A high-mobility low-bandgap copolymer for efficient solar cells

Ping Ding, Cheng Che Chu, Bo Liu, Bo Peng, Yingping Zou*, Yuehui He, Kechao Zhou, Chain-Shu Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

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 cm 2 ·V -1 ·s -1 from SCLC measurement. Initial photovoltaic cells based on the composite structure of ITO/PEDOT:PSS/PBDT-DODTBT: α PC 71 BM (1:2)/Ca/Al showed an open-circuit voltage of 0.76V, a power conversion efficiency of 4.02%, and a short-circuit current of 8.96m·cm -2 . A 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 in a good yield. Preliminary studies show the copolymer has the charge mobility as high as 7.15 × - 10 -3 cm 2 ·V -1 ·s -1 from SCLC measurement. Bulk heterojunction solar cells based on the blends of PBDT-DODTBT with PC 71 BM have a PCE of up to 4% under 100mW/cm 2 , AM 1.5 solar illumination.

Original languageEnglish
Pages (from-to)2555-2561
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume211
Issue number24
DOIs
StatePublished - 15 Dec 2010

Keywords

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

Fingerprint Dive into the research topics of 'A high-mobility low-bandgap copolymer for efficient solar cells'. Together they form a unique fingerprint.

Cite this