Ultrafast photoinduced electron transfer in conducting polymer—buckminsterfullerene composites

✍ Scribed by B. Kraabel; C.H. Lee; D. McBranch; D. Moses; N.S. Sariciftci; A.J. Heeger

• Book ID: 103030159
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 549 KB
• Volume: 213
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85151-d

✦ Synopsis

We report time-resolved photoinduced absorption and time-resolved photoconductivity in conducting polymer-C& composites. Photoinduced electron transfer occurs at times < I ps. Two subgap features are observed in the photoinduced absorption of pure poly(3-octylthiophene) (P30T); these form earlier than I ps and decay with r< 5 ps. P3OT mixed with C,, shows similar spectral features at early times ( i 1 ps); however, a new spectrum evolves after ;5 1 ps as a result of electron transfer from P30T to Cso. Ultrafast photoinduced electron transfer improves the quantum efficiency for photogeneration of charge carriers; in the ps domain the photoconductivity of the conducting polymer host is enhanced by more than an order of magnitude upon mixing in a few percent G.