Dynamics of two-dimensional semiconductor nanoparticle aggregates and heterojunctions

David F. Kelley, Haohua Tu, Shuming Yang, Karoly Mogyorosi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The results reported here focus on the spectroscopy and dynamics of GaSe nanoparticle aggregates, and InSe/GaSe nanoparticle heterojunctions. Nanoparticle aggregates form spontaneously and reversibly in high concentration, room temperature solutions. The high-concentration absorption spectra are semiquantitatively modeled in terms of the lowest two absorption bands of bulk GaSe, quantum confinement effects and dipolar coupling between excited state monomers. From the model, the interparticle coupling is estimated to be about -300 cm -1. Addition of InSe nanoparticles results in these particles being incorporated into the aggregates and thereby forming InSe/GaSe nanoparticle heterojunctions. This results in emission quenching, and suggest that photoinduced charge transfer takes place. Based on energetic considerations, we expect that excitation of a heterojunction will result in electron or hole transfer producing a (InSe) +(GaSe) - charge separated state. Transient absorption results support this interpretation.

Original languageEnglish
Title of host publicationElectron Transfer in Nanomaterials - Proceedings of the International Symposium
Pages286-300
Number of pages15
Publication statusPublished - 2006
Event205th Electrochemical Society Meeting - San Antonio, TX, United States
Duration: May 9 2004May 14 2004

Publication series

NameProceedings - Electrochemical Society
VolumePV 2004-22

Other

Other205th Electrochemical Society Meeting
CountryUnited States
CitySan Antonio, TX
Period5/9/045/14/04

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Kelley, D. F., Tu, H., Yang, S., & Mogyorosi, K. (2006). Dynamics of two-dimensional semiconductor nanoparticle aggregates and heterojunctions. In Electron Transfer in Nanomaterials - Proceedings of the International Symposium (pp. 286-300). (Proceedings - Electrochemical Society; Vol. PV 2004-22).