Synthesis and characterization of cyclopentadithiophene-based low bandgap copolymers for all-polymer solar cells
Deng, Dan; Gu, Li
| HERO ID | 3575557 |
|---|---|
| In Press | No |
| Year | 2013 |
| Title | Synthesis and characterization of cyclopentadithiophene-based low bandgap copolymers for all-polymer solar cells |
| Authors | Deng, Dan; Gu, Li |
| Journal | Journal of Materials Science: Materials in Electronics |
| Volume | 24 |
| Issue | 2 |
| Page Numbers | 507-513 |
| Abstract | Three conjugated copolymers based on cyclopentadithiophene (CPDT) units, namely, poly{4,4-bis(2-ethylhexyl)cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl-alt-2,1,3-benzothiadiazole-4,7-diyl} (P1), Poly{4,4-bis(2-ethylhexyl)cyclopeanta[2,1-b:3,4-b']dithiophene-2,6-diyl-alt-2,1,3-benzoselenadiazole-4,7-diyl} (P2) and Poly{4,4-bis(2-ethylhexyl)cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl-alt-N,N'-bis(2-ethylhexyl)-3,4,9,10-perylene diimide-1,7-diyl} (P3) have been synthesized via Stille coupling reaction. The polymers were characterized by H-1 NMR spectroscopy, gel permeation chromatography (GPC), UV-vis absorption spectroscopy, and cyclic voltammetry. These new polymers exhibit broad and strong absorption between 500 and 800 nm. The highest occupied molecular orbital energy levels of polymers vary between -4.98 and -5.27 eV and the lowest unoccupied molecular orbital energy levels range from -3.43 to -3.70 eV. By employing P1 and P2 as electron donors (D) and P3 as electron acceptor (A), all-polymer solar cells with bulk heterojunction structure have been fabricated. Preliminary results indicate that these devices show higher open circuit voltage (V (OC) ) in comparison with the traditional polymer/fullerene systems of P1 and P2 blended with the acceptor (6,6)-phenyl C-61-butyric acid methyl ester (PCBM). |
| Doi | 10.1007/s10854-012-0930-3 |
| Wosid | WOS:000313799700013 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |