Intrinsic Formamidinium Tin Iodide Nanocrystals by Suppressing the Sn(IV) Impurities.

ABSTRACT: The long search for nontoxic alternatives to lead halide perovskites (LHPs) has shown that some compelling properties of LHPs, such as low effective masses of carriers, can only be attained in their closest Sn(II) and Ge(II) analogues, despite their tendency toward oxidation. Judicious choice of chemistry allowed formamidinium tin iodide (FASnI₃) to reach a power conversion efficiency of 14.81% in photovoltaic devices. This progress motivated us to develop a synthesis of colloidal FASnI₃ NCs with a concentration of Sn(IV) reduced to an insignificant level and to probe their intrinsic structural and optical properties. Intrinsic FASnI₃ NCs exhibit unusually low absorption coefficients of 4 × 10³ cm^-1 at the first excitonic transition, a

SUBMITTER: Dirin DN 

PROVIDER: S-EPMC9999454 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature