Diketopyrrolopyrrole-based small molecule for application in solution processed organic solar cells

Mi Young Jo, Jong Hyun Park, Gyeong Eun Lim, Jeong Ho Cho, Seong Soo Park, Seong Soo Hong, Joo Hyun Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A novel donor-π bridge - acceptor (A)-π bridge - donor type molecule (PCTDPP20) with planar core based on diketopyrrolopyrrole (DPP) and carbazole is synthesized by the Suzuki coupling reaction. We introduce phenyl rings to extend the π-conjugation length as a π-bridge. The HOMO and LUMO energy levels of PCTDPP20 are -5.13 and -3.57 eV, respectively. From the UV-Vis spectra, we confirm that the maximum absorption wavelgth (λmax) of the PCTDPP20 annealed film at 100°C is red-shifted about 30 nm and the absorption intensity at 600 ∼ 650 nm increase compared to that of as-spun film. And the OFET based on PCTDPP20 annealed at 100°C exhibits a highest hole mobility of 1.6 × 10-4 cm2/Vs together with a Ion/Ioff ratio of 1.0 × 104 and a Vth of 14 V. Also, the photovoltaic properties are investigated in the device structure of ITO/PEDOT:PSS/PCTDPP20:PC60BM (with different blend ratios)/Al. Among the OSCs, PCTDPP20:PCBM weight ratio of 1:0.8 and termal annealing process at 100°C for 10 min are optimum belnd ratio and temperature, respectively. This device shows the best performance with a highest PCE of 0.95% a Jsc of -2.69 mA/cm2, a Voc of 0.79 V and a fill factor of 44.5%.

Original languageEnglish
Pages (from-to)111-119
Number of pages9
JournalMolecular Crystals and Liquid Crystals
Volume598
Issue number1
DOIs
Publication statusPublished - 2014 Jul 24

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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