Design of mechanically-robust naphthalenediimide-based polymer additives for high-performance, intrinsically-stretchable polymer solar cells
- Authors
- Lim, Chulhee; Park, Sanghun; Kim, Dong Jun; Lee, Jin-Woo; Park, Jin-Su; Seo, Soodeok; Kim, Donguk; Kim, Felix Sunjoo; Kim, Taek-Soo; Kim, Bumjoon J.
- Issue Date
- Sep-2023
- Publisher
- Royal Society of Chemistry
- Citation
- Journal of Materials Chemistry A, v.11, no.37, pp 20031 - 20042
- Pages
- 12
- Journal Title
- Journal of Materials Chemistry A
- Volume
- 11
- Number
- 37
- Start Page
- 20031
- End Page
- 20042
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/68359
- DOI
- 10.1039/d3ta03935h
- ISSN
- 2050-7488
2050-7496
- Abstract
- High-molecular-weight electro-active polymer acceptor (PA) is effective in simultaneously increasing photovoltaic performance and mechanical integrity of polymer solar cells (PSCs) based on a polymer donor (PD) and a small molecule acceptor (SMA). In this work, we develop a new naphthalene diimide (NDI)-based PA, named P(NDI2OD-TCVT), and employ it as a PA additive in a PD:SMA blend to fabricate high-performance and mechanically robust PSCs. Copolymerization of NDI, bithiophene, and cyano-vinylene units ensures the n-type characteristics of the P(NDI2OD-TCVT). Noticeably, regio-random attachment of the cyano-vinylene group alleviates the crystalline nature of the NDI-based polymer, providing inter-domain bridges by being a tie molecule. As we vary the weight-average molecular weight (Mw) of the polymer, we find that the backbone structure enables a significant reduction of the critical molecular weight that ensures mechanical robustness. High crack-onset strain (COS) of 30.1% is achieved in the P(NDI2OD-TCVT) film with a relatively low Mw of 109 kg mol−1, which is a stark contrast to the COS value (1.1%) of the reference P(NDI2OD-T2) film with similar Mw of 126 kg mol−1. In addition, we find that incorporation of P(NDI2OD-TCVT) enhances the photovoltaic performance of the PD:SMA-based PSCs, achieving a high power conversion efficiency (PCE) of 16.9%. Benefitted from the significantly enhanced mechanical properties of P(NDI2OD-TCVT), we also demonstrate the highly efficient and intrinsically stretchable polymer solar cells (IS-PSCs). The IS-PSCs with 10 wt% of P(NDI2OD-TCVT) featured a PCE of 12.6% and retained 85% of the initial PCE after 100 cycles of stretching at 20% strain and releasing, outperforming those of P(NDI2OD-T2)-based IS-PSCs. © 2023 The Royal Society of Chemistry
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