Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States.
National Center for Nanoscience and Technology , Beiyitiao No. 11, Zhongguancun, Beijing 100190, P. R. China.
ACS Nano. 2016 Dec 27;10(12):11136-11144. doi: 10.1021/acsnano.6b06066. Epub 2016 Nov 29.
In this work, we report the transfer-free measurement of carrier dynamics and transport of direct chemical vapor deposition (CVD) grown graphene on glass with the aid of ultrafast transient absorption microscopy (TAM) and demonstrate the use of such graphene glass for high-performance touch panel applications. The 4.5 in.-sized graphene glass was produced by an optimized CVD procedure, which can readily serve as transparent conducting electrode (TCE) without further treatment. The graphene glass exhibited an intriguing optical transmittance and electrical conductance concurrently, presenting a sheet resistance of 370-510 Ω·sq at a transmittance of 82%, much improved from our previous achievements. Moreover, direct measurement of graphene carrier dynamics and transport by TAM revealed the similar biexponential decay behavior to that of CVD graphene grown on Cu, along with a carrier mobility as high as 4820 cm·V·s. Such large-area, highly uniform, transparent conducting graphene glass was assembled to integrate resistive touch panels that demonstrated a high device performance. Briefly, this work aims to present the great feasibility of good quality graphene glass toward scalable and practical TCE applications.
在这项工作中，我们借助超快瞬态吸收显微镜（TAM）报告了无转移测量直接化学气相沉积（CVD）生长在玻璃上的石墨烯的载流子动力学和输运，并展示了此类石墨烯玻璃在高性能触摸面板应用中的用途。4.5 英寸大小的石墨烯玻璃是通过优化的 CVD 工艺生产的，它可以无需进一步处理即可直接用作透明导电电极（TCE）。该石墨烯玻璃同时表现出有趣的光学透过率和电导，其透光率为 82%时的方阻为 370-510 Ω·sq，比我们之前的成果有了很大的提高。此外，通过 TAM 对石墨烯载流子动力学和输运的直接测量揭示了与在 Cu 上生长的 CVD 石墨烯相似的双指数衰减行为，以及高达 4820 cm·V·s 的载流子迁移率。这种大面积、高度均匀、透明的导电石墨烯玻璃被组装成集成电阻式触摸面板，展示了出色的器件性能。简而言之，这项工作旨在展示高质量石墨烯玻璃在可扩展和实用的 TCE 应用中的巨大可行性。
