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arXiv 1302.0097cond-mat.mtrl-sci
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有机官能团对石墨烯纳米带电子结构影响的第一性原理研究

The organic functional group effect on the electronic structure of graphene nano-ribbon: A first-principles study

Nuo Liu, Zheqi Zheng, Yongxin Yao, Guiping Zhang, Ning Lu, Pingjian Li, Caizhuang Wang, Kaiming Ho

摘要:

采用第一性原理研究了有机官能团(CH 2C 6 H5)对石墨烯纳米带(aGNRs-f)电子结构的影响,发现CH 2C 6 H5官能团在带隙中不产生任何电子态,带隙为直接带隙.通过改变有机官能团的密度和aGNRs-f的宽度,带隙调谐通过副作用表现出精细的三族行为。同时,当CH_2C_6 H_5浓度较大时,导带底和价带顶的载流子分布在CH_2C_6 H_5和aGNR区,反之,导带底和价带顶的载流子主要分布在aGNR区。带隙调制效应使aGNRs-f成为具有高量子效率的良好候选物,并且由于直接带隙和小的载流子有效质量,对于激光器、发光二极管和光电检测器,具有从750至93924 nm的更多波长选择。

英文摘要:

We report a first-principles study of the electronic structure of functionalized graphene nano-ribbon (aGNRs-f) by organic functional group (CH2C6H5) and find that CH2C6H5 functionalized group does not produce any electronic states in the gap and the band gap is direct. By changing both the density of the organic functional group and the width of the aGNRs-f, a band gap tuning exhibits a fine three family behavior through the side effect. Meanwhile, the carriers at conduction band minimum and valence band maximum are located in both CH2C6H5 and aGNR regions when the density of the CH2C6H5 is big; while they distribute dominantly in aGNR conversely. The band gap modulation effects make the aGNRs-f good candidates with high quantum efficiency and much more wavelength choices range from 750 to 93924 nm both for lasers, light emitting diodes and photo detectors due to the direct band gap and small carrier effective masses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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