Stabilizing Lead-Free All-Inorganic Tin Halide Perovskites by Ion Exchange

TitleStabilizing Lead-Free All-Inorganic Tin Halide Perovskites by Ion Exchange
Publication TypeJournal Article
Year of Publication2018
AuthorsJ.K Jiang, C.K Onwudinanti, R.A Hatton, P.A Bobbert, S.X Tao
JournalJournal of Physical Chemistry C, The
Volume122
Issue31
Pagination17660-17667
Abstract

Because of its thermal stability, lead-free composition, and nearly ideal optical and electronic properties, the orthorhombic CsSnI3 perovskite is considered promising as a light absorber for lead-free all-inorganic perovskite solar cells. However, the susceptibility of this three-dimensional perovskite toward oxidation in air has limited the development of solar cells based on this material. Here, we report the findings of a computational study which identifies promising RbyCs1-ySn(BrxI1-x,)(3) perovskites for solar cell applications, prepared by substituting cations (Rb for Cs) and anions (Br for I) in CsSnI3. We show the evolution of the material electronic structure as well as its thermal and structural stabilities upon gradual substitution. Importantly, we demonstrate how the unwanted yellow phase can be suppressed by substituting Br for I in CsSn(BrxI1-x)(3) with x >= 1/3. We predict that substitution of Rb for Cs results in a highly homogeneous solid solution and therefore an improved film quality and applicability in solar cell devices.

DOI10.1021/acs.jpcc.8b04013
Division

PSI

Department

PMI

PID386e39a16974fe39cc12d3ebe8092673
Alternate TitleJ. Phys. Chem. C
LabelOA

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