Discrepancy of optimum ratio in bulk heterojunction photovoltaic devices: Initial cell efficiency vs long-term stability

Hyunmin Park, Keel Yong Lee, Wanjung Kim, Hee Won Shin, Dong Hwan Wang, Tae Kyu Ahn, Jong Hyeok Park

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Organic photovoltaic devices are difficult to commercialize because of their vulnerability to chemical degradation related with oxygen and water and to physical degradation with aging at high temperatures. We investigated the photophysical degradation behaviors of a series of poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl C61-butyric acid methyl ester (PC60BM) bulk heterojunctions (BHJs) as a model system according to the donor-acceptor ratio. We found that the optimum P3HT:PC60BM ratio in terms of long-term stability differs from that in terms of initial cell efficiency. On the basis of cell performance decays and time-resolved photoluminescence measurements, we investigated the effects of oxygen and material self-aggregation on the stability of an organic photovoltaic device. We also observed the changes in morphological geometry and analyzed the surface elements to verify the mechanisms of degradation.

Original languageEnglish
Pages (from-to)1612-1618
Number of pages7
JournalACS Applied Materials and Interfaces
Volume5
Issue number5
DOIs
Publication statusPublished - 2013 Mar 13

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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