Quasi-periodic nanoripples in graphene grown by chemical vapor deposition and its impact on charge transport

Guang Xin Ni, Yi Zheng, Sukang Bae, Hye Ri Kim, Alexandre Pachoud, Young Soo Kim, Chang Ling Tan, Danho Im, Jong Hyun Ahn, Byung Hee Hong, Barbaros Özyilmaz

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

The technical breakthrough in synthesizing graphene by chemical vapor deposition methods (CVD) has opened up enormous opportunities for large-scale device applications. To improve the electrical properties of CVD graphene grown on copper (Cu-CVD graphene), recent efforts have focused on increasing the grain size of such polycrystalline graphene films to 100 Î/m and larger. While an increase in grain size and, hence, a decrease of grain boundary density is expected to greatly enhance the device performance, here we show that the charge mobility and sheet resistance of Cu-CVD graphene is already limited within a single grain. We find that the current high-temperature growth and wet transfer methods of CVD graphene result in quasi-periodic nanoripple arrays (NRAs). Electron-flexural phonon scattering in such partially suspended graphene devices introduces anisotropic charge transport and sets limits to both the highest possible charge mobility and lowest possible sheet resistance values. Our findings provide guidance for further improving the CVD graphene growth and transfer process.

Original languageEnglish
Pages (from-to)1158-1164
Number of pages7
JournalACS Nano
Volume6
Issue number2
DOIs
Publication statusPublished - 2012 Feb 28

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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