Silver Selenide Colloidal Quantum Dots for Mid-Wavelength Infrared Photodetection

Hafiz, Shihab Bin; Scimeca, Michael R.; Zhao, Pan; Paredes, Ingrid J.; Sahu, Ayaskanta; Ko, Dong Kyun

doi:10.1021/acsanm.9b00069

Cited by 60 publications

(71 citation statements)

References 31 publications

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“…In this regard, Ag 2 Se QDs having a small bandgap and an absorption wavelength up to 6.5 μm are an attractive material for the targeted applications (Sahu et al, 2012). A precise doping of QDs has been suggested to have electrons filled up in the 1S e state to prompt intraband absorption between the 1S e and 1P e state (Hafiz et al, 2019). This novel strategy will open up great opportunities of IR PDs that go beyond traditional interband absorption.…”

Section: Discussionmentioning

confidence: 99%

“…However, the device exhibited very limited photoresponse performance and bias stability below 200 mV, which might be caused by the reduction of Ag + . Similarly, Hafiz et al (2019) fabricated a PD based on Ag 2 Se QDs (Figure 8B) and investigated the effect of ligand exchange on photoresponse performance. The fabricated Ag 2 Se QDs had excess electrons which were located at the first conduction energy level (1S e ).…”

Section: Other Types Of Quantum Dotsmentioning

confidence: 99%

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Toward Green Optoelectronics: Environmental-Friendly Colloidal Quantum Dots Photodetectors

Miao

Cho

2021

Front. Energy Res.

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Colloidal quantum dots (CQDs) have attracted tremendous research interests in future-generation energy, electronic, optoelectronic, and bio-imaging applications due to their fascinating material properties, such as solution processability at room temperature and under ambient conditions, compatibility with various functional materials, and high photostability as well as photosensitivity. Among the various optoelectronic applications of CQDs, optical light sensors, which convert photonic energy into electrical signals, have been of particular interest because they are one of the key building blocks for modern communication and imaging applications, including medical X-ray and near-infrared imaging, visible light cameras, and machine vision. However, CQDs, which have been widely researched for photodetectors (PDs) so far, contain toxic and hazardous heavy metals, namely, lead (Pb), cadmium (Cd), and mercury (Hg). These substances are extremely toxic and harmful to the environment as well as human beings. Therefore, it is highly desirable to substitute CQDs containing heavy metals with nontoxic and environmentally friendly ones to realize green optoelectronics. In this review article, we introduce various kinds of heavy metal–free CQDs and their PD applications. This article comprehensively includes working mechanisms of PDs, various kinds of nontoxic and environmentally friendly CQD-based PDs, advanced heterojunction PDs, and discussion for future perspectives.

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Section: Discussionmentioning

confidence: 99%

Section: Other Types Of Quantum Dotsmentioning

confidence: 99%

Toward Green Optoelectronics: Environmental-Friendly Colloidal Quantum Dots Photodetectors

Miao

Cho

2021

Front. Energy Res.

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“…The narrow bandgap interband transitions in CQD tend to require heavy elements, yet the heavy elements are toxic [134,135], particularly concerning when they need to be incorporated in health care and wearable electronics. Non-toxic CQDs for IR light sensing and imaging are under rapid progress, e.g., narrow bandgap III-V material (InAs [136][137][138], InSb [139]) based CQDs, silver chalcogenide CQDs [135,[140][141][142]. The III-V semiconducting CQDs are emerging, but with limited photoresponse up to SWIR [134,138].…”

Section: Zero Dimensional Nanocrystalsmentioning

confidence: 99%

Solution-processable infrared photodetectors: Materials, device physics, and applications

Paramasivam

Vella

et al. 2021

Materials Science and Engineering: R: Reports

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This review is written to introduce infrared photon detectors based on solution-processable semiconductors. A new generation of solution-processable photon detectors have been reported in the past few decades based on colloidal quantum dots, two-dimensional materials, organics semiconductors, and perovskites. These materials offer sensitivity within the infrared spectral regions and the advantages of ease of fabrication at low temperature, tunable materials properties, mechanical flexibility, scalability to large areas, and compatibility with monolithic integration, rendering them as promising alternatives for infrared sensing when compared to vacuum-processed counterparts that require rigorous lattice matching during integration. This work focuses on infrared detection using disordered semiconductors so as to articulate how the inherent device physics and behaviors are different from conventional crystalline semiconductors. The performance of each material family is summarized in tables, and device designs unique to solution-processed materials, including narrowband photodetectors and pixel-less up-conversion imagers, are highlighted in application prototypes distinct from conventional infrared cameras. We share our perspectives in examining open challenges for the development of solution-processable infrared detectors and comment on recent research directions in our community to leverage the advantages of solutionprocessable materials and advance their implementation in next-generation infrared sensing and imaging applications.among many other areas. Commercially available IR detectors are predominantly based on vacuum-processed inorganic compound semiconductors, which are structurally rigid, brittle, and require fabrication via complex epitaxial growth and costly processes. A new generation of solution-processable semiconductors have been reported in the past few decades including colloidal quantum dots (CQDs) [1,8,9], organic semiconductors (OSCs) [4,7,10,11], perovskites [1,12,13], and two-dimensional (2D) materials [5,14]. These materials offer sensitivity within the IR spectral regions and the advantages of ease of fabrication

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“…[ 126 ] More recently, new material synthesis toward less‐toxic and more efficient synthesis of QDs has been reported. For example, indium arsenide (InAs) QDs, [ 127 ] indium phosphide (InP) QDs, [ 128–131 ] and silver selenide (Ag 2 Se) QDs [ 132–136 ] were developed to replace the toxic heavy metal components ( Figure ). However, the optoelectronic performances are still inferior to the heavy metal‐based QDs, requiring further studies to improve the efficiency as well as the cost‐effective synthesis routes.…”

Section: Materials Design Of Qds For Photonic Devicesmentioning

confidence: 99%

Recent Progress of Quantum Dot‐Based Photonic Devices and Systems: A Comprehensive Review of Materials, Devices, and Applications

et al. 2020

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Recently, photonic technologies have attracted lots of interests in the demand of high‐performance sensor devices. In particular, multifunctional photodetectors based on low‐dimensional nanomaterials have enabled to address complex environmental conditions and data processing for wide range of emerging applications, such as soft robotics, biomedical devices, and neuromorphic computing hardware, translating into mechanically flexible platforms that can offer reliable information. Semiconducting quantum dots (QDs) are one of the promising candidates for such photonic applications due to their excellent optical absorption coefficient, wide bandgap tunability, and structural stability as well as high‐throughput production capabilities, such as low‐cost, large‐area, and complementary metal–oxide–semiconductors (CMOS) compatible solution processability. Herein, essential investigations of the emerging photonic devices and systems are presented, focusing on materials, devices, and applications. In addition, diverse hybrid device architectures, which integrate the QD materials with various semiconductors, are fully examined to introduce the newly developed high‐performance wearable photodetectors and neuromorphic applications. Finally, research challenges and opportunities of the QD‐based photonic devices are also discussed, keeping forward‐looking perspective and system points of view.

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Silver Selenide Colloidal Quantum Dots for Mid-Wavelength Infrared Photodetection

Cited by 60 publications

References 31 publications

Toward Green Optoelectronics: Environmental-Friendly Colloidal Quantum Dots Photodetectors

Toward Green Optoelectronics: Environmental-Friendly Colloidal Quantum Dots Photodetectors

Solution-processable infrared photodetectors: Materials, device physics, and applications

Recent Progress of Quantum Dot‐Based Photonic Devices and Systems: A Comprehensive Review of Materials, Devices, and Applications

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