Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
The perovskite solar cells (PSCs) achieved a certified power conversion efficiency (PCE) of 25.5% resulting from intensive researches on the fabrication of high quality perovskite layers and and control of interfacial lyaers. However, their road to commercialization still remains owing to the high defect densities existing in the surface of the perovskite films which deteriorates both conversion efficiency and the stability under environmental condition, light, thermal, and humidity. In particular, lead ion which is one of the major defects at the perovskite surface and at the grain boundaries can degrade the photovoltaic properties of the PSCs and cause environmental pollution [1]. To overcome this problems, several efforts have been made to improve the performance, including additive engineering, compositional engineering, and passivation engineering. Among these, additive engineering is considered an efficient approach to fabricate the high quality device by enhancing crystallization and restricting the lead leakage of PSCs.
In this work, environment-friendly biodegradable polymer has been introduced into precursor solution as an additive to improve performacne and limit dissolution of lead ion by water. The biodegradable polymer can not only protect the lead ions by coordination between polymer molecules with functional groups and the un-coordinated Pb2+ but also tune the films morphology with large grain size by long-chain polymer molecules. Furthermore, polymer chains can act as an effective moisture barrier on perovskite surface resulting in enhanced stability. We will discuss the influence of biodegradable polymer additives on the quality of perovskite layer, overall performance of devices, and environment.
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2021R1A2C10101941)
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