Nano Res.
Electronic Supplementary Material
Theoretical study on two-dimensional MoS2 piezoelectric
nanogenerators
Yongli Zhou1,§, Wei Liu1,§ (), Xin Huang1,§, Aihua Zhang1, Yan Zhang2, and Zhong Lin Wang1,3 ()
1
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China
Institute of Theoretical Physics, and Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou
730000, China
3
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
§
These authors contributed equally to this work.
2
Supporting information to DOI 10.1007/s12274-015-0959-8
Figure S1 (a) The open-circuit voltage and surface piezocharge density of a single-layer MoS2 NG under the applied tensile strain up
to 15%. (b) The open-circuit voltage and surface piezocharge density of a single-layer MoS2 NG versus MoS2 flake length under a 15%
applied tensile strain. (c) The influence of the MoS2 layer number n on the NG open-circuit voltage and surface piezocharge under a
15% tensile strain. And (d) the dependence of the odd-layer NG capacitance on the flake length.
Address correspondence to Wei Liu, [email protected]; Zhong Lin Wang, [email protected]
Nano Res.
Figure S2 (a) A square-wave external strain (15%) applied on and released from the NG. And (b) corresponding short-circuit currents of
the odd-layer MoS2 NGs under the applied strain. Both figures give two cycles of the energy harvesting and conversion from the
mechanical to the electrical domain by the MoS2 NGs.
Figure S3 (a) The output peak current depends on the load resistance. (b) The output peak voltage across the resistor versus the external
resistance. (c) The output peak power on the load resistor as a function of the external resistance. And (d) the energy conversion efficiency
of the NG versus the layer number.
Figure S4 (a) Short-circuit current of the single-layer MoS2 NG under a 5 GHz square-wave applied tensile strain (15%). (b) Energy
conversion efficiency of the single-layer MoS2 NG versus the frequency of the square-wave applied strain.
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