NDLI: Wide-range work-function tuning of active graphene transparent electrodes via hole doping

Content Provider	Royal Society of Chemistry (RSC)
Author	Su, Ching-Yuan He, Shih-Ming Syu, Jheng-Yuan Chang, Chien-Liang Xu, Kai-Xiang Chen, Yu-Min Hung, Wu-Ching
Copyright Year	2016
Abstract	Graphene is regarded as a potential candidate to replace the transparent conductive (TC) electrodes that are currently used in various optoelectronic applications. However, there is still a lack of methods by which to achieve low sheet resistance (Rs) with stable doping and work functions with a wide range of tunability, which is significant for band alignment at the interface to enhance charge transport and thus to achieve higher device performance. We developed a novel strategy for preparing a TC electrode by doping layer-by-layer (LBL)-stacked graphene with AuCl3, by which means an excellent TC performance (an Rs of 40 ohm sq−1 at a transmittance (T) of 89.5%) and an extremely wide range of work-function tunability (∼1.5 eV) were successfully achieved. Moreover, a hybrid electrode prepared by transferring doped graphene onto a pre-patterned Cu metal mesh exhibited a low resistance of ∼4.9 ohm sq−1. In addition, we monitored the long-term stability of AuCl3-doped graphene for 6 months and also constructed a model for accelerated degradation testing. The relevant mechanism of charge transfer between the graphene and the dopants was characterized based on X-ray photoelectron spectroscopy (XPS) spectra to elucidate degradation observed after long-term testing. This work contributes a novel type of “active electrode”; the doped graphene film not only serves as a high-performance TC electrode but also provides a wide range of tunable work functions. The proposed active electrode is prepared using a scalable and facile doping process, which paves the way for its usage in applications such as optoelectronic devices.
Starting Page	32746
Ending Page	32756
Page Count	11
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	6
Issue Number	39
Journal	RSC Advances
DOI	10.1039/c6ra04449b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Optoelectronics Electrode Graphene Sheet resistance Dopant Electronvolt Lawrence Berkeley National Laboratory Photoemission spectroscopy X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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