Design and Synthesis of 1D-Polymeric Chain Based [(CH3NH3)3Bi2Cl9]n Perovskite: A New Light Absorber Material for Lead Free Perovskite Solar Cells

Although traditional perovskite solar cells have made tremendous progress in terms of efficiency, the presence of toxic lead has restricted their commercialization. Herein, we report the first example of a facile synthesis and a newly designed highly stable lead free methylammonium bismuth chloride in the form of 1D-polymeric chain based perovskite. The formation of a 1D-polymeric chain with formula [(CH3NH3)3Bi2Cl9]n (1) has been authenticated by its single crystal X-ray diffraction (SCXRD) studies. The lead free 1 has been employed as an alternative to the traditional CH3NH3PbX3 perovskite with an excellent open circuit voltage of 430 mV.尽管传统钙钛矿（perovskite）太阳能电池在效率方面已取得长足进展，但有毒铅的存在却限制了其商业化应用。本工作首次报道了一种简便合成策略，以及一种新设计的高稳定性无铅甲胺氯化铋，该材料为基于一维聚合物链的钙钛矿结构。其分子式为[(CH3NH3)3Bi2Cl9]n（编号为1）的一维聚合物链结构，已通过单晶X射线衍射（single crystal X-ray diffraction, SCXRD）测试得到验证。该无铅化合物1被用作传统CH3NH3PbX3钙钛矿的替代材料，其开路电压可达430 mV，性能优异。