Fig. 4From: High-Performance CsPbI2Br Perovskite Solar Cells with Zinc and Manganese DopingNormalized Voc, Jsc, FF, and PCE for the solar cell based on the CsPbI2Br-0.25% film as a function of storage time (a). Histogram of power conversion efficiency values for 30 devices (b). Normalized PCE for the solar cell based on the CsPbI2Br-0.25% film as a function of thermal treatment time (c). Absorption spectra (d)Back to article page