INTERFACE ENGINEERING FOR EFFICIENT PEROVSKITE SOLAR CELLS

Abstract

Perovskite solar cells (PSCs) with a certificated power conversion efficiency (PCE) of 22.1% have attracted growing attention for harvesting the abundant sunlight energy since the good intrinsic properties of the organic-inorganic metal halide perovskites. However, despite of rapidly development of device performance by modification of perovskites recipes, deposition techniques and device architectures, the carriers’ mobilities mismatch still suppress the commercialization of the PSCs. In this thesis, the carriers transport mechanisms at TiO2/perovskite and perovskite/carbon interfaces have been investigated. Some promising interface engineering techniques, such as Cs2CO3 doping of TiO2 layers, CsI doping of mixed-cation perovskites and incorporation of Au@SiO2 nanoparticles, have been utilized to balance the free electron and hole transport in various PSCs. Based on these results, further optimizing of the interfacial charge carrier extraction and transport (inhibiting interfacial charge recombination and ion migration) to suppress the hysteresis effect within the devices can be pursued in the further.