Abstract: The development of sustainable energy has become an important task for human society, of which the photovoltaic technique has attracted the most attention. Recently, the rapid progress of organic/inorganic hybrid perovskite solar cell (PVSC) has drawn worldwide attention. Within only few years’ development, its power conversion efficiency has transcended the performance of organic photovoltaics, which enables PVSC to be viewed as the revolutionary new-generation photovoltaic materials. Provided its facile solution processability and low cost, the commercialization of PVSCs is potentially feasible in the near future. However, several issues regarding device manufacturing processes are still needed to be addressed prior to the practical applications, especially in terms of interfacial engineering which plays a pivotal role in influencing the crystallization and stability of prepared perovskite film, charge transport in device, and the overall flexibility and stability of the fabricated device. Hence, in this proposal, we will dedicate to develop solution-processed, multifunctional polymeric interlayers to simultaneously enhance the performance and stability of the derived PVSCs. In addition to the exploitation of high-mobility conjugated polymers and the investigation of associated interfacial charge transfer/transport, we will also fine-tune the polymer structures to clarify their structural influence on the crystallization and stability of the prepared perovskite films. We eventually will integrate the interface and device engineering to address the key issues in PVSCs, such as reproducibility, toxicity, and stability. Standing on this achievement, we will continue to develop high-performance flexible PVSCs and anticipate contributing to the future commercialization of PVSCs. We aim to achieve the following goals in this proposal:
(1) Optimize the deposition of perovskite films and investigate the correlation between thin-film morphology and resulting opto-physical properties. Besides, tuning the composition of perovskites to develop photoactive films with varied bandgaps and to reduce the toxic Pb content in perovskite films.
(2) Develop novel conjugated polymer materials with distinct functional groups and investigate their structure-mobility relationship. Besides, aiming to the perovskites with different composition, the structures of the exploited polymeric interlayers will be fine-tuned to promote the crystallization and stability of the prepared perovskite films and to optimize the charge transfer/transport at the corresponding interfaces.
(3) Integrate the exploited polymeric interlayers with device engineering to fabricate high-performance PVSCs and investigate their reproducibility, hysteresis, and stability to purse the optimal conditions of device fabrication. Taking the advantageous flexibility of polymeric interlayers, high-performance flexible PVSCs would be finally accomplished.