Role of a [6,6]-phenyl C61 butyric acid methyl ester homologue buffer layer for bulk-heterojunction solar cells

Jin Young Oh, Tae Il Lee, Woo Soon Jang, Soo Sang Chae, Jee Ho Park, Hyun Woo Lee, Jae Min Myoung, Kie Moon Song, Hong Koo Baik

Research output: Contribution to journalArticle


The role of [6,6]-phenyl C61 butyric acid methyl ester (PCBM) as an n-type homologue buffer layer (HBL) was investigated in a bulk-heterojunction solar cell. The n-type HBL was inserted between the photoactive layer and the cathode. We found that the n-type HBL formed an ideal contact between the photoactive layer and the cathode, enhancing the rectifying ability of the device. In addition, the enlarged donor/acceptor interface between the bulk-heterojunction layer and the n-type HBL generated an additional photocurrent through an interdiffusion phenomenon. A device with the controlled n-type HBL (30 nm) had an enhanced power conversion efficiency of nearly 40% compared to the reference device.

Original languageEnglish
Pages (from-to)33-37
Number of pages5
JournalApplied Surface Science
Publication statusPublished - 2013 Oct 15


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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