Enhanced efficiency and stability of quasi-2D/3D perovskite solar cells by thermal assisted blade coating method

In recent years, organometal halide perovskite solar cells (PSCs) have been developed rapidly. To promote commercialization, certain critical issues have to be resolved, for instance, the lack of stability while exposing to moisture, heat, and light. One of the solutions to improve stability is the lower dimension perovskite structure. The high stability of the two-dimensional (2D) perovskite structure can be ascribed to its long-chain organic molecules. In this study, the thermal assisted blade coating method was used to prepare high-quality and pinhole-free perovskite film. We prepared 2D perovskite solutions and fabricated quasi-2D/3D perovskite films with various 2D perovskite solution concentrations. Moreover, we conducted temperature-dependent PL spectra to estimate the exciton binding energies of quasi-2D/3D perovskite film. Finally, our PSC device achieved a power conversion efficiency of 20.26% and possessed long-term ambient stability.