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0506nan木蟲 (小有名氣)
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[求助]
VASP中如何在體系中引入電子和空穴
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各位精通VASP的大蝦們,我剛看到一篇文獻,關于在體系中引入電子和空穴的: Photoexcitation of electron hole pairs in titania results in charge separation, with electrons available to participate in the CO2 reduction. Here, we assume that the dynamics of charge separation is much faster than electron transfer to CO2; therefore the electrons available for reduction are thermalized to the bottom of TiO2 conduction band (CB), which is about 3.8 eV below the vacuum level.17 Photoexcited electrons are modeled by introduction of an extra electron into the system, which populates the conduction band of TiO2. The holes which compensate these electrons and interact with them electrostatically are modeled in three possible ways: (i) completely screened and having no influence (model I); (ii) positive background charge (model II); (iii) localized positive charge in the vicinity,modeled by a proton (model III). J. Phys. Chem. C 2010, 114, 21474–21481 這三個模型是怎么建的啊???VASP中可以同時引入電子和空穴嗎?好像MS中不可以。]用過VASP,所以不明白這三個模型是怎么建的。 知道的請解釋一下,不勝感激!俺比較窮,懸賞10個金幣吧^_^ |
第一性原理 | VASP |

木蟲 (小有名氣)



木蟲 (小有名氣)
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模型1用的gaussian03,模型2和模型3用的VASP。 To account for the presence of an electron from photoexcitation, either an extra electron with a positive compensating background (model II) or one hydrogen atom adsorbed on the surface bridging O atom (model III) is introduced to populate the TiO2 conduction band. In the latter case, the electron from the hydrogen atom redistributes to the bottom of CB of TiO2 within self-consistent calculations leaving behind a proton mimicking a localized hole in terms of its Coulomb potential as long as it does not participate in reactions. In contrast, we consider the positive charge to be completely screened in our cluster calculations. |

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