Coexistence of Negative and Positive Photoconductivity in Few-Layer PtSe_2 Field-Effect Transistors

Grillo Alessandro; Faella Enver; Pelella Aniello; Giubileo Filippo; Ansari Lida; Gity Farzan; Hurley Paul K.; McEvoy Niall; Di Bartolomeo Antonio

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Coexistence of Negative and Positive Photoconductivity in Few-Layer PtSe_2 Field-Effect Transistors

机译：几层PTSE_2场效应晶体管中的负极和正光电导性的共存

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Platinum diselenide (PtSe2) field-effect transistors with ultrathin channel regions exhibit p-type electrical conductivity that is sensitive to temperature and environmental pressure. Exposure to a supercontinuum white light source reveals that positive and negative photoconductivity coexists in the same device. The dominance of one type of photoconductivity over the other is controlled by environmental pressure. Indeed, positive photoconductivity observed in high vacuum converts to negative photoconductivity when the pressure is raised. Density functional theory calculations confirm that physisorbed oxygen molecules on the PtSe2 surface act as acceptors. The desorption of oxygen molecules from the surface, caused by light irradiation, leads to decreased carrier concentration in the channel conductivity. The understanding of the charge transfer occurring between the physisorbed oxygen molecules and the PtSe2 film provides an effective route for modulating the density of carriers and the optical properties of the material.

机译：铂二硒化物（PtSe2）与超薄沟道区的场效应晶体管表现出p型导电率对温度和环境压力敏感。暴露于超连续白色光源揭示在同一设备正与负的光电导性并存。一种类型的光电导性的比其他优势是由环境压力来控制。实际上，正光电导在高真空中的换算结果为负的光电导观察时，压力升高。密度泛函理论计算确认的PtSe2表面充当受主的是物理吸附的氧分子。氧分子从表面脱附，造成通过光照射，导致在沟道导电率降低载流子浓度。物理吸附的氧分子和PtSe2膜之间发生的电荷转移的理解提供了用于调节的载体和该材料的光学性质的密度的有效路由。

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来源
《Advanced Functional Materials》 |2021年第43期|2105722.1-2105722.8|共8页
作者
Grillo Alessandro; Faella Enver; Pelella Aniello; Giubileo Filippo; Ansari Lida; Gity Farzan; Hurley Paul K.; McEvoy Niall; Di Bartolomeo Antonio;
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作者单位

Univ Salerno Phys Dept ER Caianiello Via Giovanni Paolo II 132 I-84084 Salerno Italy;

Univ Salerno Phys Dept ER Caianiello Via Giovanni Paolo II 132 I-84084 Salerno Italy;

Univ Salerno Phys Dept ER Caianiello Via Giovanni Paolo II 132 I-84084 Salerno Italy;

CNR SPIN Salerno Via Giovanni Paolo II 132 I-84084 Salerno Italy;

Univ Coll Cork Tyndall Natl Inst MicroNano Syst Ctr Cork T12 RSCP Ireland;

Univ Coll Cork Tyndall Natl Inst MicroNano Syst Ctr Cork T12 RSCP Ireland;

Univ Coll Cork Tyndall Natl Inst MicroNano Syst Ctr Cork T12 RSCP Ireland;

Trinity Coll Dublin AMBER Dublin D02 2 Ireland|Trinity Coll Dublin Sch Chem Dublin D02 2 Ireland;

Univ Salerno Phys Dept ER Caianiello Via Giovanni Paolo II 132 I-84084 Salerno Italy;

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正文语种 eng
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关键词
charge transfer; field-effect transistors; negative photoconductivity; oxygen adsorption; pressure; PtSe; (2);

机译：电荷转移;场效应晶体管;负光电导性;氧气吸附;压力;PTSE;（2）;

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Coexistence of Negative and Positive Photoconductivity in Few-Layer PtSe_2 Field-Effect Transistors

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