Professor David B. Mitzi, Duke University
Currently, the highest performing hybrid perovskite is CH3NH3PbI3. Unfortunately, despite these excellent properties, chemical stability is still a major concern facing hybrid perovskites as they move toward industrial deployment. An inspiring talk from Professor David B. Mitzi at the MRS meeting today has mentioned about the well-defined screening criteria to search for a new perovskite material with better stability. For the first round of selection, the material needs to be earth abundant, low cost and non-toxic. The next round considers the optoelectronic properties of the material including direct bandgap, high absorption, high electron and hole mobility, low strap states and benign grain boundary. For the final round, a solar cell needs to be built from the material and tested for efficiency and stability. As an example of going through the whole new material designing process, Professor David Mitzi group has explored a new perovskite material with the formula (CH3NH3)2Pb(SCN)2I2 (MAPSI) with better stability. More detailed information can be found here.