Composition-Tolerant Terpolymers for Efficient, Nonhalogenated Solvent-Processed Polymer Solar Cells
- Authors
- Lim, C.; Lee, S.; Han, D.; Lee, Changyeon; Kim, B.J.
- Issue Date
- Nov-2022
- Publisher
- American Chemical Society
- Citation
- Macromolecules, v.55, no.23, pp 10395 - 10404
- Pages
- 10
- Journal Title
- Macromolecules
- Volume
- 55
- Number
- 23
- Start Page
- 10395
- End Page
- 10404
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/61135
- DOI
- 10.1021/acs.macromol.2c01974
- ISSN
- 0024-9297
1520-5835
- Abstract
- The design of terpolymers is a compelling strategy to improve the polymer solar cell (PSC) performance. However, the terpolymer composition at which the power conversion efficiency (PCE) of associated PSCs is typically optimized generally falls within a very narrow range, complicating the reproducible fabrication of optimal PSCs. In this study, a series of D-A1-D-A2 type random terpolymers (DTTz-X, where X = 10-60) is designed with structurally similar A1 and A2 accepting units. The sulfur atom of the benzothiadiazole subunit in the A1 (DTBT) unit is replaced by a nitrogen atom in the A2 (DTTz) unit, enabling the introduction of an alkyl solubilizing group while maintaining the overall structural properties of the terpolymer system. Consequently, the DTTz-X PDs maintain good optoelectronic properties at various A1/A2 ratios, while their processability in nonhalogenated solvents is significantly enhanced. Accordingly, the PSC performance of the terpolymer system shows good composition tolerance; i.e., the terpolymer system affords PSCs with PCEs exceeding 15% (up to 16.4%) over a broad range of DTTz compositions (10-40 mol %). This study establishes a useful design strategy for the development of efficient terpolymer donors for reproducible and eco-friendly fabrication of high-performance PSCs. © 2022 American Chemical Society.
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