Ultrafast Phenomena XV pp 671-673 | Cite as
Intraband Spectroscopy of GaSe Nanoparticles and InSe/GaSe Nanoparticle Heterojunctions
Abstract
The spectroscopic and dynamical characteristics of electron and hole intraband transitions in several sizes of GaSe nanoparticles have been studied using polarized femtosecond transient absorption spectroscopy. Assignments of the observed absorptions are made in terms of the known GaSe band structure and a model in which the electron and hole states are described by particle-in-a-cylinder states. The results indicate that the transient absorption spectrum is due to a size-independent, z-polarized hole intraband transition, and in the smaller particles, an x,y-polarized electron transition. In InSe/GaSe mixed aggregates, direct electron transfer from InSe to GaSe nanoparticles occurs upon photoexcitation of a charge transfer band. An exciton on GaSe nanoparticles can undergo diffusion and charge separation the an InSe/GaSe heterojunction.
Keywords
Charge Separation Quantum Confinement Transient Absorption Charge Transfer Band Direct Electron TransferPreview
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4. References
- 1.Levy, F., Crystallography and Crystal Chemistry of Materials with Layered Structures. 1976, Holland: Reidel.Google Scholar
- 2.Schluter, M., Nuovo Cimento, 1973. 13B: p. 313.ADSGoogle Scholar
- 3.Doni, E., et al., Nuovo Cimento, 1979. 51B: p. 154.ADSGoogle Scholar
- 4.Piacentini, M., et al., Nuovo Cimento, 1979. 54B: p. 269.Google Scholar
- 5.Chikan, V. and D.F. Kelley, Nano Letters, 2002. 2: p. 141.CrossRefADSGoogle Scholar
- 6.Tu, H., V. Chikan, and D.F. Kelley, J. Phys. Chem. B, 2003. 107: p. 10389.CrossRefGoogle Scholar
- 7.Tu, H., K. Mogyorosi, and D.F. Kelley, J. Chem. Phys., 2005. 122: p. 44709.CrossRefGoogle Scholar
- 8.Tu, H., et al., J. Phys. Chem. B, 2004. 108: p. 4701.CrossRefGoogle Scholar
- 9.Tu, H., K. Mogyorosi, and D.F. Kelley, Phys. Rev. B, 2005. 72: p. 205306.CrossRefADSGoogle Scholar
- 10.Tu, H. and D.F. Kelley, Nano Letters, 2006. 6: p. 116.CrossRefADSGoogle Scholar
- 11.Yang, S. and D.F. Kelley, J. Phys. Chem. B., 2005. 109: p. 12701.CrossRefGoogle Scholar
- 12.Yang, S. and D.F. Kelley, J. Phys. Chem. B, 2006. 110: p. 13430.CrossRefGoogle Scholar