Multifunctional zinc oxide thin films for high-performance UV photodetectors and nitrogen dioxide gas sensors

Shaikh, Shahin; Ganbavle, V.V.; Inamdar, S.I.; Rajpure, K.Y.

doi:10.1039/c6ra01750a

Cited by 90 publications

(34 citation statements)

References 44 publications

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“…The average responsivity decreases from 1.5 ± 1.2 to 1.4 ± 1.0 and 1.0 ± 0.85 mA W −1 for UV power densities of 0.2, 0.5, and 2.3 mW cm −2 , respectively. Such behavior has previously been observed in other UV photodetectors based on ZnO NWs . Although the photocurrent density increases with the UV power density, this relation is not linear.…”

Section: Resultssupporting

confidence: 71%

“…When n is higher than 1, the photocurrent density saturates with the increase in the UV power density, resulting in the overall decrease of responsivity

(R \propto P_{normali}^{n - 1}

). This saturation phenomenon has previously been observed for ZnO‐based photodetectors, being attributed to complex electron–hole pair generation, trapping of the holes and recombination processes . By applying a negative −1 V bias, the average responsivity is increased by approximately two orders of magnitude and reaches a maximum of 468 mA W −1 for a UV power density of 0.2 mW cm −2 .…”

Section: Resultssupporting

confidence: 53%

“…Although the photocurrent density increases with the UV power density, this relation is not linear. The dependence can be represented as a power function:

J_{ph} \propto P_{normali}^{n}

, where n is an exponent defining the response of the photocurrent density to power density ( P i ) . When n is higher than 1, the photocurrent density saturates with the increase in the UV power density, resulting in the overall decrease of responsivity

(R \propto P_{normali}^{n - 1}

).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

ZnO/CuCrO₂ Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response

Cossuet

Resende

Rapenne

et al. 2018

Adv Funct Materials

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An original self-powered UV photodetector integrating ZnO/CuCrO 2 core-shell nanowire heterostructures is fabricated using low-cost and scalable chemical deposition techniques operating at moderate temperatures. A 35 nm thick delafossite phase CuCrO 2 shell is formed with high uniformity by aerosol-assisted chemical vapor deposition over an array of vertically aligned ZnO nanowires grown by chemical bath deposition. The CuCrO 2 shell consists of columnar grains at the top of ZnO nanowires as well as nanograins with some preferential orientations on their vertical sidewalls. The ZnO/CuCrO 2 core-shell nanowire heterostructures exhibit significant diode behavior, with a rectification ratio approaching 1.2 × 10 4 at 1 V and -1 V, as well as a high optical absorptance above 85% in the UV part of the electromagnetic spectrum. A high UV responsivity at zero bias under low-power illumination of up to 3.43 mA W -1 under a 365 nm UV lamp, and up to 5.87 mA W -1 at 395 nm from spectrally resolved measurements, alongside a high selectivity with a UV-to-visible (395-550 nm) rejection ratio of 106 is measured. The short rise and decay times of 32 and 35 µs, respectively, both measured at zero bias, further establish these devices as promising candidates for cost-efficient, all-oxide self-powered UV photodetectors.

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Section: Resultssupporting

confidence: 71%

“…When n is higher than 1, the photocurrent density saturates with the increase in the UV power density, resulting in the overall decrease of responsivity

(R \propto P_{normali}^{n - 1}

Section: Resultssupporting

confidence: 53%

“…Although the photocurrent density increases with the UV power density, this relation is not linear. The dependence can be represented as a power function:

J_{ph} \propto P_{normali}^{n}

(R \propto P_{normali}^{n - 1}

).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

ZnO/CuCrO₂ Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response

Cossuet

Resende

Rapenne

et al. 2018

Adv Funct Materials

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show abstract

“…Ultraviolet (UV) light and toxic/poisonous gases are common environmental pollution sources, which are harmful threats to health of human beings [1,2]. Excessive exposure to UV light can cause a series of damages to human body functions, especially to body skin, eyes and immune system, and result in skin cancer.…”

Section: Introductionmentioning

confidence: 99%

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

Yan

Zhang

et al. 2019

Journal of Alloys and Compounds

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2019) Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature. Journal of Alloys and Compounds, 770. pp. 721-731. AbstractA dual functional sensor for detecting both UV light and H2S gas was fabricated using the hexagonal phase porous In2O3 nanoparticles, which were prepared using the hydrothermal and calcination process. The porous In2O3 nanoparticles with large surface areas and pore volumes could provide plenty of active sites to produce much active oxygen species, which were beneficial for the UV light and H2S gas sensing reactions, thus resulting in a good sensing performance. At room temperature, the dual functional sensor based on porous In2O3 nanoparticles exhibited ultra-high responses for sensing both UV light (with a wavelength of 365 nm) and H2S gas. As a UV sensor, its response was 12886.0 for a UV power intensity of 1.287 mW/cm 2 and its detection limit was 0.013 mW/cm 2 . As a H2S gas sensor, the sensor exhibited an ultra-high response (26268.5 to 1 ppm H2S) and a very low detection limit (1ppb of H2S), and it also have excellent selectivity, reversibility and stability. 2

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“…ZnO is an established candidate for UV detectors because it has a wide band gap of 3.37 eV [11] [12], which corresponds to the UV spectrum. The ZnO active layer conductivity is extremely sensitive to UV radiation exposure, which is related with its photosensitivity regulated by chemisorption of oxygen [13]- [15]. Oxygen molecules can be adsorbed on the surface of ZnO films, resulting in negatively charged oxygen ions that create an electron depletion layer, in which the ZnO layer becomes less conductive near the surface [16].…”

Section: Introductionmentioning

confidence: 99%

UV Phototransistors-Based Upon Spray Coated and Sputter Deposited ZnO TFTs

et al. 2020

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A comparison of Zinc Oxide (ZnO) phototransistors prepared by spray and sputter coating process is presented. The work shows that spray coated layers provide significant advantages in sensor response over ZnO phototransistors made by physical vapour deposition and we show that spray deposited ZnO phototransistors can exhibit state-of-the-art performances for UV photodetectors. Topographic images of the samples surface shows that there is increase in surface roughness in spray coated samples indicating increasing grain sizes, which is considered the source of the greater sensor responsivity. X-ray photoelectron spectroscopy (XPS) is also used to understand the root cause of the greater UV responsivity. It was observed that sprayed ZnO TFTs are more sensitive to UV radiation due to higher adsorption of oxygen level. Responsivity and external quantum efficiency (EQE) of the sprayed and sputtered ZnO TFTs are also evaluated.

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Multifunctional zinc oxide thin films for high-performance UV photodetectors and nitrogen dioxide gas sensors

Abstract: Multifunctional use of ZnO thin film as NO2 gas sensor and UV photodetector.

Cited by 90 publications

References 44 publications

ZnO/CuCrO₂ Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response

ZnO/CuCrO₂ Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

UV Phototransistors-Based Upon Spray Coated and Sputter Deposited ZnO TFTs

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Multifunctional zinc oxide thin films for high-performance UV photodetectors and nitrogen dioxide gas sensors

Abstract: Multifunctional use of ZnO thin film as NO2 gas sensor and UV photodetector.

Cited by 90 publications

References 44 publications

ZnO/CuCrO2 Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response

ZnO/CuCrO2 Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

UV Phototransistors-Based Upon Spray Coated and Sputter Deposited ZnO TFTs

Contact Info

Product

Resources

About

ZnO/CuCrO₂ Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response

ZnO/CuCrO₂ Core–Shell Nanowire Heterostructures for Self‐Powered UV Photodetectors with Fast Response