Dynamic Interfacial Mechanisms of Long-term Stable Hybrid Perovskite Semiconductors for Photovoltaic Applications
DescriptionHybrid perovskite semiconductors have recently become promising alternatives for low-cost and high-efficient photovoltaics. Their photovoltaic efficiency has increased dramatically by more mature technologies, from 3.8% to 22.1% within a few years. Despite these advantages, the stability of hybrid perovskite photovoltaics remains the most important concern. Stability issues occur in the hybrid perovskite itself but also in other constituent materials, as well as at interfaces between different layers of solar devices. Thus, several approaches have been developed to diminish device degradation. For example, organic semiconductors were replaced by oxides at interfaces to promote moisture and oxygen stability. Central to this proposal is the design of hybrid perovskites, striving to explore fundamental properties and dynamic interactions of interfacial layers to develop efficient and stable perovskite photovoltaics. The PI’s previous research experiences in exciton transfer dynamics of platinum acetylide polymers, in combination with the investigation on photoelectrochemistry at hybrid semiconductors using electrochemical techniques, has helped him gain a broad perspective on semiconductor materials for energy and environment applications alongside a deeper understanding of the challenges.To accomplish these goals, we propose the following tasks. (1) Design novel hybrid materials with stable perovskite-like structures. We will fabricate the perovskite spot array using a piezoelectric dispenser and then screen photoelectrode array by modified SECM techniques. (2) Characterize photoelectrochemical response of hybrid perovskite thin films by designed photoelectrochemical systems to confirm the result of SECM imaging. The photocurrent density of hybrid perovskites will be further optimized by morphology engineering (3) Investigate charge dynamics and transport mechanisms between perovskite film and interfacial layers (i.e. hole transport layer, electron transport layer and modification layer) utilizing photophysical, electrochemical and photoelectochemical techniques. (4) We will fabricate perovskite solar cells with the measurement of photovoltaic parameters, and then understand the relationships among exciton diffusion behaviors, photoelectrochemical response and photovoltaic performance.We believe the implementation of the proposed project could not only advance our fundamental understanding of dynamic interfacial mechanisms on hybrid perovskite solar cells, but also open a new avenue to develop novel perovskite-based solar devices with enhanced efficiency and stability for commercial applications. The results of the project will provide new classroom materials for undergraduate courses as well. The ECS project will enable the PI to continue his research work in a sustained and focused manner, laying the foundation for a lifetime of integrated research and teaching contributions in the areas of semiconductor materials, photophysics, and photoelectrochemistry.
|Effective start/end date||1/09/18 → …|