A potential naphtho[2,1-b:3,4-b ']dithiophene-based polymer with large open circuit voltage for efficient use in organic solar cells
SCIE
SCOPUS
- Title
- A potential naphtho[2,1-b:3,4-b ']dithiophene-based polymer with large open circuit voltage for efficient use in organic solar cells
- Authors
- Kim, YJ; Cheon, YR; Jang, JW; Kim, YH; Park, CE
- Date Issued
- 2015-01
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- A novel copolymer, PNDT-BTN, based on naphtho[2,1-b:3,4-b'] dithiophene (NDT) and alkoxy naphthalene, was designed and synthesized by the Pd-catalyzed Stille-coupling method. The copolymer demonstrated good solubility and film-forming ability, along with good thermal stability. PNDT-BTN exhibited a broad absorption (from 300 to 600 nm), centered at 492 nm. HOMO and LUMO energy levels of the polymer were estimated to be -5.56 eV and -3.48 eV, respectively. The polymer solar cell fabricated from the blend of the polymer (donor) and PC71BM (acceptor) exhibited a high power conversion efficiency of 4.29% with a high V-OC of 0.98 V. To the best of our knowledge, this is among the highest V-OC values of PSCs based on NDT derivatives. This work demonstrates that the replacement of a vinylene group in a conjugated polymer with alkoxy naphthalene moieties is able to significantly lower HOMO energy levels, and therefore, increase the open circuit voltage of solar cells.
- Keywords
- ENHANCED PHOTOVOLTAIC PERFORMANCE; EXTENDED PI-CONJUGATION; LOW-BANDGAP POLYMERS; DEEP HOMO LEVEL; SMALL MOLECULES; BENZODITHIOPHENE; THIOPHENE; ACCEPTOR; COPOLYMERS; MORPHOLOGY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13225
- DOI
- 10.1039/C4TC02597K
- ISSN
- 2050-7526
- Article Type
- Article
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, vol. 3, no. 9, page. 1904 - 1912, 2015-01
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