采用CQD/有机混合结构抑制杂散电子的高性能广谱光电探测器

IF 13.9 Q1 CHEMISTRY, MULTIDISCIPLINARY
Jiawei Qiao, Qian Wang, Jingjing Wang, Junwei Liu, Wenqing Zhang, Xunfan Liao, Long Ye, Hang Yin, Xiaotao Hao
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引用次数: 0

摘要

广谱光电探测器(pd)在各种健康监测、夜视和电信应用中是必不可少的,但它们在宽吸收区域的探测能力受到不良电子响应特性的限制。胶体量子点(CQDs)是一种很有前途的广谱检测系统,但其实际应用潜力受到次优暗电流特性的阻碍。为了克服这些挑战,我们提出了一种分层结构,包括CQDs和体异质结(BHJ)有机薄膜作为空穴传输层。PbS CQDs的集成提供了多种好处,包括带隙调谐以最小化热载流子,表面钝化以降低复合速率,以及与有机层形成高质量界面,这些都有助于通过抑制杂散电子来抑制暗电流泄漏和热激发。通过将ITIC集成到BHJ薄膜中,器件的可探测性显著增强,在400-1000 nm光谱范围内达到1013 Jones。这种改进是由于ITIC分子的最低未占据分子轨道(LUMO)更高,有效地阻碍了电子注入。此外,j聚集诱导的分子堆积和优化的BHJ膜的相分离也有助于提高性能。多种材料的集成为器件设计和功能提供了更大的灵活性,使开发更先进和复杂的光电器件成为可能。此外,该方法可以显著增强对光电器件工程的理论和实践理解,从而开发更先进的光电器件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

High-Performance Broad-Spectrum Photodetector by Suppressing Stray Electrons by Adopting a Hybrid CQD/Organic Architecture

High-Performance Broad-Spectrum Photodetector by Suppressing Stray Electrons by Adopting a Hybrid CQD/Organic Architecture

Broad-spectrum photodetectors (PDs) are essential for various health monitoring, night vision, and telecommunications applications, but their detectivity in a wide absorbance region is limited by undesirable electronic response properties. Colloidal quantum dots (CQDs) are a promising system for broad-spectrum detection, whereas their practical potential is hindered by suboptimal dark current characteristics. To overcome these challenges, we propose a layered architecture comprising CQDs and a bulk heterojunction (BHJ) organic film as a hole transport layer. The integration of PbS CQDs offers multiple benefits, including bandgap tuning for minimizing thermal carriers, surface passivation to reduce recombination rates, and the formation of high-quality interfaces with organic layers, which collectively contribute to suppressing dark current leakage and thermal excitations by suppressing stray electrons. By integrating ITIC into the BHJ film, the device detectability is significantly enhanced, reaching 1013 Jones in the 400–1000 nm spectral range. This improvement is attributed to the higher lowest unoccupied molecular orbital (LUMO) of ITIC molecules, which effectively hinders electron injection. Additionally, J-aggregation-induced molecular stacking and optimized phase separation of BHJ films contribute to the enhanced performance. The integration of diverse materials offers greater flexibility in device design and functionality, enabling the development of more advanced and sophisticated optoelectronic devices. Furthermore, this approach could significantly enhance the theoretical and practical understanding of optoelectronic device engineering, leading to the development of more advanced optoelectronic devices.

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CiteScore
17.40
自引率
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