Figure 4 | Scientific Reports

Figure 4

From: Chemical Vapor Deposition of Organic-Inorganic Bismuth-Based Perovskite Films for Solar Cell Application

Figure 4

Absorption spectra of the BiI3-only film and MBI layers on FTO/c-TiO2/mp-TiO2 substrates deposited with a BiI3 rate of 0.5 nm/min, a substrate temperature of 88 °C and different MAI/BiI3 ratios. The interpolated absorption edges are exhibited by the dashed vertical lines. The arrows illustrate the drop of absorption in the region of 500 to 650 nm for MBI layers without residual BiI3.

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