通过蓝光发射量子点的能量下移机制实现用于环境分析的紫外线 CMOS 图像传感器

IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY Journal of the Korean Physical Society Pub Date : 2024-08-08 DOI:10.1007/s40042-024-01132-5
Ui-Hyun Jeong, Jea-Gun Park
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引用次数: 0

摘要

最近,全球社会都在关注空气污染的治理问题。空气污染的测量根据污染物的不同采用不同的方法,包括臭氧(O3)的紫外线(UV)吸收法和二氧化硫(SO2)的荧光法。然而,由于硅对紫外线的量子效率(QE)较低,传统的硅基互补金属氧化物半导体图像传感器(Si-CIS)并不适用于紫外线测量。因此,不同类型的检测传感器被用于不同的空气污染物,导致测量位置受到限制,并因安装位置不同而产生误差。为了解决这些局限性,我们提出了一种量子点互补金属氧化物半导体图像传感器(QD-CIS),它能够利用量子点(QDs)的能量下移(EDS)机制对紫外线成像。合成的量子点吸收紫外波长的光,通过 EDS 将其转换为可见蓝光,并发出荧光。转换后的光强可通过 CIS 检测紫外线强度。通过设计的 QD-CIS 和紫外线 LED 照明,我们测量了对代表性空气污染物二氧化氮和二氧化硫浓度变化的灵敏度。结果显示,与传统的 CIS 相比,二氧化氮的灵敏度提高了 6.83 倍,二氧化硫的灵敏度提高了 21.39 倍。这表明紫外线成像技术有可能利用现有的 CIS 组件克服这些限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Ultraviolet CMOS image sensor for environment analysis via energy-down-shift mechanism of blue-light emitting quantum dots

Recently, there has been a global societal focus on the management of air pollution. Measurements of air pollution are conducted using various methods depending on the pollutants, including ultraviolet (UV) absorption methods for ozone (O3) and fluorescence methods for sulfur dioxide (SO2). However, the conventional silicon-based complementary metal–oxide–semiconductor image sensor (Si-CIS) is not suitable for UV measurements due to the low quantum efficiency (QE) of silicon for UV light. Consequently, different types of detection sensors are used for different air pollutants, leading to limitations in measurement locations and resulting in errors depending on the installation position. To address these limitations, we propose a quantum dot complementary metal–oxide–semiconductor image sensor (QD-CIS) capable of imaging UV light using the energy-down-shift (EDS) mechanism of quantum dots (QDs). The synthesized QDs absorb light at UV wavelengths, convert it into visible blue light through EDS, and emit luminescence. The converted intensity allows the detection of UV intensity by the CIS. Through the designed QD-CIS and UV LED illumination, we measured the sensitivity to changes in the concentrations of the representative air pollutants NO2 and SO2. The results showed a sensitivity increase of 6.83 times for NO2 and 21.39 times for SO2 compared to conventional CIS. This suggests the potential of UV imaging to overcome these limitations using existing CIS components.

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来源期刊
Journal of the Korean Physical Society
Journal of the Korean Physical Society PHYSICS, MULTIDISCIPLINARY-
CiteScore
1.20
自引率
16.70%
发文量
276
审稿时长
5.5 months
期刊介绍: The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.
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