Clear perovskite materials for optoelectronic applications

Abstract

With excellent bandgap and transparency tunability, perovskite materials capture limelight for transparent energy harvesting. This work investigated low dimensional (Quasi 2D) triple cation perovskite thin films with high transparency and no phase separation for clear solar cell, UV absorber, and photodetector applications. Quasi-2D triple cation perovskite thin films with absorption edge close to 420 nm were accomplished. The optoelectronic properties of clear perovskite materials were adjusted upon CsBr incorporation. In this study, correlations between thicknesses, transparency levels, and optoelectronic properties were explored. With 1.5% Cs, the highest power conversion efficiencies of clear perovskite solar cells were 0.68% under xenon lamp irradiation at 100 mW/cm2 and 5.24% under 365 nm UV lamp irradiation at 2.4 mW/cm2. External quantum efficiency (EQE), responsively, and detectivity of materials were explored for photodetector application. Implication of the thesis: The developed perovskite materials are useful for clear solar cell, UV absorber, and photodetector applications. The uniform morphological distribution upon adding low amount of Cs was shown to be a significant improvement in the field of transparent photovoltaics. For photodetector application at 365 nm, EQE of 39.54%, detectivity of 2.42x10(11) cm Hz1/2 W-1, and rise time of 2.41 ms were achieved. This work demonstrates the benefits of composition tunability for desired optoelectronic applications.