Polymer donors with hydrophilic side-chains enabling efficient and thermally-stable polymer solar cells by non-halogenated solvent processingopen access
- Authors
- Seo, Soodeok; Park, Jun-Young; Park, Jinâ Su; Lee, Seungjin; Choi, Do-Yeong; Kim, Yun-Hiâ; Kim, Bumjoon J. Â.
- Issue Date
- Mar-2024
- Publisher
- Tsinghua University Press
- Keywords
- non-halogenated solvent process; OEG side-chain; polymer donor; polymer solar cell; side-chain engineering
- Citation
- Nano Research Energy, v.3, no.1
- Indexed
- SCOPUS
- Journal Title
- Nano Research Energy
- Volume
- 3
- Number
- 1
- URI
- https://scholarworks.gnu.ac.kr/handle/sw.gnu/69025
- DOI
- 10.26599/NRE.2023.9120088
- ISSN
- 2791-0091
- Abstract
- Polymer solar cells (PSCs) with high power conversion efficiency (PCE) and environment-friendly fabrication are the main requirements enabling their production in industrial scale. While the use of non-halogenated solvent processing is inevitable for the PSC fabrication, it significantly reduces the processability of polymer donors (PDS) and small-molecule acceptors (SMAs). This often results in unoptimized blend morphology and limits the device performance. To address this issue, hydrophilic oligoethylene glycol (OEG) side-chains are introduced into a PD (2EG) to enhance the molecular compatibility between the PD and L8-BO SMA. The 2EG PD induces higher crystallinity and alleviates phase separation with the SMA compared to the reference PD (PM7) with hydrocarbon side-chains. Consequently, the 2EG-based PSCs exhibit a higher PCE (15.8%) than the PM7-based PSCs (PCE = 14.4%) in the ortho-xylene based processing. Importantly, benefitted from the reduced phase separation and increased crystallinity of 2EG PDS, the 2EG-based PSCs show enhanced thermal stability (84% of initial PCE after 120 h heating) compared to that of the PM7-based PSCs (60% of initial PCE after 120 h heating). This study demonstrates the potential of OEG side-chain-incorporated materials in developing efficient, stable, and eco-friendly PSCs. © The Author(s) 2024.
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