Comparison of mobility extraction methods based on field-effect measurements for graphene

doi:10.1063/1.4921400

CORC > 北京大学 > 信息科学技术学院

	Comparison of mobility extraction methods based on field-effect measurements for graphene
	Zhong, Hua ; Zhang, Zhiyong ; Xu, Haitao ; Qiu, Chenguang ; Peng, Lian-Mao
刊名	aip advances
	2015
DOI	10.1063/1.4921400
英文摘要	Carrier mobility extraction methods for graphene based on field-effect measurements are explored and compared according to theoretical analysis and experimental results. A group of graphene devices with different channel lengths were fabricated and measured, and carrier mobility is extracted from those electrical transfer curves using three different methods. Accuracy and applicability of those methods were compared. Transfer length method (TLM) can obtain accurate density dependent mobility and contact resistance at relative high carrier density based on data from a group of devices, and then can act as a standard method to verify other methods. As two of the most popular methods, direct transconductance method (DTM) and fitting method (FTM) can extract mobility easily based on transfer curve of a sole graphene device. DTM offers an underestimated mobility at any carrier density owing to the neglect of contact resistances, and the accuracy can be improved through fabricating field-effect transistors with long channel and good contacts. FTM assumes a constant mobility independent on carrier density, and then can obtain mobility, contact resistance and residual density stimulations through fitting a transfer curve. However, FTM tends to obtain a mobility value near Dirac point and then overestimates carrier mobility of graphene. Comparing with the DTM and FTM, TLM could offer a much more accurate and carrier density dependent mobility, that reflects the complete properties of graphene carrier mobility. ? 2015 Author(s).; SCI(E); EI; 0; ARTICLE; zyzhang@pku.edu.cn; lmpeng@pku.edu.cn; 5; 5
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/328266]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Zhong, Hua,Zhang, Zhiyong,Xu, Haitao,et al. Comparison of mobility extraction methods based on field-effect measurements for graphene[J]. aip advances,2015.
APA	Zhong, Hua,Zhang, Zhiyong,Xu, Haitao,Qiu, Chenguang,&Peng, Lian-Mao.(2015).Comparison of mobility extraction methods based on field-effect measurements for graphene.aip advances.
MLA	Zhong, Hua,et al."Comparison of mobility extraction methods based on field-effect measurements for graphene".aip advances (2015).