Design and Synthesis of 1D-Polymeric Chain Based [(CH₃NH₃)₃Bi₂Cl₉]<i>n</i> 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.