DataVXAdvanced MaterialsPaper
journal article·2024-05

Planar Cation Passivation on Colloidal Quantum Dots Enables High‐Performance 0.35–1.8 µm Broadband TFT Imager

Yuxuan Liu, Jing Liu, Chengjie Deng, Bo Wang, Bing Xia, Xinyi Liang, Yang Yang, Shengman Li, Xihua Wang, Luying Li, Xinzheng Lan, Peng Fei, Jianbing Zhang, Liang Gao, Jiang Tang

Advanced Materials· Volume 36· Issue 21
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Source abstract

Abstract

Abstract Solution‐processed colloidal quantum dots (CQDs) are promising candidates for broadband photodetectors from visible light to shortwave infrared (SWIR). However, large‐size PbS CQDs sensitive to longer SWIR are mainly exposed with nonpolar (100) facets on the surface, which lack robust passivation strategies. Herein, an innovative passivation strategy that employs planar cation, is introduced to enable face‐to‐face coupling on (100) facets and strengthen halide passivation on (111) facets. The defect density of CQDs film (Eg ≈ 0.74 eV) is reduced from 2.74 × 1015 to 1.04 × 1015 cm−3, coupled with 0.1 eV reduction in the activation energy of defects. The resultant CQDs photodiodes exhibit a low dark current density of 14 nA cm−2 with a high external quantum efficiency (EQE) of 62%, achieving a linear dynamic range of 98 dB, a −3dB bandwidth of 103 kHz and a detectivity of 4.7 × 1011 Jones. The comprehensive performance of the CQDs photodiodes outperforms previously reported CQDs photodiodes operating at >1.6 µm. By monolithically integrated with thin‐film transistor (TFT) readout circuit, the broadband CQDs imager covering 0.35‐1.8 µm realizes the functions including silicon wafer perspectivity and material discrimination, showing its potential for wide range of applications.
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Research context

Electronic materials

OpenAlex topics: Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films · Nanowire Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 P. R. China

Optics Valley Laboratory 1037 Luoyu Road Wuhan 430074 P. R. China

Wenzhou Advanced Manufacturing Technology Research Institute Huazhong University of Science and Technology 225 Chaoyang New Street Wenzhou 325035 P. R. China

Key Laboratory for Micro‐Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and Chemometrics College of Materials Science and Engineering Hunan University Changsha 410082 China

Hunan Institute of Optoelectronic Integration Hunan University Changsha 410082 China

Department of Electrical and Computer Engineering University of Alberta Edmonton T6G 2V4 Canada

Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen Guangdong 518057 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Science, Technology and Innovation Commission of Shenzhen Municipality · China Postdoctoral Science Foundation

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