Issue 114, 2015
From the journal:

RSC Advances

Ad-layers enhance graphene's performance†

Ting-Wei Chen,a   Ya-Ping Hsieh*a  and  Mario Hofmannb  

* Corresponding authors

a Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chiayi, Taiwan
E-mail: yphsieh@ccu.edu.tw

b Department of Material Science and Engineering, National Cheng Kung University, Tainan, Taiwan

Abstract

Graphene, a monoatomic sheet of graphite, could find application as a transparent conducting film (TCF) in solar cells and electronic devices. Currently available graphene, however, does not meet industry requirements in conductivity for these uses. We here demonstrate that ad-layers, discontinuous graphene islands on top of a complete graphene layer, can significantly enhance graphene's TCF-performance. Two routes were employed to produce controllable densities of ad-layers. Electropolishing pretreatment of the catalyst was found to affect the ad-layer nucleation. Alternatively, variation of the growth parameters was employed to influence the density of ad-layer dimensions. By analyzing the coverage-dependent carrier transport, we identified a continuous enhancement even by small ad-layers. This surprising behavior was quantitatively explained by a high conductivity parallel current path through the ad-layers. The resulting ad-layer-covered graphene exhibits a high and tunable performance as a transparent conductor.

Graphical abstract: Ad-layers enhance graphene's performance

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Article information

DOI
https://doi.org/10.1039/C5RA18984E
Article type
Paper
Submitted
15 Sep 2015
Accepted
27 Oct 2015
First published
27 Oct 2015

RSC Adv., 2015,5, 93684-93688

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Ad-layers enhance graphene's performance

T. Chen, Y. Hsieh and M. Hofmann, RSC Adv., 2015, 5, 93684 DOI: 10.1039/C5RA18984E

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