Optimizing Light Sensing Capabilities of WSe2 FETs through Chemical Modulation of Carrier Dynamics

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2024-11-23 DOI:10.1016/j.optmat.2024.116489

Sobia Nisar , Ghulam Dastgeer , Muhammad Shahzad Zafar , Muhammad Wajid Zulfiqar , Amina Musarat , Iqra Rabani , Muhammad Zahir Iqbal

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Abstract

Two-dimensional semiconductor materials demonstrate interesting electronic and optoelectronic properties, which can be further modulated through chemical doping to control carrier concentration and enhance device performance. This study explores the doping process of a few-layer thin WSe₂ using FeCl₃ solution as a dopant. We perform a thorough characterization utilizing Raman analysis and electrical testing to validate the doping of WSe₂. The investigations reveal the p-type doping effect and a notable rise in hole concentration, further elucidated via the energy band diagram. Additionally, the WSe2 field-effect transistor (FET) operation is investigated under illumination with light of different wavelengths ranging from 220 nm to 514 nm both before and after doping. Following p-type doping, the device exhibited a notable increase in current, indicative of improved performance in photodetection. The responsivity and external quantum efficiency (EQE) are improved significantly after doping. This research confirms the effectiveness of p-type doping in WSe₂ and highlights its impact in enhancing the electronic and optoelectronic characteristics of WSe₂ devices. The results underscore the potential for advancing electronic and optoelectronic applications through such enhancements.

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通过载流子动力学化学调制优化 WSe2 FET 的光传感能力

二维半导体材料具有有趣的电子和光电特性，可通过化学掺杂进一步调控这些特性，从而控制载流子浓度并提高器件性能。本研究探讨了使用 FeCl3 溶液作为掺杂剂对几层薄的 WSe2 进行掺杂的过程。我们利用拉曼分析和电气测试进行了全面的表征，以验证 WSe2 的掺杂。研究发现了 p 型掺杂效应和空穴浓度的显著上升，并通过能带图进一步阐明了这一点。此外，还研究了 WSe2 场效应晶体管（FET）在掺杂前后在 220 纳米到 514 纳米不同波长光照下的工作情况。掺杂 p 型后，该器件的电流明显增加，表明光电探测性能得到改善。掺杂后，响应率和外部量子效率（EQE）都有显著提高。这项研究证实了在 WSe2 中进行 p 型掺杂的有效性，并强调了其在增强 WSe2 器件的电子和光电特性方面的影响。研究结果强调了通过这种增强来推进电子和光电应用的潜力。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.