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Multicolor Photodetector of a Single Er(3+)-Doped CdS Nanoribbon.

Dedong H, Ying-Kai L, Yu DP - Nanoscale Res Lett (2015)

Bottom Line: It is found that Er-CdS NR has the ability of detecting multicolor light including blue, red, and near-infrared light with higher responsivity (R λ ) and external quantum efficiency (η).These results indicated that ionized impurities and the intrinsic excitation are responsible for the conductance change of Er-CdS NR in the dark.The superior performance of the Er-CdS NR device offers an avenue to develop highly sensitive multicolor photodetector applications.

View Article: PubMed Central - PubMed

Affiliation: Institute of Physics and Electronic Information, Yunnan Normal University, No. 768 Juxian Street, Chenggong New District, Kunming, 650500, People's Republic of China, ddhou@126.com.

ABSTRACT
Er(3+)-doped CdS nanoribbons (Er-CdS NRs) are synthesized by thermal evaporation and then characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL), and absorption spectra. The Er-CdS NR photodetector is studied systematically, including spectral response, light intensity response, and photoconductance (G) versus temperature (T). It is found that Er-CdS NR has the ability of detecting multicolor light including blue, red, and near-infrared light with higher responsivity (R λ ) and external quantum efficiency (η). The conductance of Er-CdS NR under dark conditions decreases with increasing temperature in the range of 87-237 K, while its conductance increases with increasing temperature in the range of 237-297 K when T is larger than 237 K. These results indicated that ionized impurities and the intrinsic excitation are responsible for the conductance change of Er-CdS NR in the dark. The superior performance of the Er-CdS NR device offers an avenue to develop highly sensitive multicolor photodetector applications.

No MeSH data available.


Related in: MedlinePlus

The detector’s photoresponse properties. a A schematic diagram of the detector configuration. bI-V curves of the Er-CdS NR device under illumination with an incandescent lamp; the inset shows the optical microscopic image of a single Er-CdS NR detector. c The spectra response and absorption spectra of the Er-CdS NR detector; the inset shows the absorption spectrum of the Er-CdS NR detector in the range of 600–1200 nm. d PL spectra of Er-CdS NRs
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Fig3: The detector’s photoresponse properties. a A schematic diagram of the detector configuration. bI-V curves of the Er-CdS NR device under illumination with an incandescent lamp; the inset shows the optical microscopic image of a single Er-CdS NR detector. c The spectra response and absorption spectra of the Er-CdS NR detector; the inset shows the absorption spectrum of the Er-CdS NR detector in the range of 600–1200 nm. d PL spectra of Er-CdS NRs

Mentions: Figure 3a is a schematic diagram of the device configuration for photocurrent measurement, in which a monochromatic light (full width at half maximum (FWHM) 3 nm) is illuminated on the surface of the Er-CdS NR in the normal direction, and the I-V measurements are performed by using a two-probe method. In our experiments, Ti/Au parallel electrodes 10 μm apart are deposited on the nanoribbon dispersed on a p-type Si substrate with a 500-nm-thick SiO2 layer, and the uncovered part of the nanoribbon is exposed to the incident light. The inset of Fig. 3b displays the optical image of a fabricated Er-CdS NR detector with a width of 20.8 μm and a thickness of less than 70 nm. Its typical I-V curves under dark conditions and incandescent light illumination with a power density of 1.5 mW/cm2 are shown in Fig. 3b. It is seen that the photocurrent drastically increases under incandescent light illumination compared to the dark current. The approximate linear shape of the I-V curves suggests good ohmic contacts between the Er-CdS NR and Ti/Au electrodes. The PC ratio of the Er-CdS NR illuminated by incandescent light to that under dark conditions is 5500.Fig. 3


Multicolor Photodetector of a Single Er(3+)-Doped CdS Nanoribbon.

Dedong H, Ying-Kai L, Yu DP - Nanoscale Res Lett (2015)

The detector’s photoresponse properties. a A schematic diagram of the detector configuration. bI-V curves of the Er-CdS NR device under illumination with an incandescent lamp; the inset shows the optical microscopic image of a single Er-CdS NR detector. c The spectra response and absorption spectra of the Er-CdS NR detector; the inset shows the absorption spectrum of the Er-CdS NR detector in the range of 600–1200 nm. d PL spectra of Er-CdS NRs
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4495098&req=5

Fig3: The detector’s photoresponse properties. a A schematic diagram of the detector configuration. bI-V curves of the Er-CdS NR device under illumination with an incandescent lamp; the inset shows the optical microscopic image of a single Er-CdS NR detector. c The spectra response and absorption spectra of the Er-CdS NR detector; the inset shows the absorption spectrum of the Er-CdS NR detector in the range of 600–1200 nm. d PL spectra of Er-CdS NRs
Mentions: Figure 3a is a schematic diagram of the device configuration for photocurrent measurement, in which a monochromatic light (full width at half maximum (FWHM) 3 nm) is illuminated on the surface of the Er-CdS NR in the normal direction, and the I-V measurements are performed by using a two-probe method. In our experiments, Ti/Au parallel electrodes 10 μm apart are deposited on the nanoribbon dispersed on a p-type Si substrate with a 500-nm-thick SiO2 layer, and the uncovered part of the nanoribbon is exposed to the incident light. The inset of Fig. 3b displays the optical image of a fabricated Er-CdS NR detector with a width of 20.8 μm and a thickness of less than 70 nm. Its typical I-V curves under dark conditions and incandescent light illumination with a power density of 1.5 mW/cm2 are shown in Fig. 3b. It is seen that the photocurrent drastically increases under incandescent light illumination compared to the dark current. The approximate linear shape of the I-V curves suggests good ohmic contacts between the Er-CdS NR and Ti/Au electrodes. The PC ratio of the Er-CdS NR illuminated by incandescent light to that under dark conditions is 5500.Fig. 3

Bottom Line: It is found that Er-CdS NR has the ability of detecting multicolor light including blue, red, and near-infrared light with higher responsivity (R λ ) and external quantum efficiency (η).These results indicated that ionized impurities and the intrinsic excitation are responsible for the conductance change of Er-CdS NR in the dark.The superior performance of the Er-CdS NR device offers an avenue to develop highly sensitive multicolor photodetector applications.

View Article: PubMed Central - PubMed

Affiliation: Institute of Physics and Electronic Information, Yunnan Normal University, No. 768 Juxian Street, Chenggong New District, Kunming, 650500, People's Republic of China, ddhou@126.com.

ABSTRACT
Er(3+)-doped CdS nanoribbons (Er-CdS NRs) are synthesized by thermal evaporation and then characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL), and absorption spectra. The Er-CdS NR photodetector is studied systematically, including spectral response, light intensity response, and photoconductance (G) versus temperature (T). It is found that Er-CdS NR has the ability of detecting multicolor light including blue, red, and near-infrared light with higher responsivity (R λ ) and external quantum efficiency (η). The conductance of Er-CdS NR under dark conditions decreases with increasing temperature in the range of 87-237 K, while its conductance increases with increasing temperature in the range of 237-297 K when T is larger than 237 K. These results indicated that ionized impurities and the intrinsic excitation are responsible for the conductance change of Er-CdS NR in the dark. The superior performance of the Er-CdS NR device offers an avenue to develop highly sensitive multicolor photodetector applications.

No MeSH data available.


Related in: MedlinePlus