Research / 2019 / Article / Fig 2

Review Article

Emerging Devices Based on Two-Dimensional Monolayer Materials for Energy Harvesting

Figure 2

Piezoelectric nanogenerators based on monolayer 2-D materials. (a–c) Operation scheme of PENG based on the monolayer MoS2. The transparent device with monolayer MoS2 shows the highest output performance. Reproduced with permission from the Nature Publishing Group [62]. (d, e) Probing the piezoelectric property of free-standing monolayer MoS2. Reproduced with permission from the Nature Publishing Group [63]. (f) Voltage output performance determined by different directions of MoS2 grown by the CVD method on a Si substrate. Reproduced with permission from Elsevier Ltd. [64]. (g, h) Sulfur treatment enhanced the output performance of PENG based on the monolayer MoS2. Reproduced with permission from Wiley-VCH [65]. (i, j) PENG based on mono/bilayer WSe2 synthesized via CVD and turbostratic stacking. Reproduced with permission from Wiley-VCH [66].