All-Inorganic Perovskite CsSnBr3 as a Thermally Stable, Free-Carrier Semiconductor.
Angew Chem Int Ed Engl
; 57(40): 13154-13158, 2018 Oct 01.
Article
en En
| MEDLINE
| ID: mdl-30113730
ABSTRACT
Hybrid organic-inorganic perovskites, especially methylammonium lead triiodide (MAPbI3 ), are intensely studied for their optoelectronic properties. The organic MA+ cation is held responsible for the superior performance of MAPbI3 but also its instability toward moisture and heat. To explore compositions beyond MAPbI3 , we performed experiments and calculations on two isomorphous perovskites CsSnBr3 and MASnBr3 . CsSnBr3 is slightly smaller than MASnBr3 in cell dimension, but outperforms MASnBr3 in band gap energy, charge-carrier reduced effective mass, and optical dielectric constant all by ≈19 %. These merits accumulate to drastically cut the exciton binding energy from 33â
meV for MASnBr3 to 19.6â
meV for CsSnBr3 , making CsSnBr3 a black, free-carrier semiconductor. CsSnBr3 also exhibits distinctly higher stability toward moisture and heat than its organic counterparts. These advantages suggest ecofriendly applications for CsSnBr3 , such as tandem solar cells and direct X-ray detectors.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Año:
2018
Tipo del documento:
Article
País de afiliación:
China