Balance of photon management and charge collection from carbon-quantum-dot layers as self-powered broadband photodetectors

Hsiao, Po-Hsuan; Kuo, Kuan-Yi; Chen, Yafeng; Wu, Tsung‐Yen; Chen, Chia‐Yun

doi:10.1039/d2na00852a

Cited by 11 publications

(7 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OPDs are generally operated under reverse bias voltage, which improves the charge extraction behavior of the devices. 48,49 Response speed defines the charge transfer capability of the photoelectric detecting element under transient light, which is represented by rise time and fall time, respectively. 10 The rise time is affected by the charge collection ability, and the fall time is affected by the charge output.…”

Section: Resultsmentioning

confidence: 99%

“…Subsequently, we study the response speed of the OPD with ZnO and hybrid ETLs to the light signal and investigate its transient response time. OPDs are generally operated under reverse bias voltage, which improves the charge extraction behavior of the devices. , Response speed defines the charge transfer capability of the photoelectric detecting element under transient light, which is represented by rise time and fall time, respectively . The rise time is affected by the charge collection ability, and the fall time is affected by the charge output. , Figure b and c shows the rise and fall times, respectively, of the OPDs with ZnO and hybrid ETLs.…”

Section: Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Advancing Detectivity and Stability of Near-Infrared Organic Photodetectors via a Facile and Efficient Cathode Interlayer

Huang,

Wang,

Huang

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Near-infrared (NIR) organic photodetectors (OPDs) are pivotal in numerous technological applications due to their excellent responsivity within the NIR region. Polyethylenimine ethoxylated (PEIE) has conventionally been employed as an electron transport layer (hole-blocking layer) to suppress dark current (J D) and enhance charge transport. However, the limitations of PEIE in chemical stability, processing conditions, environmental impact, and absorption range have spurred the development of alternative materials. In this study, we introduced a novel solution: a hybrid of sol–gel zinc oxide (ZnO) and N,N′-bis(N,N-dimethylpropan-1-amine oxide)perylene-3,4,9,10-tetracarboxylic diimide (PDINO) as the electron transport layer for NIR-OPDs. Our fabricated OPD exhibited significantly improved responsivity, reduced internal traps, and enhanced charge transfer efficiency. The detectivity, spanning from 400 to 1100 nm, surpassed ∼5 × 1012 Jones, reaching ∼1.1 × 1012 Jones at 1000 nm, accompanied by an increased responsivity of 0.47 A/W. Also, the unpackaged OPD remarkedly demonstrated stable J D and external quantum efficiency (EQE) over 1000 h under dark storage conditions. This innovative approach not only addresses the drawbacks of conventional PEIE-based OPDs but also offers promising avenues for the development of high-performance OPDs in the future.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Advancing Detectivity and Stability of Near-Infrared Organic Photodetectors via a Facile and Efficient Cathode Interlayer

Huang,

Wang,

Huang

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…3(a); these results correspond with literature. [31][32][33] It should be noted that neither bare AuNPs nor the CQDs could display colorimetric changes for tracing Cu 2+ ions, while present spectra remained unchanged under the involvement of tested Cu 2+ ions with various concentrations from 0, 10, to 20 mm, respectively. Interestingly, dramatic variations in spectral patterns could be observed in CQD/AuNP probes in the presence of different concentrations of Cu 2+ ion analytes, as illustrated in Fig.…”

Section: Detection Resultsmentioning

confidence: 99%

Sensitivity improvement of Au-nanoparticle-based colorimetric probes via surface decoration of carbon quantum dots

Li,

Lo,

Lin

et al. 2024

New J. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Considering the high absorption coefficient and short L D of CISe QD layers, we determined the optimum thickness of light absorption layers to be ∼40 nm for CISe QD-PDs for the efficient extraction and collection of photogenerated carriers (Figure S14b). 70,71 This thin thickness is also advantageous for the fabrication of highly flexible devices. decrease with a further increase in light intensity owing to the gradual saturation of photogenerated carriers and enhanced carrier recombination at relatively high light intensities.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultrathin Self-Powered Heavy-Metal-Free Cu–In–Se Quantum Dot Photodetectors for Wearable Health Monitoring

Li,

Jang,

Chung

et al. 2023

ACS Nano

View full text Add to dashboard Cite

Mechanically deformable photodetectors (PDs) are key device components for wearable health monitoring systems based on photoplethysmography (PPG). Achieving high detectivity, fast response time, and an ultrathin form factor in the PD is highly needed for next-generation wearable PPG systems. Self-powered operation without a bulky power-supply unit is also beneficial for point-of-care application. Here, we propose ultrathin self-powered PDs using heavy-metal-free Cu–In–Se quantum dots (QDs), which enable high-performance wearable PPG systems. Although the light-absorbing QD layer is extremely thin (∼40 nm), the developed PD exhibits excellent performance (specific detectivity: 2.10 × 1012 Jones, linear dynamic range: 102 dB, and spectral range: 250–1050 nm at zero bias), which is comparable to that of conventional rigid QD-PDs employing thick Pb-chalcogenide QD layers. This is attributed to material and device strategiesmaterials that include Cu–In–Se QDs, a MoS2-nanosheet-blended poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) hole transport layer, a ZnO nanoparticle electron transport layer, Ag and ITO electrodes, and an ultrathin form factor (∼120 nm except the electrodes) that enable excellent mechanical deformability. These allow the successful application of QD-PDs to a wearable system for real-time PPG monitoring, expanding their potential in the field of mobile bioelectronics.

show abstract

Balance of photon management and charge collection from carbon-quantum-dot layers as self-powered broadband photodetectors

Abstract: Semiconductor colloidal quantum dots (QDs) have been regarded as promising fluorescent materials for chemical sensing, bio-detection and optical communications; yet they still remained challenging to come out self-powered photodetectors solely...

Cited by 11 publications

References 43 publications

Advancing Detectivity and Stability of Near-Infrared Organic Photodetectors via a Facile and Efficient Cathode Interlayer

Advancing Detectivity and Stability of Near-Infrared Organic Photodetectors via a Facile and Efficient Cathode Interlayer

Sensitivity improvement of Au-nanoparticle-based colorimetric probes via surface decoration of carbon quantum dots

Ultrathin Self-Powered Heavy-Metal-Free Cu–In–Se Quantum Dot Photodetectors for Wearable Health Monitoring

Contact Info

Product

Resources

About