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. 2021 Dec 13;11(62):39553–39563. doi: 10.1039/d1ra07609d

The energy band gaps (E_g) of CsSn_1−xCu_xI₃ (x = 0, 0.125, 0.25, 0.5, 1).

Samples	Types of band gap	Present work	Band gap value, E_g (eV)
Samples	Types of band gap	Present work	Exp. ref.	Theo. ref.
CsSnI₃ (unit cell)	Direct	0.442	1.27^a	0.30^b, 0.59^b, 0.38^c
CsSnI₃ (supercell)	Direct	0.445	—	—
CsSn_0.875Cu_0.125I₃	Indirect	0.59	—	—
CsSn_0.25Cu_0.75I₃	Indirect	0.48	—	—
CsSn_0.5Cu_0.5I₃	Indirect	0.42	—	—
CsSnCuI₃	Indirect	0.29	—	—

^a

Ref. 34.

^b

Ref. 28.

^c

Ref. 42.