The modulation of g-C3N4 energy band structure by excitons capture and dissociation

The modulation of g-C3N4 energy band structure by excitons capture and dissociation
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激子捕获和解离对g-C3N4能带结构的调制

DOI:
10.1016/j.materresbull.2019.110685
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发表时间:
2020-02
影响因子:
5.4
通讯作者:
Ao Xia
Ao Xia
中科院分区:
材料科学2区
文献类型:
--
作者:
Dan Zhang;Guoqiang Tan;Min Wang;Bin Li;Mingyue Dang;Huijun Ren;Ao Xia

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热聚合尿素得到的氮空位g-C3 N4具有最大的激子结合能,氮空位会捕获激子并促使激子在能量无序区解离为自由电子和空穴。氮空位g-C3 N4中大量自由电子的积累导致其费米能级的升高,这意味着氮空位g-C3 N4的导带势将更负。此外,限制效应的增强赋予了它更正的价带势。最终得到了最宽的带隙(2.62 eV)和最强的氧化还原能力(ECB:-1.260 V,EVB:1.360 V)。
The nitrogen vacancy g-C3N4obtained by the thermal polymerization urea possessed the largest exciton binding energy, and the nitrogen vacancies would capture excitons and promote them to dissociate into the free electrons and the holes at energy disordered areas. The accumulation of numerous free electrons in the nitrogen vacancy g-C3N4led to raise its Fermi level, which meant that the conduction band potential of nitrogen vacancy g-C3N4would be more negative. Additionally, the enhancement of the confinement effect endowed it a more positive valence band potential. Eventually, it gave nitrogen vacancy g-C3N4the widest band gap (2.62 eV) and the strongest redox ability (ECB: -1.260 V, EVB: 1.360 V).
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