Defect-induced local variation of crystal phase transition temperature in metal-halide perovskites.

ABSTRACT: Solution-processed organometal halide perovskites are hybrid crystalline semiconductors highly interesting for low-cost and efficient optoelectronics. Their properties are dependent on the crystal structure. Literature shows a variety of crystal phase transition temperatures and often a spread of the transition over tens of degrees Kelvin. We explain this inconsistency by demonstrating that the temperature of the tetragonal-to-orthorhombic phase transition in methylammonium lead triiodide depends on the concentration and nature of local defects. Phase transition in individual nanowires was studied by photoluminescence microspectroscopy and super-resolution imaging. We propose that upon cooling from 160 to 140 K, domains of the crystal containing fewer defects stay in the tetragonal phase l

SUBMITTER: Dobrovolsky A 

PROVIDER: S-EPMC5484711 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature