Tunable Bi-directional Photoresponse in Hybrid PtSe(2?x) Thin Films Based on Precisely Controllable Selenization Engineering

Yunlu Lian; Jiayue Han; Ming YangSilu PengChaoyi ZhangChao HanXingchao ZhangXianchao LiuHongxi ZhouYang WangChangyong LanJun GouYadong JiangYulong LiaoHe YuJun Wang

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Tunable Bi-directional Photoresponse in Hybrid PtSe(2?x) Thin Films Based on Precisely Controllable Selenization Engineering

机译：Tunable Bi-directional Photoresponse in Hybrid PtSe(2?x) Thin Films Based on Precisely Controllable Selenization Engineering

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Bi-directional photodetection with positive and negative photoconductance(PPC/NPC) plays a critical role in building next-generation artificial neuromorphicsystems, visual information processing and optoelectronic logic gatesof the future. However, the typical device configuration based on heterostructureswith strict working principles restricts the diversity of materialselection. In this work, a novel strategy is proposed to fabricate bi-directionalphotoresponse devices based on PtSe_(2?x) films with precisely controllableselenization engineering. It is found that the PtSe_(2?x) films are composed ofPt and PtSe_2 components. The direction of the photocurrent can be reversiblymodulated in a broadband range by tuning the ratio of PtSe_2 in the film,which is ascribed to the synergistic mechanism of bolometric effect of Pt andphotoconductive effect of PtSe_2. The polarity switching wavelength from NPCto PPC can be further modulated through tuning the components of the filmfor specific demand. The tunable bi-directional photoresponse enables thedevice to mimic the fundamental functions of artificial synapses all optically,such as aversion learning capability and logical functions, with high pairedpulse facilitation index. This work potentially opens an opportunity for thedevelopment of advanced artificial neuromorphic systems and optoelectroniclogic gates.

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来源
《Advanced functional materials》 |2022年第35期|2205709.1-2205709.10|共10页
作者
Yunlu Lian; Jiayue Han; Ming YangSilu PengChaoyi ZhangChao HanXingchao ZhangXianchao LiuHongxi ZhouYang WangChangyong LanJun GouYadong JiangYulong LiaoHe YuJun Wang;
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作者单位

State Key Laboratory of Electronic Thin Films and Intergrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054, China;

State Key Laboratory of Electronic Thin Films and Intergrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054, China Institute of Electronic and Electrical EngineeringCivil Aviation Flight University of ChinaGuanghan 618307,;

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正文语种英语
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artificial synapses; bi-directional; photoresponse; selenization engineering;

Tunable Bi-directional Photoresponse in Hybrid PtSe(2?x) Thin Films Based on Precisely Controllable Selenization Engineering

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