113 In case of antimony‐based mixed halide perovskites MA 3 Sb 2 I x Br 9− x , the optical bandgap onset for perovskite films shows a decreasing trend, that is, the optical absorption onset is blueshifted from 558 to 453 nm as x changes from 9 to 0.
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Potential Substitutes for Replacement of Lead in Perovskite Solar Cells: A Review.
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The absorption coefficients also display an increasing trend when the proportion of x decreases from 3 to 0 attributed to the redshift of the optical bandgap caused due to change in chemical composition of the material. 113 In case of antimony‐based mixed halide perovskites MA 3 Sb 2 I x Br 9− x , the optical bandgap onset for perovskite films shows a decreasing trend, that is, the optical absorption onset is blueshifted from 558 to 453 nm as x changes from 9 to 0.