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Photoinduced Direct Electron Transfer from InSe to GaSe Semiconductor Nanoparticles

2005; American Chemical Society; Volume: 6; Issue: 1 Linguagem: Inglês

10.1021/nl051914s

1530-6992

Haohua Tu, David F. Kelley,

Quantum Dots Synthesis And Properties

Direct electron transfer from InSe nanoparticles to GaSe nanoparticles in mixed solution-phase aggregates has been found to occur upon photoexcitation. Mixed aggregates exhibit a strong charge-transfer absorption band at an energy slightly higher than the InSe band gap. Photoexcitation of this band results in a polarized transient absorption spectrum and transient absorption kinetics characteristic of InSe valence-band holes and GaSe conduction-band electrons. The kinetics indicate that charge separation persists for at least several hundred picoseconds.