Evaluating carrier accumulation in degraded bulk heterojunction organic solar cells by a Thermally stimulated current technique

Kenji Kawano, Chi Haya Adachi

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

Here, the initial photo-degradation of encapsulated P3HT:PCBM bulk heterojunction organic solar cells is investigated. The degraded device is recovered by thermal annealing treatment. Thermally stimulated current measurements reveal that the cause of photo-degradation is carrier accumulation and that the degraded organic solar cell has two broad trap levels, of 0.71 and 0.81 eV. These traps are independent of the thickness of the photoactive layers, the mixing ratio of the photoactive materials and the cathode materials. In addition, it is confirmed that there is a close relationship between the degree of degradation and the amount of accumulated charge carriers.

Original languageEnglish
Pages (from-to)3934-3940
Number of pages7
JournalAdvanced Functional Materials
Volume19
Issue number24
DOIs
Publication statusPublished - Dec 23 2009

All Science Journal Classification (ASJC) codes

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

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