期刊
NANO RESEARCH
卷 10, 期 10, 页码 3476-3485出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1559-6
关键词
graphene; ZnO nanowire; vdW heterostructure; strain modulation; photosensor
类别
资金
- National Basic Research Program of China [2013CB932602]
- National Key Research and Development Program of China [2016YFA0202701]
- Program of Introducing Talents of Discipline to Universities [B14003]
- National Natural Science Foundation of China [51672026, 51602020, 51527802, 51232001]
- China Postdoctoral Science Foundation [2015M580981, 2016T90033]
- Beijing Municipal Science & Technology Commission
- State Key Laboratory for Advanced Metals and Materials [2016Z-06]
- Fundamental Research Funds for the Central Universities [FRF-TP-15-075A1, FRF-BR-15-036A, FRF-AS-15-002]
The mixed-dimensional van der Waals (vdW) heterostructure is a promising building block for strained electronics and optoelectronics because it avoids the bond fracture and atomic reconstruction under strain. We propose a novel mixed-dimensional vdW heterostructure between two-dimensional graphene and a one-dimensional ZnO nanowire for high-performance photosensing. By utilizing the piezoelectric properties of ZnO, strain modulation was accomplished in the mixed-dimensional vdW heterostructure to optimize the device performance. By combining the ultrahigh electrons transfer speed in graphene and the extremely long life time of holes in ZnO, an outstanding responsivity of 1.87 x 10(5) A/W was achieved. Under a tensile strain of only 0.44% on the ZnO nanowire, the responsivity was enhanced by 26%. A competitive model was proposed, in which the performance enhancement is due to the efficient promotion of the injection of photogenerated electrons from the ZnO into the graphene caused by the strain-induced positive piezopotential. Our study provides a strain-engineering strategy for controlling the behavior of the photocarriers in the mixed-dimensional vdW heterostructure, which can be also applied to other similar systems in the future.
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