Luminescence decay of ruthenium(II) complexes adsorbed on metal oxide powders in vacuo: energy gap dependence of the electron-transfer rate

1988 ◽  
Vol 92 (5) ◽  
pp. 1016-1018 ◽  
Author(s):  
K. Hashimoto ◽  
M. Hiramoto ◽  
A. B. P. Lever ◽  
T. Sakata
Keyword(s):  
Electron Transfer ◽  
Metal Oxide ◽  
Transfer Rate ◽  
Energy Gap ◽  
Luminescence Decay ◽  
Electron Transfer Rate ◽  
Oxide Powders

scholarly journals Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles

2010 ◽  
Vol 108 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Kevin Tvrdy ◽  
Pavel A. Frantsuzov ◽  
Prashant V. Kamat
Keyword(s):  
Electron Transfer ◽  
Quantum Dot ◽  
Metal Oxide ◽  
Transfer Rate ◽  
Metal Oxide Nanoparticles ◽  
Strong Dependence ◽  
Hot Electron ◽  
Electron Transfer Rate ◽  
Metal Oxide Nanoparticle ◽  
Oxide Nanoparticle

Quantum dot-metal oxide junctions are an integral part of next-generation solar cells, light emitting diodes, and nanostructured electronic arrays. Here we present a comprehensive examination of electron transfer at these junctions, using a series of CdSe quantum dot donors (sizes 2.8, 3.3, 4.0, and 4.2 nm in diameter) and metal oxide nanoparticle acceptors (SnO2, TiO2, and ZnO). Apparent electron transfer rate constants showed strong dependence on change in system free energy, exhibiting a sharp rise at small driving forces followed by a modest rise further away from the characteristic reorganization energy. The observed trend mimics the predicted behavior of electron transfer from a single quantum state to a continuum of electron accepting states, such as those present in the conduction band of a metal oxide nanoparticle. In contrast with dye-sensitized metal oxide electron transfer studies, our systems did not exhibit unthermalized hot-electron injection due to relatively large ratios of electron cooling rate to electron transfer rate. To investigate the implications of these findings in photovoltaic cells, quantum dot-metal oxide working electrodes were constructed in an identical fashion to the films used for the electron transfer portion of the study. Interestingly, the films which exhibited the fastest electron transfer rates (SnO2) were not the same as those which showed the highest photocurrent (TiO2). These findings suggest that, in addition to electron transfer at the quantum dot-metal oxide interface, other electron transfer reactions play key roles in the determination of overall device efficiency.

Non-Condon Theory for the Energy Gap Dependence of Electron Transfer Rate

2007 ◽  
pp. 293-297
Author(s):  
Hirotaka Nishioka ◽  
Akihiro Kimura ◽  
Takahisa Yamato ◽  
Toshiaki Kakitani
Keyword(s):  
Electron Transfer ◽  
Transfer Rate ◽  
Energy Gap ◽  
Electron Transfer Rate

Interference, Fluctuation, and Alternation of Electron Tunneling in Protein Media. 2. Non-Condon Theory for the Energy Gap Dependence of Electron Transfer Rate

2005 ◽  
Vol 109 (32) ◽  
pp. 15621-15635 ◽  
Author(s):  
Hirotaka Nishioka ◽  
Akihiro Kimura ◽  
Takahisa Yamato ◽  
Tsutomu Kawatsu ◽  
Toshiaki Kakitani
Keyword(s):  
Electron Transfer ◽  
Transfer Rate ◽  
Energy Gap ◽  
Electron Tunneling ◽  
Electron Transfer Rate

Shapes of the electron-transfer rate vs energy gap relations in polar solutions

1989 ◽  
Vol 93 (26) ◽  
pp. 8316-8323 ◽  
Author(s):  
Akira Yoshimori ◽  
Toshiaki Kakitani ◽  
Yoshitaka Enomoto ◽  
Noboru Mataga
Keyword(s):  
Electron Transfer ◽  
Transfer Rate ◽  
Energy Gap ◽  
Electron Transfer Rate ◽  
Polar Solutions
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