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A High-Mobility Low-Bandgap Copolymer for Efficient Solar Cells

  1. Ping Ding1,
  2. Cheng-Che Chu2,
  3. Bo Liu3,
  4. Bo Peng1,
  5. Yingping Zou1,3,*,
  6. Yuehui He3,
  7. Kechao Zhou3,
  8. Chain-Shu Hsu2,*

Article first published online: 21 OCT 2010

DOI: 10.1002/macp.201000473

Issue

Macromolecular Chemistry and Physics

Macromolecular Chemistry and Physics

Volume 211, Issue 24, pages 2555–2561, December 15, 2010

Additional Information

How to Cite

Ding, P., Chu, C.-C., Liu, B., Peng, B., Zou, Y., He, Y., Zhou, K. and Hsu, C.-S. (2010), A High-Mobility Low-Bandgap Copolymer for Efficient Solar Cells. Macromol. Chem. Phys., 211: 2555–2561. doi: 10.1002/macp.201000473

Author Information

  1. 1

    College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

  2. 2

    Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan

  3. 3

    State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China

*College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

Publication History

  1. Issue published online: 10 DEC 2010
  2. Article first published online: 21 OCT 2010
  3. Manuscript Revised: 30 AUG 2010
  4. Manuscript Received: 6 AUG 2010

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Keywords:

  • benzodithiophene;
  • conjugated polymers;
  • low bandgap;
  • high mobility;
  • polymer solar cells

Abstract

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A new high-mobility low-bandgap polymer, PBDT-DODTBT, based on benzodithiophene and 5,6-bis(octyloxy)-4,7-di(thiophen-2-yl)benzothiadiazole has been synthesized through a standard Stille coupling reaction. The polymer is soluble in common organic solvents, such as chloroform, tetrahydrofuran, and chlorobenzene and has excellent film forming properties. Preliminary studies of the copolymer showed the charge mobility as high as 7.15 × 10−3 cm2 · V−1 · s−1 from SCLC measurement. Initial photovoltaic cells based on the composite structure of ITO/PEDOT:PSS/PBDT-DODTBT:αPC71BM (1:2)/Ca/Al showed an open-circuit voltage of 0.76 V, a power conversion efficiency of 4.02%, and a short-circuit current of 8.96 mA · cm−2.

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