Programme

P.47 -- Poster, NCTP-43

Date: Wednesday, 1 August 2018

Time: 08:30 - 10:00

Tuning electronic transport properties of the V-shaped edge distorted zigzag graphene nanoribbons with substitutional doping

Nguyen Van Ut(a),(b)*, Bui Thai Hoc(a), Tran Thi Ngoc Thao(a), Nguyen Thanh Tien(a)

a) Department of Physics, College of Natural Science, Can Tho University b) Cao Lanh I High School, Cao Lanh City, Dong Thap Province

Density-functional theory (DFT) in combination with the nonequilibrium Green’s function formalism is used to study the effect of substitutional doping on the electronic transport properties of V-shaped edge distorted zigzag graphene nanoribbons (DZGNR). We consider DZGNR terminated by H atoms with four, six, eight zigzag carbon chains respectively. In this work, Si atoms are used to substitute carbon atoms located at the center of the samples. Our calculated results have determined that Si can change the material type by the number of dopants. We found that the transmission spectrum depends on number chains of the sample and location of dopant: the largest transmission is obtained for eight chains, and the single doping in the middle of the samples give larger transmission. The obtained results are explained in terms of electron localization in the system due to the presence of impurities. The relationship between the transmission spectrum, the device density of states and the I-V curve indicates that DZGNR can be applied well in electronic nanodevices.

Presenter: Nguyen Thanh Tien