High Conduction Band Polymer Acceptor as a Ternary Component for Indoor Power Generation and Photodiode : Enhanced Photovoltage and Suppressed Dark Current
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Indoor organic photovoltaics (IOPVs) show promise as indoor energy harvesting solutions, while organic photodiodes (OPDs) have potential as flexible and wearable optical sensors, attracting significant attention. Herein, IDSIC-BTI, a new high-conduction band polymer acceptor was synthesized to explore as a ternary component in IOPVs and OPDs. IDSIC-BTI features an electrochemical band gap of 1.91 eV and a high-lying lowest unoccupied molecular orbital (LUMO) of -3.78 eV. When blended with non-fullerene acceptors (NFAs) such as IT-4F and Y6, it forms smooth surface morphology and increases the LUMO levels due to the formation of acceptor-acceptor (A-A) alloys. These elevated energy gap of charge-transfer states (ECT) in ternary blends with PM6 as the donor polymer enhance open circuit voltage (VOC) and reduce dark current density (JD), improving the performance of IOPVs and OPDs.