Enhancing broadband absorption and photocurrent generation in carbon dots via P3HT integration

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2024-09-16 DOI:10.1016/j.optmat.2024.116129

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引用次数: 0

Abstract

The growing interest in carbon dots (CDs) arises from their diverse applications and unique properties. This study addresses challenges in CDs for photodetector (PD) applications, specifically surface defects and trap states hindering efficient charge transport. CDs/P3HT composites were prepared to overcome these issues by incorporating CDs in a poly(3-hexylthiophene) (P3HT) matrix. Broad absorption in spectroscopic characterization revealed its utility in fabricating a broadband PD. The CDs/P3HT PD displays a remarkable broadband photoresponse, spanning both UV and visible regions. The CDs and P3HT are effectively combined via non-covalent π-π interactions constituted by their conjugated systems. The π-π interaction increases electron delocalization and facilitates efficient charge transfer due to band alignment at the junction interface. Hence, fabricated CDs/P3HT PD demonstrated enhanced photocurrent compared to pure CDs, exhibiting high responsivity of 6.12 × 10⁻³ AW⁻¹ and detectivity of 0.69 × 10⁹ Jones. This study highlights the potential of CD/P3HT composites for broadband photodetector applications with enhanced photoelectric conversion.

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通过 P3HT 集成增强碳点的宽带吸收和光电流生成

碳点（CD）具有多种用途和独特性质，因此越来越受到人们的关注。本研究探讨了 CD 在光电探测器 (PD) 应用中面临的挑战，特别是阻碍电荷高效传输的表面缺陷和陷阱态。为了克服这些问题，我们在聚(3-己基噻吩)（P3HT）基质中加入了 CD，制备了 CD/P3HT 复合材料。光谱表征中的广泛吸收显示了其在制造宽带 PD 中的实用性。CD/P3HT PD 显示出显著的宽带光响应，跨越紫外和可见光区域。CD 和 P3HT 通过其共轭体系构成的非共价 π-π 相互作用有效地结合在一起。π-π 相互作用增加了电子逸散，并通过结界面的带对齐促进了有效的电荷转移。因此，与纯 CD 相比，制备的 CD/P3HT PD 显示出更强的光电流，具有 6.12 × 10-3 AW-1 的高响应度和 0.69 × 109 Jones 的检测度。这项研究凸显了 CD/P3HT 复合材料在宽带光电探测器应用中的潜力，并增强了光电转换能力。

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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.