石墨烯
材料科学
纳米技术
纳米-
热电效应
热电材料
复合材料
热导率
物理
热力学
作者
Md Sharafat Hossain,Duc Huynh,Liming Jiang,S Razibur Rahman,Phuong Duc Nguyen,Feras Al-Dirini,Faruque M. Hossain,Je‐Hyeong Bahk,Efstratios Skafidas
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:10 (10): 4786-4792
被引量:15
摘要
Recently, it has been demonstrated that graphene nano-ribbons (GNRs) exhibit superior thermoelectric performance compared to graphene sheets. However, the underlying mechanism behind this enhancement has not been systematically investigated and significant opportunity remains for further enhancement of the thermoelectric performance of GNRs by optimizing their charge carrier concentration. In this work, we modulate the carrier concentration of graphene-based nano-structures using a gate voltage and investigate the resulting carrier-concentration-dependent thermoelectric parameters using the Boltzmann transport equations. We investigate the effect of energy dependent scattering time and the role of substrate-induced charge carrier fluctuation in optimizing the Seebeck coefficient and power factor. Our approach predicts the scattering mechanism and the extent of the charge carrier fluctuation in different samples and explains the enhancement of thermoelectric performance of GNR samples. Subsequently, we propose a route towards the enhancement of thermoelectric performance of graphene-based devices which can also be applied to other two-dimensional materials.
科研通智能强力驱动
Strongly Powered by AbleSci AI