Linker Engineering of Dimerized Small Molecule Acceptors for Highly Efficient and Stable Organic Solar Cells
- Authors
- Lee, J.-W.; Sun, C.; Lee, Changyeon; Tan, Z.; Phan, T.N.; Jeon, H.; Jeong, D.; Kwon, S.-K.; Kim, Y.-H.; Kim, B.J.
- Issue Date
- Feb-2023
- Publisher
- American Chemical Society
- Citation
- ACS Energy Letters, v.8, no.3, pp 1344 - 1353
- Pages
- 10
- Journal Title
- ACS Energy Letters
- Volume
- 8
- Number
- 3
- Start Page
- 1344
- End Page
- 1353
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69545
- DOI
- 10.1021/acsenergylett.2c02679
- ISSN
- 2380-8195
- Abstract
- High power conversion efficiency (PCE) and long-term stability are important requirements for commercialization of organic solar cells (OSCs). In this study, we demonstrate efficient (PCE = 18.60%) and stable (t80% lifetime > 4000 h) OSCs by developing a series of dimerized small-molecule acceptors (DSMAs). We prepared three different DSMAs (DYT, DYV, and DYTVT) by using different linkers (i.e., thiophene, vinylene, and thiophene- vinylene- thiophene), to connect their two Y-based building blocks. We find that the crystalline properties and glass transition temperature (Tg) of DSMAs can be systematically modulated by the linker selection. A DYV-based OSC achieves the highest PCE (18.60%) among the DSMA-based OSCs owing to the appropriate backbone rigidity of DYV, leading to an optimal blend morphology and high electron mobility. Importantly, the DYV-based OSC also demonstrates excellent operational stability under 1-sun illumination, i.e., a t80% lifetime of 4005 h. © 2023 American Chemical Society.
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