ferroelectric-tuned GeSe/MoS2 van der Waals heterojunction polarization photodetector
Source PDF · page 1RESEARCH PAPER
Ferroelectric-tuned van der Waals heterojunction with band alignment evolution
Yan Chen, Xudong Wang, Le Huang, Xiaoting Wang, Wei Jiang, Zhen Wang, Peng Wang, Binmin Wu, Tie Lin, Hong Shen, Zhongming Wei, Weida Hu, Xiangjian Meng, Junhao Chu, Jianlu Wang
Research context
Abstract Van der Waals integration with abundant two-dimensional materials provides a broad basis for assembling functional devices. In a specific van der Waals heterojunction, the band alignment engineering is crucial and feasible to realize high performance and multifunctionality. Here, we design a ferroelectric-tuned van der Waals heterojunction device structure by integrating a GeSe/MoS 2 VHJ and poly (vinylidene fluoride-trifluoroethylene)-based ferroelectric polymer. An ultrahigh electric field derived from the ferroelectric polarization can effectively modulate the band alignment of the GeSe/MoS 2 heterojunction. Band alignment transition of the heterojunction from type II to type I is demonstrated. The combination of anisotropic GeSe with MoS 2 realizes a high-performance polarization-sensitive photodetector exhibiting low dark current of approximately 1.5 pA, quick response of 14 μs, and high detectivity of 4.7 × 10 12 Jones. Dichroism ratios are also enhanced by ferroelectric polarization in a broad spectrum from visible to near-infrared. The ferroelectric-tuned GeSe/MoS 2 van der Waals heterojunction has great potential for multifunctional detection applications in sophi
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ferroelectric tuning drives a band-alignment transition from type II to type I
Source PDF · page 1approximately 1.5 pA dark current, 14 μs response and 4.7×10^12 Jones detectivity
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Yan Chen, Xudong Wang, Le Huang, Xiaoting Wang, Wei Jiang, Zhen Wang, Peng Wang, Binmin Wu, Tie Lin, Hong Shen, Zhongming Wei, Weida Hu, Xiangjian Meng, Junhao Chu, Jianlu Wang. Ferroelectric-tuned van der Waals heterojunction with band alignment evolution. Nature Communications (2021). https://doi.org/10.1038/s41467-021-24296-1
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