Raman study on a bulk-heterojunction film of pentacene and C60

- The Raman spectrum of a pentacene-C60 bulk-heterojunction (blend) film was measured.
- There exist pentacene crystallites in the amorphous C60.
- Pentacene molecules take standing orientation in the crystallites.
- Observed symmetry lowering of C60 is attributable to pentacene-C60 interaction.