Pyrrolidinium containing perovskites of thermal stability and water resistance for photovoltaics
The commonly employed methyl-ammonium containing perovskites are unstable at high temperature or under moisture attack, thus limiting their commercial applications. To overcome this barrier, a new perovskite possessing both thermal stability and water resistance has been constructed, involving pyrrolidinium rings (CH2)4NH2PbI3 (PyPbI3), through a simple solution-processed method. It presents not only prolonged moisture resistance and a favorable bandgap of 1.80 eV, as determined by P-XRD and UV absorption , but also excellent thermal stability, as verified via in-situ XRD technique. The new structure may be applicable to the perovskite solar cells of improved thermal stability and water resistance.