Thin film diamond UV photodetectors: photodiodes compared with photoconductive devices for highly selective wavelength response

Whitfield, Michael D.; McKeag, Robert D.; Pang, Lisa Y.S.; Chan, Simon; Jackman, Richard B.

doi:10.1016/0925-9635(95)00419-x

Cited by 39 publications

(2 citation statements)

References 9 publications

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“…Semiconductor-based chemiresistive sensors are amongst the most investigated and widely used devices for the detection of combustible and toxic gases owing to their low cost, miniaturization potential and circuit simplicity [32,33]. Such chemiresistive gas sensors are able to detect a wide variety of reactive reducing or oxidizing gases at very low ppb concentrations via a strong variation of their resistivity, which are not detectable with catalytic combustion and electrochemical-based gas sensors [34,35].…”

Section: Chemiresistive Sensorsmentioning

confidence: 99%

Advances in Wearable Sensing Technologies and Their Impact for Personalized and Preventive Medicine

Nasiri

Tricoli

2018

Wearable Technologies

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Recent advances in miniaturized electronics, as well as mobile access to computational power, are fostering a rapid growth of wearable technologies. In particular, the application of such wearable technologies to health care enables to access more information from the patient than standard episodically testing conducted in health provider centres. Clinical, behavioural and self-monitored data collected by wearable devices provide a means for improving the early-stage detection and management of diseases as well as reducing the overall costs over more invasive standard diagnostics approaches. In this chapter, we will discuss some of the ongoing key innovations in materials science and micro/nanofabrication technologies that are setting the basis for future personalized and preventive medicine devices and approaches. The design of wire-and powerless ultra-thin sensors fabricated on wearable biocompatible materials that can be placed in direct contact with the body tissues such as the skin will be reviewed, focusing on emerging solutions and bottlenecks. The application of nanotechnology for the fabrication of sophisticated miniaturized sensors will be presented. Exemplary sensor designs for the non-invasive measurement of ultra-low concentrations of important biomarkers will be discussed as case studies for the application of these emerging technologies.

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Section: Chemiresistive Sensorsmentioning

confidence: 99%

Advances in Wearable Sensing Technologies and Their Impact for Personalized and Preventive Medicine

Nasiri

Tricoli

2018

Wearable Technologies

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“…Quantum dots (QDs), nanotubes, nanowires, nanorods, nanobelts,[22a,27] core/shell structures, nanostructure arrays,[19a,29] epitaxial film, and heterostructures are regarded as the future building blocks of visible‐blind UV photodetectors. Compared to traditional thin‐film and bulk materials, low‐dimensional nanostructured UV photodetectors are usually characterized by higher responsivity and photoconductivity gain,[1c,31] due to their high surface‐area‐to‐volume ratios and the nanoscale confined carrier transport kinetics. [3c,9,25b,32] The large surface‐to‐volume ratio significantly increases the number of surface trap states that can prolong the photocarrier lifetime by delaying the electron‐hole recombination process.…”

Section: Introductionmentioning

confidence: 99%

Nanoarchitechtonics of Visible‐Blind Ultraviolet Photodetector Materials: Critical Features and Nano‐Microfabrication

Nasiri

Jin

Tricoli

2018

Advanced Optical Materials

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Low-dimensional materials are usually classified into 0D, [19b,20] 1D, [2b,21] and 2D. [22] Quantum dots (QDs), [23] nanotubes, [24] nanowires, [25] nanorods, [18,26] nanobelts, [22a,27] core/ shell structures, [28] nanostructure arrays, [19a,29] epitaxial film, and heterostructures [30] are regarded as the future building blocks of visible-blind UV photodetectors. Compared to traditional thinfilm and bulk materials, low-dimensional nanostructured UV photodetectors are usually characterized by higher responsivity and photoconductivity gain, [1c,31] due to their high surface-areato-volume ratios and the nanoscale confined carrier transport kinetics. [3c,9,25b,32] The large surface-to-volume ratio significantly increases the number of surface trap states that can prolong the photocarrier lifetime by delaying the electron-hole recombination process. [1b,3c,9] In fact, the photoexcited carriers can be trapped by surface trap states and in that case their decay dynamics is dominated by the escape time from the traps. [33] The reduced dimensionality can confine the charge carrier transport path shortening the transit time and reducing recombination events. [3c] Nanostructured wide bandgap UV photodetectors have been produced by several methods, such as magnetron sputtering, [34] pulsed laser deposition, [35] chemical vapor deposition, [36] flame spray pyrolysis, [2d,9,15] and sol-gel. [37] A critical aspect remains how to accurately control the composition and hierarchical arrangement from the atomic scale of surface and bulk defects to the microscale of the active device area. The latter has been shown to be a dominant feature resulting in significant variation in the UV light response of quasi-identical nanomaterials. [9,25b,38] For instance, ZnO nanowires are usually reported to achieve orders of magnitude higher responsivity and detectivity than nanothin ZnO films. Similarly, ultraporous nanoparticle networks have shown thousand folds higher photo to dark-current ratios than more densely arranged ZnO nanoparticle layers resulting in among the highest detectivity reported for such 0D materials. [3c,9,39] Here, we present a comprehensive review of the latest achievements and research directions on the multiscale engineering of wide bandgap semiconductor materials for photodetection of UV light. We will focus on the impact of the nano-to microscale material hierarchy discussing commonalities and discrepancies across materials and morphologies. We will conclude with a review of the rapidly emerging trends and promising strategies for overcoming remaining issues for the engineering of the next generation of miniaturized wide bandgap semiconductors UV photodetectors for wearable and easily deployable devices. Photodetection MechanismWide bandgap semiconductors have been investigated in many recent studies to understand the fundamental process and enhancing the response to the UV light. [9,15,25b,40] The photoresponse characteristics of nanostructured devices are significantly influenced by a number of...

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Diamond Electronics: Defect Passivation for High Performance Photodetector Operation

Whitfield

Lansley

Gaudin

et al. 2000

phys. stat. sol. (a)

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Deep UV, visible blind, photoconductive devices fabricated on polycrystalline CVD diamond using inter-digitated planar electrodes have shown promising characteristics. The`as-fabricated' device performance is insufficient for many applications; a particularly demanding example is the monitoring of high power excimer lasers operating in the UV, which ideally require visible-blind, radiation hard fast UV detectors. However, post-growth treatments can strongly modify the performance level achieved. In this paper, we show that sequentially applied treatments can progressively change both the gain and speed of these devices. We have used charge sensitive deep level transient spectroscopy (Q-DLTS) to study the effect of these treatments on the defect structure of CVD material. For the first time, we report the realisation of diamond photoconductive devices capable of operating at more than 1 MHz at 193 nm.

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Thin film diamond UV photodetectors: photodiodes compared with photoconductive devices for highly selective wavelength response

Cited by 39 publications

References 9 publications

Advances in Wearable Sensing Technologies and Their Impact for Personalized and Preventive Medicine

Advances in Wearable Sensing Technologies and Their Impact for Personalized and Preventive Medicine

Nanoarchitechtonics of Visible‐Blind Ultraviolet Photodetector Materials: Critical Features and Nano‐Microfabrication

Diamond Electronics: Defect Passivation for High Performance Photodetector Operation

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