Synthesis of a Novel n-Type Conducting Polymer and Its Applications for Enhanced Perovskite Stability

Abstract

Perovskite solar cells (PSCs) offer remarkable potential for low-cost, high-efficiency photovoltaics. However, their widespread adoption is hindered by long-term instability, particularly of the widely studied FAPbI3 composition. Additionally, the development of stable and efficient n-type conducting polymers (CPs) remains a challenge in organic electronics. This thesis addresses both issues through the synthesis of a highly conductive n-type polymer and its application in stabilizing FAPbI3 perovskites.

A simplified method for synthesizing poly(benzodifurandione) (PBFDO), a known n-type CP, was established. The polymer's electrical conductivity and mechanism were thoroughly characterized. Caesium salt of PBFDO was then strategically combined with FAPbI3 to create mixed-cation, multi-component perovskite composites. Complete structural analysis (XRD, SEM, Uv-Vis) revealed the polymer's influence on perovskite crystal formation and morphology.

Importantly, these PBFDO-containing perovskite composites exhibited significantly improved stability under ambient conditions and improved film morphology compared to pure FAPbI3. This work highlights the potential of n-type conducting polymers to unlock new approaches for enhancing perovskite solar cell stability while simultaneously contributing to the development of advanced organic electronic materials.