Kinetics of Distance-Dependent Recombination between Geminate Charge Carriers by Diffusion under Coulomb Interaction
| Autor: | Rupashree Balia Singh, Yohichi Suzuki, Takashi Hisatomi, Hiroyuki Matsuzaki, Tsutomu Minegishi, Akihiro Furube, Kazunari Domen, Kazuhiko Seki |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry C. 119:5364-5373 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b00417 |
| Popis: | The survival probability of electron–hole pairs decays following a power law given by t–1/2 at long times when geminate recombination proceeds under diffusion and Coulomb interaction. Although the power law decay was known, the dependence of the decay amplitude on the strength of the Coulomb interaction, distance dependence of the intrinsic recombination rate, and the diffusion coefficient has not yet been fully understood. In this manuscript, we show analytical expressions on the amplitude of the asymptotic decay and compare the results with the overall kinetics obtained by numerical calculations. The results were applied to the measured data on the kinetics of carriers in LaTiO2N (LTON) solid photocatalyst measured using time-resolved diffuse reflectance spectroscopy (TRDR). The kinetic parameters of carriers were estimated and the presence of trap states was suggested. We also discuss the generalization of the results to the case that the diffusion is dispersive. The dispersive transport of carriers is... |
| Databáze: | OpenAIRE |
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