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Charge Transfer in Nano Crystal

September 27, 2010
Asked by:Avinash.M.S
Title*:Charge Transfer in Nano
Question*:Can anyone explain the charge transfer process in nano-crystal?

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posted by S @ 9:34 PM  
1 Comments :
  • At September 28, 2010 at 11:00 PM, Anonymous Anonymous said…

    Vyom Parashar - There are a number of charge transfer processes that are thermodynamically favorable based on the semiconductor nanocrystal quantum dots valence and conduction band energies and the reduction potentials of the complexes. However, if processes requiring simultaneous excitation of semiconductor nanocrystal quantum dots and the adsorbed complex are excluded (they are not likely at low excitation intensities used in the PL quenching studies), only two possible processes remain . In first case, a hole is transferred from the semiconductor nanocrystal quantum dots to the complex following semiconductor nanocrystal quantum dots photoexcitation, implying that the semiconductor nanocrystal quantum dots serves as both a sensitizer and a hole donor. In second case, the electron is injected into the conduction band of the semiconductor nanocrystal quantum dots following photoexcitation of the complex, and hence, the semiconductor nanocrystal quantum dots acts as an electron acceptor but not as a sensitizer. While utilizing different photoexcitation pathways, these two processes produce the same final state in which the hole resides on the complex and the electron resides on the semiconductor nanocrystal quantum dots .

     

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