基于AsP/MoS<sub>2</sub>异质结的偏振光电探测器

任智慧; 钟绵增; 杨珏晗; 魏钟鸣

doi:10.37188/CO.2020-0189

基于AsP/MoS₂异质结的偏振光电探测器

doi: 10.37188/CO.2020-0189

任智慧^{1, 2,},
钟绵增^3,,
杨珏晗^1,,
魏钟鸣^{1, 2, ,}

1.
中国科学院半导体研究所半导体超晶格国家重点实验室，北京 100083
2.
中国科学院大学材料与光电研究中心，北京 100049
3.
中南大学物理与电子学院先进材料超微结构与超快过程研究所，长沙 410083

基金项目: 国家重点研发计划（No. 2017YFA0207500）；国家自然科学基金（No. 62004193）；北京分子科学国家实验室（No. BNLMS201908）

详细信息

作者简介:
任智慧（1997—），女，吉林长春人，硕士研究生，主要进行低维材料偏振性能方面的研究。E-mail：rzh@semi.ac.cn

钟绵增（1987—），男，山东潍坊人，博士，副教授，主要从事低维半导体材料生长与光电器件研究。E-mail：zmzhong@csu.edu.cn

杨珏晗（1987—），男，山西太原人，博士，助理研究员，主要从事二维半导体和氧化物半导体的功能器件设计。E-mail：yjhyjg@semi.ac.cn

魏钟鸣（1984—），男，湖北仙桃人，博士，研究员，博士生导师，主要从事低维半导体光电器件方面的研究。E-mail：zmwei@semi.ac.cn

中图分类号: O436
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出版历程
- 收稿日期: 2020-10-21
- 修回日期: 2020-11-12
- 网络出版日期: 2020-12-19
- 刊出日期: 2021-01-25

A polarization-sensitive photodetector based on a AsP/MoS₂ heterojunction

REN Zhi-hui^{1, 2
,},
ZHONG Mian-zeng^3
,,
YANG Jue-han^1
,,
WEI Zhong-ming^{1, 2
, ,}

1.
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3.
Hunan Key Laboratory of Super-microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, China

Funds: National Key Research and Development Program of China (No. 2017YFA0207500); the National Natural Science Foundation of China (No. 62004193); Beijing National Laboratory for Molecular Sciences (No. BNLMS201908)

More Information

Corresponding author: zmwei@semi.ac.cn

摘要

摘要: 线偏振光的探测能力是评价偏振光电探测器件的重要指标。黑砷磷（AsP）是一种较为稳定的平面内各向异性材料，由于其面内结构各向异性，其对线偏振光较为敏感，在偏振探测领域有着重要的应用潜力。本文介绍了一种基于AsP/MoS₂的高度偏振敏感光电探测器。由于AsP各向异性的光吸收、MoS₂有效的载流子收集和输运能力以及范德华异质结对暗电流的抑制作用，该光电探测器实现了大于300的电流开关比，0.27 A/W的电流光响应度以及2×10¹⁰ Jones的比探测率。更重要的是，此类光电探测器在638 nm波段实现了高达3.06二向色性比的偏振特性。这些实验结果表明AsP/MoS₂异质结构在偏振光电探测领域有着广阔的应用前景。
- 光电探测器 /
- 黑砷磷 /
- 异质结 /
- 偏振特性
Abstract: The ability to detect linearly polarized light is an important index for evaluating polarized photoelectric detectors. Black arsenic phosphorus (b-AsP) is a relatively stable anisotropic material, and is sensitive to linearly polarized light because of its anisotropy inside its planar structure. The material has important application value in polarization detection. This paper introduces a polarization-sensitive photodetector based on AsP/MoS₂. Due to the anisotropic light absorption of AsP, effective carrier collection and strong carrier transport capacity of MoS₂, as well as the suppression of dark current by a van der Waals heterojunction, the performance of the photodector shows relatively large on/off ratios. Moreover, the photodector has a current optical responsivity of 0.27 A/W and a detectivity of 2×10¹⁰ Jones, and more importantly, achieves a dichroic ratio of up to 3.06 at 638 nm. These experimental results show that AsP/MoS₂ heterostructures have broad application prospects in the field of polarized photoelectricity detection.
- photodetectors /
- black arsenic phosphorus /
- heterojunction /
- polarization characteristics

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图 1 异质结制备示意图。(a)机械剥离后通过PDMS干法转移制备异质结流程图；(b)异质结构示意图；(c)异质结显微形貌图

Figure 1. Schematic diagram of heterojunction preparation. (a) Flow chart of preparing a heterojunction by PDMS dry-transfer after mechanical stripping; (b) schematic diagram of the transferred heterojunction structure; (c) microscopic morphology of the heterojunction

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图 2 异质结表征。(a) MoS₂和(b) AsP块状材料的XPS能谱；(c) 不同材料的拉曼光谱，插图为不同情况下的拉曼成像图；(d) 异质结在不同偏振光角度下的吸光度随波长变化曲线；(e) 异质结对638 nm波段的光吸收能力随入射线偏振光角度的变化曲线

Figure 2. Characterization of heterojunctions. XPS energy spectra of (a) MoS₂ and (b) AsP bulk materials; (c) raman spectra of MoS₂ and AsP, where the illustrations are Raman mapping diagrams under different conditions; (d) absorbance of the heterojunction varies with wavelengths under different polarized light angles; (e) absorption coefficient of the heterojunction at the 638 nm wavelength varies with the angle of linearly polarized light

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图 3 器件制备与测试。(a) 器件制备；(b) 器件偏振测试光路图

Figure 3. The fabrication and test of the device. (a) Device preparation; (b) optical path diagram for polarization measurement

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图 4 (a)测试器件示意图；(b)器件所用异质结各组分厚度，插图为异质结的原子显微图像（AFM）；(c)器件伏安特性曲线（红色曲线为取对数后暗电流随电压变化情况）；(d)栅压变化对伏安特性曲线的影响；(e)两种材料的能带排列（黑色水平线是真空能级）；(f)正偏压下异质结的理想能带图；(g)栅压为正时，异质结正偏情况下的能带示意图

Figure 4. (a) Schematic diagram of the test device; (b) The component thickness of the heterojunction, illustrated by the Atomic Microscopic Image (AFM) of the heterojunction; (c) volt-ampere characteristics curve of the device (the red curve is the change in the dark current with voltage in a logarithmic ordinate); (d) influence of gate pressure changes on the volt-ampere characteristics curve; (e) band alignment of the two materials (the black horizontal line is the vacuum level); (f) ideal energy band diagram of the heterojunction under positive bias; (g) energy band diagram where there is positive bias in the heterojunction when the gate pressure is positive

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图 5 (a)不同光强下器件的伏安特性曲线；(b)不同光强下器件电流随时间变化曲线；(c)器件开关比随入射光强及源漏电压变化情况；(d)重复开关50次器件电流随时间的变化情况（V_ds= 1 V, V_gs= 0 V）。

Figure 5. (a) The volt-ampere characteristics curve of the device under different power densities; (b) current of the device varies with time under different power densities; (c) switching ratio as it varies with the power density of the incident light and the source-drain voltage; (d) variation of the device current over time when the switch is repeated 50 times (V_ds= 1 V, V_gs= 0 V).

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图 6 (a)短路电流，(b)源漏电压分别为正负1 V时光电流，(c)响应率以及(d)器件外量子效率和探测率随入射光功率密度变化曲线

Figure 6. The curve of the (a) short circuit current, (b) photocurrent when the voltage is plus or minus 1 V, (c) responsivity, (d) external quantum efficiency and detectivity varying with the incident light power density

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图 7 (a)偏光显微镜下水平夹角变化对材料颜色明暗的影响；(b)偏振测试时材料不同轴向的相对位置；(c)器件输出电流随入射偏振光与水平夹角变化；(d)偏振电流的各向异性响应随电压变化；(e)不同线偏振光下角分辨光电流随角度变化

Figure 7. (a) Influence of changes in the angle of polarization of the incident light on the shade of material color under a polarized light microscope; (b) axial directions of AsP during the polarization test;(c) variation curve of the current with the incident angle of polarized light; (d) anisotropic response of the polarized photocurrent varies with voltage; (e) photocurrent varies with the angle under different linearly polarized lights

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