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Synthesis and characterization of polymer charge transport materials for applications in high efficiency and stability perovskite solar cell technologies
Hollis, Ashford T.
Hollis, Ashford T.
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2024
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Perovskite solar cells (PSCs) have shown great promise as a low-cost and efficient renewable energy source since their conception in the late 2000s, recently achieving over 26% power conversion efficiencies (PCE) for single junction devices. The hole transport material (HTM) plays an integral part in the performance of PSCs; however, previous studies have shown that the HTM interface with adjacent perovskite/ITO layers can often be a bottleneck for device efficiency and long-term stability. Avenues for improving HTMs include addressing issues with energetic alignment, physical contact with adjacent layers, and lowering manufacturing costs1. Previous attempts to address these issues have included the synthesis of different carbazole and fluorene-based polymers via the Buchwald-Hartwig amination, whose modified backbone allowed for varying thermal and optical properties. This existing inexpensive polymer HTM family was modified with polar side-chain moieties containing methoxyethoxyethyl (O), alkyl oxetane chain (Ox) N,N-dimethyl aminopropyl (N), butanoate (COOCH3), and butanenitrile (CN) in order to improve the interaction with adjacent layers. The synthesis and characterization of monomers and polymers are reported and the effects of these wettable monomer additions on optical, thermal, molecular weight properties, and increased device performance were measured.
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