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

Overview

Journal Nano Lett

Publisher American Chemical Society

Specialty Biotechnology

Date 2023 Feb 28

PMID 36852730

Authors

Dmitry N Dirin

Anna Vivani

Marios Zacharias

Taras V Sekh

Ihor Cherniukh

Sergii Yakunin

Federica Bertolotti

Marcel Aebli

Richard D Schaller

Alexander Wieczorek

Sebastian Siol

Claudia Cancellieri

Lars P H Jeurgens

Norberto Masciocchi

Antonietta Guagliardi

Laurent Pedesseau

Jacky Even

Maksym V Kovalenko

Maryna I Bodnarchuk

Affiliations

Soon will be listed here.

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 (FASnI) to reach a power conversion efficiency of 14.81% in photovoltaic devices. This progress motivated us to develop a synthesis of colloidal FASnI NCs with a concentration of Sn(IV) reduced to an insignificant level and to probe their intrinsic structural and optical properties. Intrinsic FASnI NCs exhibit unusually low absorption coefficients of 4 × 10 cm at the first excitonic transition, a 190 meV increase of the band gap as compared to the bulk material, and a lack of excitonic resonances. These features are attributed to a highly disordered lattice, distinct from the bulk FASnI as supported by structural characterizations and first-principles calculations.

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