Sequential processing: Control of nanomorphology in bulk heterojunction solar cells

Dong Hwan Wang, Ji Sun Moon, Jason Seifter, Jang Jo, Jong Hyeok Park, O. Ok Park, Alan J. Heeger

Research output: Contribution to journalArticlepeer-review

111 Citations (Scopus)


Bulk heterojunction organic photovoltaic devices based on poly[N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′, 7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT)/[6,6]-phenyl C70 butyric acid methyl ester (PC 70BM) can be successfully fabricated by a sequential solution deposition process. When the top layer is deposited from an appropriate cosolvent, the PC70BM penetrates a predeposited bottom layer of PCDTBT during the spin-casting process, resulting in an interdiffused structure with a layer-evolved bulk heterojunction (LE-BHJ) nanomorphology. The PCDTBT:PC70BM LE-BHJ solar cells prepared with an optimized cosolvent ratio have comparable power conversion efficiency to the conventional BHJ solar cells. The nanomorphology of the optimized PCDTBT:PC70BM LE-BHJ mixture was found to have better vertical connectivity than the conventional BHJ material.

Original languageEnglish
Pages (from-to)3163-3168
Number of pages6
JournalNano letters
Issue number8
Publication statusPublished - 2011 Aug 10

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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