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ULTRAFAST INTERFACIAL ELECTRON TRAPPING AND RECOMBINATION IN PHOTOEXCITED COLLOIDAL CADMIUM SULFIDE

Kim, Seong-Kyu    (Department of Chemistry, Sung Kyun Kwan University, Suwon, 440-746, KOREA  );
  • 초록

    We measured, using femtosecond pump-probe experiment, the time evolution of transient absorption in aqueous CdS colloids. The signal rises within the time resolution (= 0.5 ps) of the experiment and decays with two exponential time constants, 4.8 ps and 132 ps. The ultrafast rise of the transient absorption is considered to be for shallowly trapped conduction band electrons after photoexcitation. The amplitude ratio of the two decaying components varies with the pump intensity and the decay times increase in the presence of hole scavengers. Even though a biexponential function fits the decay well, we object hat two independent first order processes (geminate and nongeminate recombinations) are responsible for the decay. A function with an integrated rate equation for second order nongeminate recombination plus a long background fits the decay well. The long background is considered to be for deeply trapped charges at the CdS particle.


  • 참고문헌 (23)

    1. Gratzel, M. , Energy Resources through Photochemistry and Catalysis / v.,pp.,
    2. Heterogeneous photocatalysis , Fox, M. A.;M. T. Dulay , Chem. Rev. / v.93,pp.341-357,
    3. Luminescence of colloidal CdS particles in acetonitrile and acetonitrile/water mixture , Ramsden, J. J.;S. E. Webber;M. Gratzel , J. Phys. Chem. / v.89,pp.2740-2743,
    4. Quantum simulation of ultrafast spectroscopy , Rossky, P. J. , J. Opt. Soc. Am. / v.B7,pp.1727-1735,
    5. Local field effect in small semiconductor clusters and particles , Wang, Y. , J. Phys. Chem. / v.95,pp.1119-1124,
    6. Femtosecond investigation of electron trapping in semiconductor nanoclusters , Skinner, D. E.;D. Colombo, Jr.;J. J. Cavaleri;R. M. Bowman , J. Phy. Chem. / v.99,pp.7853-7856,
    7. Formation and decay of methylviologen radical cation dimers on the surface of colloidal CdS : Separation of two-and three-dimensional relaxation , Ramsden, J. J.;M. Gratzel , Chem. Phys. Lett. / v.132,pp.269-272,
    8. A quantum dot quantum well: CdS/HgS/CdS , Eychmuller, A.;A. Mews;H. Weller , Chem. Phys. Lett. / v.208,pp.59-62,
    9. Size quantization in small semiconductor particles , Nozik, A. J.;F. Williams;M. T. Nenadovic;T. Rajh;O. I. Micic , J. Phys. Chem. / v.89,pp.397-399,
    10. Femtosecond studies of interparticle electron transfer in a coupled CdS-TiO₂colloidal system , Evans, J. J.;K. W. Springer;J. Z. Zhang , J. Chem. Phys. / v.101,pp.6222-6225,
    11. Charge carrier trapping and recombination dynamics in small semiconductor particles , Rothenberger, G.;J. Moser;M. Gratzel;N. Serpone;D. K. Sharma , J. Am. Chem. Soc. / v.107,pp.8054-8059,
    12. Electronic states of semiconductor clusters: Homogeneous and inhomogeneous broadening of the optical spectrum , Alivisatos, A. P.;A. L. Harris;N. J. Levinos;M. L. Steigerwald;L. E. Brus , J. Chem. Phys. / v.89,pp.4001-4011,
    13. Detection of shallow electron traps in quantum sized CdS by fluorescence quenching experiments , Hasselbarth, A.;A. Eychmuller;H. Weller , Chem. Phys. Lett. / v.203,pp.271-276,
    14. Colloidal zinc cadmium sulfide (Zn₁$_xCd_xS$): Optieal saturation of the exction band and primary photochemistry studied by subpicosecond laser flash photolysis , Ernsting, N. P.;M. Kaschke;H. Weller;I, Katsikas , J. Opt. Soc. Am. / v.B7,pp.1630-1637,
    15. Serpone, N.;E. Pelizzetti , Photocatalysis, Fundamentals and Applications / v.,pp.,
    16. Semiconductor nanocrystals covalently bound to metal surfaces with self-assembled monolayers , Colvin, V. L.;A. N. Goldstein;A. P. Alivisatos , J. Am. Chem. Soc. / v.114,pp.5221-5230,
    17. Ultrafast electron reaction and trapping in semiconductor colloids after multiple photon absorption , Kaschke, M.;N. P. Ernsting;U. Muller;H. Weller , Chem. Phys. Lett. / v.168,pp.543-550,
    18. Femtosecond studies of photoinduced electron dynamics at the liquid-solid interface of aqueous CdS colloids , Zhang, J. Z.;R. H. O'Neil;T. W. Roberti , J. Phys. Chem. / v.98,pp.3859-3864,
    19. Catalysis of photochemical reactions by colloidal semiconductors , Henglein, A. , Pure & Appl. Chem. / v.56,pp.1215-1224,
    20. Photochemistry of colloidal semiconductors. 26. Photoelectron emission from CdS particles and related chemical effects , Hasse, M.;H. Weller;A. Henglein , J. Phys. Chem. / v.92,pp.4706-4712,
    21. Photoelectrochemistry in particulate systems. 6. Electron-transfer reactions of small CdS colloids in acetonitrile , Kamat, P.V.;N. M. Dimitrijevic;R. W. Fessenden , J. Phys. Chem. / v.91,pp.396-401,
    22. Photochemistry on nonreactive and reactive (semiconductor) surface , Kamat, P. V. , Chem. Rev. / v.93,pp.267-300,
    23. Picosecond resonance raman scattering study of methylviologen reduction on the surface of photoexcited colloidal CdS crystallites , Rossetti, R.;L. E. Brus , J. Phys. Chem. / v.90,pp.558-560,

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