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a) UV–vis absorption spectra of V1050, V1061, and Spiro‐OMeTAD, b) UV–vis absorption spectra of TiO2/perovskite (FA0.83Cs0.17Pb(I0.8Br0.2)3) film and perovskite (FA0.83Cs0.17Pb(I0.8Br0.2)3) deposited with Spiro‐OMeTAD and V1050, and V1061 hole transporting materials.
