Filter-Free Narrowband Photodetectors Employing Colloidal Quantum Dots

Xiong, Qiuyang; Chowdhury, Farsad Imtiaz; Wang, Xihua

doi:10.1109/jstqe.2017.2776522

Cited by 11 publications

(7 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This CCN concept has been successfully applied to various types of photodetectors, such as those based on perovskite films, perovskite single crystals, colloidal quantum dots (QDs), and organic films. [ 30,31,57–62 ]…”

Section: Unconventional Image Sensors For Machine Visionmentioning

confidence: 99%

Unconventional Image‐Sensing and Light‐Emitting Devices for Extended Reality

Park

Seung

Kim

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Extended reality (XR) refers to a space where physical and digital elements coexist and comprises three elements, namely, environment, human, and computer, which interact with each other. Image sensors and displays are the core elements of XR systems because visual information is important for recognizing and judging objects. Recently, new features of image sensors and displays that are useful for developing next‐generation XR systems have been reported. For example, a miniaturized version of image sensors with the superb object detection and recognition capability offers new opportunities for machine vision technology. Furthermore, transparent and deformable displays are the key components of XR systems because they not only provide highly realistic virtual image information but also serve as efficient user interfaces. Herein, the recent progresses in such unconventional image sensors and display technologies are reviewed. First, image sensors with features of wavelength‐selective photodetection for color discrimination, neuromorphic image acquisition for facile pattern recognition, and curved image sensor designs inspired by biological eyes for miniaturization and unconventional imaging performances are discussed. Then, light‐emitting device technologies focusing on devices with transparency and deformable form factors are described. Finally, the review is concluded with a brief summary and a future outlook.

show abstract

Section: Unconventional Image Sensors For Machine Visionmentioning

confidence: 99%

Unconventional Image‐Sensing and Light‐Emitting Devices for Extended Reality

Park

Seung

Kim

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…Benefited from the self-driving effect of p−n junction, the device has a responsivity (R) of 114 mA/W at zero bias, under 1064 nm light illumination. What is more, the CuGaTe 2 /silicon heterojunction device can markedly suppress the dark current, resulting in a large on/off ratio of ∼10 4 and a high specific detectivity of ∼10 12 Jones. The mechanism of the narrowband CuGaTe 2 /Si photodetector can be applied to control the photoresponse of other photodetector based on p−n junction, which is very useful to improve the noise immunity of the image sensor system.…”

Section: ■ Conclusionmentioning

confidence: 99%

“…As the core component of an IR imaging system, narrowband photodetector with sound spectral selectivity is of paramount importance to suppress the interference of the signal from obtrusive light. To date, narrow-band detectors have been achieved generally through using the combination of broadband photodiodes and optical filters, , bulk heterojunction based on the charge collection narrowing mechanism, − nanowire arrays, , an active layer with narrowband absorption, − and hot carrier generation with enhanced absorption in special range. , These approaches indeed can achieve photodetectors with reliable narrow band; however, these narrow band devices are usually complex in geometries, which will lead to relatively high fabrication cost, or unstable performance for their organic photo-active layers. , What is more, because these devices usually need an external power supply during operation, which means that they will consume energy in comparison with other self-driven photodetectors.…”

Section: Introductionmentioning

confidence: 99%

Self-Powered Filterless Narrow-Band p–n Heterojunction Photodetector for Low Background Limited Near-Infrared Image Sensor Application

Wang

Zhen

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Photonic detection with narrow spectrum selectivity is very important to eliminate the signal from obtrusive light, which can improve the anti-interference ability of the infrared imaging system. While the self-driving effect inherent to the p−n junction is very attractive in optic-electronic integration, the application of the p−n junction in narrow-band photodetectors is limited by the usual broad absorption range. In this work, a self-powered filterless narrowband near-infrared photodetector based on CuGaTe 2 /silicon p−n junction was reported. The as-fabricated photodetector exhibited typical narrow-band response which shall be ascribed to the slightly smaller band gap of Si than CuGaTe 2 and the restricted photocurrent generation region in the p−n heterojunction by optimizing CuGaTe 2 thickness. It is observed that when the thickness of CuGaTe 2 film is 143 nm, the device exhibits a response peak centered around 1050 nm with a full-width at half-maximum of ∼118 nm. Further device analysis reveals a specific detectivity of ∼10 12 Jones and a responsivity of 114 mA/W under 1064 nm illumination at zero bias. It was also found that an image system based on the narrowband CuGaTe 2 /Si photodetector showed high noise immunity for its spectral selective characteristics.

show abstract

“…One way around these deficiencies is to use alternative photosensor materials [11]. The three main classes of materials that have been explored include organic semiconductors (OSCs) [12][13][14][15][16], perovskites [17][18][19][20] and, to a lesser extent, colloidal quantum dots (QDs) [21][22][23]. Since OSCs and perovskites are more established as color-sensitive photodetectors, the focus of this paper will only be on OSC and perovskite image sensors.…”

Section: Introductionmentioning

confidence: 99%

Frontiers in Photosensor Materials and Designs for New Image Sensor Applications

2021

View full text Add to dashboard Cite

Certain applications of image sensors require capabilities that are beyond the technology of current image sensors such as automated quality inspection systems based on color discrimination under varying levels of illumination. This paper serves to provide a brief overview of image sensor technologies involving the use of alternative photosensor materials (organic semiconductors and perovskites) being developed to meet these needs. The discussion around such developments is typically confined to chemistry and physics "silos"; by publishing in this special edition, the authors hope to bridge the knowledge gap between scientists developing new photosensor materials and engineers developing image sensors for new machine vision systems.

show abstract

Filter-Free Narrowband Photodetectors Employing Colloidal Quantum Dots

Cited by 11 publications

References 26 publications

Unconventional Image‐Sensing and Light‐Emitting Devices for Extended Reality

Unconventional Image‐Sensing and Light‐Emitting Devices for Extended Reality

Self-Powered Filterless Narrow-Band p–n Heterojunction Photodetector for Low Background Limited Near-Infrared Image Sensor Application

Frontiers in Photosensor Materials and Designs for New Image Sensor Applications

Contact Info

Product

Resources

About