Congratulations to Junke Jiang for publishing his first first-author paper ‘Stabilizing Lead-Free All-Inorganic Tin Halide Perovskites by Ion Exchange’ at Journal of Physical Chemistry C (Open Access). Jiang et al show the evolution of the electronic structure, thermal and structural stabilities upon gradual substitution of alkali and halide ions in CsSnI3. The study also demonstrates how the unwanted yellow phase can be suppressed by substituting Br for I in CsSn(BrxI1−x)3 with x ≥ 1/3. It is predicted 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.
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