Inter-Chain Hydrogen Bondable Conjugated Polymer for Enhancing the Stability of Organic Solar Cells
Nam Gyu Yang a, Sung Jae Jeon a, Doo Kyung Moon a
a Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, Korea, Republic of
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Online, Spain, 2021 May 24th - 28th
Organizers: Marina Freitag, Feng Gao and Sam Stranks
Poster, Nam Gyu Yang, 171
Publication date: 11th May 2021

Organic solar cells (OSCs) have been spotlighted recently for light weight, flexibility, and solution processability. But the stability of the OSCs is one of the biggest issues to overcome. In this study, we designed and synthesized an isoindigo based conjugated polymer P1. Thermo cleavable side chains were substituted to both monomers, and the polymerization was conducted via Stille polycondensation. P1 was readily soluble in organic solvents, indicating it can be used in solution process. But once side chains were cleaved via thermal annealing, the structure became planar to form strong π-π stacking and thereof its solubility dramatically decreased. Face-on orientation and densely packed structure led to the improvement of solvents/acid/UV resistance. P1 was introduced as UV-blocking layer and external protective layer of AgNPs in OSCs, and improved light soaking stability of the cells. P1 can be applied to other organic electronic devices thanks to its self-immobilizing property.

Keywords: Conjugated polymer, Chain cleavage, UV-blocking

This research was supported by New & Renewable Energy Core Technology Programs (Grants 20193091010110) and Human Resources program in Energy Technology (No. 20194010201790) of the Korean Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Ministry of Trade, Industry & Energy, Republic of Korea.

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