 何冬梅 周倩 王文奇 徐寸云 胡小波 陈少强 宋群梁 周廷伟 Donghwa Lee 赵鹏君 陈聪 杨华 林乾乾 臧志刚 陈江照 | 2022 | Science China Materials2022，65，12： | 2 |
| 2 | Degradation mechanism and stability improvement of formamidine-based perovskite solar cells under high humidity conditions显示文摘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. | Fengren Cao Peng Zhang Haoxuan Sun Meng Wang Liang Li | 2022 | Nano Research2022，15，10： | 0 |
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