Synthesis and characterization of phenathrothiadiazole-based conjugated polymer for photovoltaic device

Suhee Song, Seijung Park, Sooncheol Kwon, Byoung Hoon Lee, Ju Ae Kim, Sung Heum Park, Youngeup Jin, Jongjin Lee, Il Kim, Kwanghee Lee, Hongsuk Suh

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A new accepter with phenanthro[9,10-c][1,2,5]thiadiazole unit was synthesized and utilized for the synthesis of the conjugated polymers, PCPDTDTPT and PCDTPT, containing electron donor-acceptor pairs for OPV devices. This novel phenanthro[9,10-c][1,2,5]thiadiazole unit with phenanthene group can supply planarity and possess electron deficient thiadiazole group. The solid films of PCPDTDTPT and PCDTPT show absorption bands with maximum peaks at 492 and 394 nm and the absorption onsets at 620 and 519 nm, corresponding to band gaps of 2.00 and 2.39 eV, respectively. The HOMO and LUMO levels of PCPDTDTPT and PCDTPT were estimated to be (-5.54, -3.63) and (5.81, 3.65) eV, respectively. The PCDTPT with carbazole moiety shows lower HOMO levels as compared to PCPDTDTPT caused by strong electron donating ability of nitrogen atom to provide higher V oc. The devices with PCPDTDTPT: PC 71BM with TiO x layer showed a V OC of 0.77 V, a J SC of 4.71 mA/cm 2, and a FF of 0.36, giving a power conversion efficiency of 1.24%. Crown

Original languageEnglish
Pages (from-to)1936-1943
Number of pages8
JournalSynthetic Metals
Issue number21-22
StatePublished - Dec 2012

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0015069 ) and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2011-0010851 ).


  • Phenanthrothiadiazole
  • Photovoltaic cells
  • Polymer
  • Synthesis


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