Small molecule based: N -phenyl carbazole substituted diketopyrrolopyrroles as donors for solution-processed bulk heterojunction organic solar cells

Yuvraj Patil, Rajneesh Misra*, Fang-Chung Chen, Ganesh D. Sharma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We report two acetylene-bridged small molecules DPP5 and DPP6 with low HOMO-LUMO gaps as donors along with PC71BM as an acceptor for the fabrication of solution-processed bulk heterojunction solar cells. After the optimization, i.e. weight ratio of donor to acceptor and surface treatment of the active layer, we achieved overall power conversion efficiencies up to 4.65% (Jsc = 8.19 mA cm-2, Voc = 0.98 V and FF = 0.58) and 5.73% (Jsc = 9.58 mA cm-2, Voc = 0.98 V and FF = 0.61), for DPP5:PC71BM and DPP6:PC71BM respectively, which are superior to those for the devices based on as-cast active layers. The significant change in the power conversion efficiency is attributed to the improvement in nanoscale morphology, balanced charge transport and charge collection efficiency, induced through the surface treatment.

Original languageEnglish
Pages (from-to)22999-23005
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number33
DOIs
StatePublished - 1 Jan 2016

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