Double-Heterojunction-Based HgTe Colloidal Quantum Dot Imagers

IF 15.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Nano Pub Date : 2025-02-27 DOI:10.1021/acsnano.4c17257

Huicheng Hu, Jing Liu, Jing Liu, Mohan Yuan, Haifei Ma, Binbin Wang, Ya Wang, Hang Xia, Junrui Yang, Liang Gao, Jianbing Zhang, Jiang Tang, Xinzheng Lan

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Abstract

Photodetectors based on HgTe colloidal quantum dots (CQDs) are expected to enable the next generation of infrared detection technology due to their low-cost preparation, widely tunable absorption, and direct integration with Si-based electronics. However, the fabrication of HgTe CQD photodiode focal plane arrays (FPAs) has been hampered by the creation of rectifying homojunctions through delicate doping modulation and the time-consuming layer-by-layer assembly of the QD photoactive layer. Herein we address these challenges by exploring energetically favored ZnO/HgTe/ZnTe double heterojunctions (DH), and by forming colloidally stable HgTe ink that enables one-step direct film deposition. The DH HgTe CQD photodiode operates over a broad spectral range from 400 to 1800 nm, comparable to that of uncooled InGaAs detectors, with a record peak EQE of 56% at 1600 nm. A short-wave infrared (SWIR) imager has been finally demonstrated through monolithic integration with a CMOS readout integrated circuit (ROIC) comprising 640 × 512 pixels. The DH architecture is beneficial for the construction of high-performance HgTe CQD photodiodes compatible with silicon chip integration.

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来源期刊

ACS Nano 工程技术-材料科学：综合

CiteScore

26.00

自引率

4.10%

发文量

1627

审稿时长

1.7 months

期刊介绍： ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.