High-Efficiency Graphene Photo Sensor Using a Transparent Electrode
LIU Tao1**, HUANG Zheng2
1National Key Laboratory for Electronic Measurement Technology and Key Laboratory of Instrumentation Science and Dynamic Measurement, North University of China, Taiyuan 030051 2Xi'an Institute of Electromechanical Information Technology, Xi'an 710065
High-Efficiency Graphene Photo Sensor Using a Transparent Electrode
LIU Tao1**, HUANG Zheng2
1National Key Laboratory for Electronic Measurement Technology and Key Laboratory of Instrumentation Science and Dynamic Measurement, North University of China, Taiyuan 030051 2Xi'an Institute of Electromechanical Information Technology, Xi'an 710065
摘要We report the first implementation of transparent electrodes in bottom-gate graphene transistors used for photo detection. Compared to conventional nontransparent electrodes, the transparent electrodes allow photons to transmit through to the graphene beneath, providing an enlarged absorption area and thereby giving rise to an enhancement of photocurrent generation. The devices are fabricated with an asymmetric metallization scheme and the experimental results show that the maximum photocurrent density using the transparent electrodes (ITO and Pd/ITO) is over two times higher than that using the nontransparent electrodes (Ti and Pd), indicating a significant enhancement in the performance of graphene photo sensors.
Abstract：We report the first implementation of transparent electrodes in bottom-gate graphene transistors used for photo detection. Compared to conventional nontransparent electrodes, the transparent electrodes allow photons to transmit through to the graphene beneath, providing an enlarged absorption area and thereby giving rise to an enhancement of photocurrent generation. The devices are fabricated with an asymmetric metallization scheme and the experimental results show that the maximum photocurrent density using the transparent electrodes (ITO and Pd/ITO) is over two times higher than that using the nontransparent electrodes (Ti and Pd), indicating a significant enhancement in the performance of graphene photo sensors.
[1] Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V and Firsov A A 2004 Science 306 5696
[2] Novoselov K S, Geim A K, Morozov S V, Jiang D, Katsnelson M I, Grigorieva I V, Dubonos S V and Firsov A A 2005 Nature 438 197
[3] Zhang Y, Tan Y W, Stormer H L and Kim P 2005 Nature 438 201
[4] Du X, Skachko I, Duerr F, Luican A and Andrei E Y 2009 Nature 462 192
[5] Mueller T, Xia F and Avouris P 2010 Nature Photon. 4 297
[6] Xia F, Mueller T, Lin Y, Valdes-Garcia A and Avouris P 2009 Nature Nanotech. 4 839
[7] Khomyakov P A, Giovannetti G, Rusu P C, Brocks G, Van den Brink J and Kelly P J 2009 Phys. Rev. B 79 195425
[8] Park J, Ahn Y H and Ruiz-Vargas C 2009 Nano Lett. 9 1742
[9] Xia F, Mueller T, Golizadeh-Mojarad R, Freitag M, Lin Y, Tsang J, Perebeinos V and Avouris P 2009 Nano Lett. 9 1039
2011, Vol. 28 
