凯发

In this talk, we will present our recent results on interface engineering for graphene synthesis and related devices, particularly, high-quality graphene transistors and photodetectors.

A supporting surface of substrate is a prevalent supporting platform to prepare 2-dimensional (2D or graphene-like) layered materials as well as related devices. Besides interface between 2D material and substrate is the locus for charge carrier generation, recombination, and transport. Herein we particularly concentrate on the interface between graphene (carbon sources) and underlying growth substrate, and the interface between graphene and modified substrate in terms of high performance devices. We find that the functionalized interface play a crucial role for sufficiently controlling graphene synthesis and substantially minimizing the interface scattering effect, as well as generating and increasing the carrier mobility. We interrogate several functionalized substrates, namely, passivated SiO2 surface on silicon substrate with self-assembled monolayers (SAMs), and silicon waveguide. The developed techniques are applicable to the other 2D layered materials and related devices. More interestingly, by combining the 2D crystals in one particular stack, one can realize 2D-based heterostructures with intended functionalities. This opens up a new route for future applications of 2D layered materials.

References:

[1] X. Wan, K. Chen, J. B. Xu, submitted to Small (Invited Review) (under revision)

[2] X. M. Wang, W. G. Xie, and J. B. Xu, Adv. Mater. 26, (2014) DOI: 10.1002/adma.201306041

L. Shao, X. M. Wang, H. T. Xu, L. M. Peng, J. B. Xu, and J. F. Wang, Advanced Optical Materials 2, 162-170 (2014)

[3] X. M. Wang, Z. Z. Cheng, K. Xu, H. K. Tsang, J. B. Xu, Nature Photonics 7, 888-891 (2013)

[4] X. Wan, K. Chen, D. Q. Liu, J. Chen, Q. Miao, and J. B. Xu, Chem. Mater. 24, 3906–3915 (2012)

[5] X. Wan, K. Chen, J. Du, D. Liu, J. Chen, X. Lai, W. G. Xie, J. B. Xu, J. Phys. Chem. C 117, 4800–4807 (2013)  

[6] K. Chen, X. Wan, D. Q. Liu, Z. W. Kang, W. G. Xie, J. Chen, Q. Miao, J. B. Xu, Nanoscale 5, 5784-5793  (2013) 

[7] X. M. Wang, J. B. Xu, C. L. Wang, J. Du, W. G. Xie, Adv. Mater. 23, 2464-2468 (2011)

[8] X. M. Wang, W. G. Xie, J. Du, C. L. Wang, N. Zhao, and J. B. Xu, Adv. Mater. 24, 2614-2619 (2012)

[9] K. Chen, X. M. Wang, J. B. Xu, L. J. Pan, X. R. Wang, and Y. Shi, J. Phys. Chem. C 116, 6259-6267 (2012)

[10] X. Q. Tian, J. B. Xu and X. M. Wang, J. Phys. Chem. B 114, 11377-11381 (2010)