Enhanced Stability of Sn-based Hybrid Perovskites Induced by Dimethylammonium (DMA): Synthesis, Characterization, Aging and Hydrogen Photogeneration of the MA1-xDMAxSnBr3 System
The novel MA1-xDMAxSnBr3 system has been synthesized and characterized concerning the structural and optical properties. The progressive alloying on the A-site occurs up to x=0.60 and results in a linear blue-shift of the absorption edge with DMA content. Mixed phase maintains the cubic crystal structure of parent MASnBr3. Aging test coupled to X-ray photoelectron spectroscopy indicates that DMASnBr3 is highly tolerant against air-exposure in terms both of crystal structure and optical properties thus representing a first example of a Sn(II)-containing defect-tolerant hybrid perovskite. In addition, thanks to such stability, evidence of hydrogen photogeneration by DMASnBr3 is reported.