Low band gap polymer / PC71BM composities for photovoltaic applications

Jhong Sian Wu, Yen-Ju Cheng, Chain-Shu Hsu*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We report here two novel 2,7-fluorene- And 2,7-carbazole -based conjugated polymers PFDCTBT and PCDCTBT containing ladder-type heptacyclic structures with forced planarity. PFDCTBT and PCDCTBT simultaneously possess excellent solubilities for solution-processability, low band gap with suitable position of HOMO/LUMO energy levels, and high hole mobilities. Both polymers are soluble in common organic solvents. The HOMO levels being estimated to be -5.32 eV for PFDCTBT and -5.38 eV for PCDCTBT are at ideal range to assure better air-stability and greater attainable Voc in the final device.10 It is found that the hole mobility of the PCDCTBT/PC71BM composite (4×10-4 cm2/Vs) is higher than that of the PFDCTBT/PC71BM (5×10-5 cm2/Vs) blend under the same fabrication condition. Without extensive optimization, the preliminary photovoltaic performance based on PFDCTBT already showed a J sc of 9.5 mA/cm2, a Voc of 0.77 V, a fill factor (FF) of 0.38, leading to a decent PCE of 2.8%. More encouragingly, the device using PCDCTBT as the p-type material delivered superior performance with a Jsc of 10.7 mA/cm2, a Voc of 0.80 V, a FF of 0.43, improving the PCE to 3.7%.

Original languageEnglish
Title of host publication7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
PublisherACCM-7 Organizing Committee
Pages131-134
Number of pages4
ISBN (Print)9781632660756
StatePublished - 1 Jan 2010
Event7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010 - Taipei, Taiwan
Duration: 15 Nov 201018 Nov 2010

Publication series

Name7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
Volume1

Conference

Conference7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
CountryTaiwan
CityTaipei
Period15/11/1018/11/10

Keywords

  • Composite
  • Ladder-type
  • Low band-gap
  • Organic solar cell

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