Selectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity

被引：168

作者：

Yin, Jianbo ^{[1
]}

Wang, Huan ^{[1
]}

Peng, Han ^{[2
]}

Tan, Zhenjun ^{[1
,3
]}

Liao, Lei ^{[1
]}

Lin, Li ^{[1
]}

Sun, Xiao ^{[1
,3
]}

Koh, Ai Leen ^{[4
]}

Chen, Yulin ^{[2
]}

Peng, Hailin ^{[1
]}

Liu, Zhongfan ^{[1
]}

机构：

[1] Peking Univ, Beijing Sci & Engn Ctr Nanocarbons, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci,Ctr Nanochem, 202 Chengfu Rd, Beijing 100871, Peoples R China

[2] Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England

[3] Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China

[4] Stanford Univ, Stanford Nano Shared Facil, Stanford, CA 94305 USA

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

中国国家自然科学基金;

关键词：

SINGLE-CRYSTAL GRAPHENE; PHOTODETECTOR; PHOTOVOLTAGE; BANDGAP; GROWTH;

D O I：

10.1038/ncomms10699

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Graphene with ultra-high carrier mobility and ultra-short photoresponse time has shown remarkable potential in ultrafast photodetection. However, the broad and weak optical absorption (similar to 2.3%) of monolayer graphene hinders its practical application in photodetectors with high responsivity and selectivity. Here we demonstrate that twisted bilayer graphene, a stack of two graphene monolayers with an interlayer twist angle, exhibits a strong light-matter interaction and selectively enhanced photocurrent generation. Such enhancement is attributed to the emergence of unique twist-angle-dependent van Hove singularities, which are directly revealed by spatially resolved angle-resolved photoemission spectroscopy. When the energy interval between the van Hove singularities of the conduction and valance bands matches the energy of incident photons, the photocurrent generated can be significantly enhanced (up to similar to 80 times with the integration of plasmonic structures in our devices). These results provide valuable insight for designing graphene photodetectors with enhanced sensitivity for variable wavelength.

引用

页数：7

共 59 条

[1] Electronic Cooling in Graphene [J].

Bistritzer, R. ;

MacDonald, A. H. .

PHYSICAL REVIEW LETTERS, 2009, 102 (20)

[2] Ultrafast carrier dynamics and terahertz emission in optically pumped graphene at room temperature [J].

Boubanga-Tombet, S. ;

Chan, S. ;

Watanabe, T. ;

Satou, A. ;

Ryzhii, V. ;

Otsuji, T. .

PHYSICAL REVIEW B, 2012, 85 (03)

[3] Unraveling the Intrinsic and Robust Nature of van Hove Singularities in Twisted Bilayer Graphene by Scanning Tunneling Microscopy and Theoretical Analysis [J].

Brihuega, I. ;

Mallet, P. ;

Gonzalez-Herrero, H. ;

de laissardiere, G. Trambly ;

Ugeda, M. M. ;

Magaud, L. ;

Gomez-Rodriguez, J. M. ;

Yndurain, F. ;

Veuillen, J. -Y. .

PHYSICAL REVIEW LETTERS, 2012, 109 (19)

[4] Resonance effects on the Raman spectra of graphene superlattices [J].

Carozo, V. ;

Almeida, C. M. ;

Fragneaud, B. ;

Bede, P. M. ;

Moutinho, M. V. O. ;

Ribeiro-Soares, J. ;

Andrade, N. F. ;

Souza Filho, A. G. ;

Matos, M. J. S. ;

Wang, B. ;

Terrones, M. ;

Capaz, Rodrigo B. ;

Jorio, A. ;

Achete, C. A. ;

Cancado, L. G. .

PHYSICAL REVIEW B, 2013, 88 (08)

[5] Biased bilayer graphene: Semiconductor with a gap tunable by the electric field effect [J].

Castro, Eduardo V. ;

Novoselov, K. S. ;

Morozov, S. V. ;

Peres, N. M. R. ;

Dos Santos, J. M. B. Lopes ;

Nilsson, Johan ;

Guinea, F. ;

Geim, A. K. ;

Castro Neto, A. H. .

PHYSICAL REVIEW LETTERS, 2007, 99 (21)

[6] Theory of the Raman spectrum of rotated double-layer graphene [J].

Coh, Sinisa ;

Tan, Liang Z. ;

Louie, Steven G. ;

Cohen, Marvin L. .

PHYSICAL REVIEW B, 2013, 88 (16)

[7] Graphene bilayer with a twist: Electronic structure [J].

dos Santos, J. M. B. Lopes ;

Peres, N. M. R. ;

Castro Neto, A. H. .

PHYSICAL REVIEW LETTERS, 2007, 99 (25)

[8] Strong plasmonic enhancement of photovoltage in graphene [J].

Echtermeyer, T. J. ;

Britnell, L. ;

Jasnos, P. K. ;

Lombardo, A. ;

Gorbachev, R. V. ;

Grigorenko, A. N. ;

Geim, A. K. ;

Ferrari, A. C. ;

Novoselov, K. S. .

NATURE COMMUNICATIONS, 2011, 2

[9] Hot Carrier-Assisted Intrinsic Photoresponse in Graphene [J].

Gabor, Nathaniel M. ;

Song, Justin C. W. ;

Ma, Qiong ;

Nair, Nityan L. ;

Taychatanapat, Thiti ;

Watanabe, Kenji ;

Taniguchi, Takashi ;

Levitov, Leonid S. ;

Jarillo-Herrero, Pablo .

SCIENCE, 2011, 334 (6056) :648-652

[10] Chip-integrated ultrafast graphene photodetector with high responsivity [J].

Gan, Xuetao ;

Shiue, Ren-Jye ;

Gao, Yuanda ;

Meric, Inanc ;

Heinz, Tony F. ;

Shepard, Kenneth ;

Hone, James ;

Assefa, Solomon ;

Englund, Dirk .

NATURE PHOTONICS, 2013, 7 (11) :883-887

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