Fig. 5. Ion doped Cs2AgBiBr6 perovskite solar cells (a) SEM images of Cs2AgBiBr6, Cs1.99Li0.01AgBiBr6(Cs), Cs1.99Na0.01AgBiBr6(Cs-Li), Cs1.99K0.01AgBiBr6(Cs-Na), and Cs1.99Rb0.01AgBiBr6(Cs-K) films; (b) J-V curves of Cs2AgBiBr6 perovskite solar cells (w/o: Cs2AgBiBr6, w Li+: Cs1.99Li0.01AgBiBr6, w Na+: Cs1.99Na0.01AgBiBr6, w K+: Cs1.99K0.01AgBiBr6, w Rb+: Cs1.99Rb0.01AgBiBr6)[54]; (c) Band structure diagram for Cs2AgBiBr6[57]; (d) Tauc plots of Cs2AgSbxBi1-xBr6 (x=0, 0.25, 0.50, 0.75) films[58]; (e) Crystal structure diagram of Cs2AgBiBr6-2xSx; (f) UV-Vis absorption spectra with inset showing corresponding Tauc plots (right) of Cs2AgBiBr6-2xSx film[60]. Colorful figures are available on website
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