Highly thermal stable and efficient organic photovoltaic cells with crosslinked networks appending open-cage fullerenes as additives

Chih Ping Chen*, Chien Yu Huang, Shih-Ching Chuang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Highly thermal stable organic bulk heterojunction (OBHJ) photovoltaic cells are demonstrated with crosslinkable open-cage fullerenes (COF) as additives in the active layer. Partial incorporation of COF, ≈10-15 wt% with weight ratio of P3HT: PC61BM = 1:0.9, builds up three-dimensional local borders upon heating treatment at 150°C for 10 min. This process induces crosslinking chemical reaction through activating the styryl moiety in COF and reduces phase aggregation rates of fullerenes materials. Supported by statistics of devices degradation data analysis and optical microscopy study, the devices with COF show longer lifetime with keeping their efficiency (t = 144 h) under accelerated heating test at 150°C, while PCE of normal devices without COF drop dramatically. These results demonstrate that the thermally crosslinkable COF is an excellent additive for highly thermal stable and durable OPVs applications.

Original languageEnglish
Pages (from-to)207-213
Number of pages7
JournalAdvanced Functional Materials
Volume25
Issue number2
DOIs
StatePublished - 14 Jan 2015

Keywords

  • Open-cage fullerenes
  • Organic photovoltaics
  • P3HT

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