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Structural and Photoconductivity Properties of Tellurium/PMMA Films.

Carotenuto G, Palomba M, De Nicola S, Ambrosone G, Coscia U - Nanoscale Res Lett (2015)

Bottom Line: A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer.The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide.Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

View Article: PubMed Central - PubMed

Affiliation: Institute for Polymers, Composites and Biomaterials, National Research Council, Piazzale E. Fermi 1, 80055, Portici, Naples, Italy.

ABSTRACT
Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4.8 ± 0.8 nm were produced by dry vibration milling technique using a mixer/mill apparatus. A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer. The morphology, elemental composition, and structural and optical properties of Te/PMMA films were investigated. The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide. The electrical properties of the films were studied, for different electrode contact configurations, in dark condition and under white light illumination varying the optical power density from 2 to 170 mW/cm(2) and turning the light on and off cyclically. Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

No MeSH data available.


Time-dependent photocurrent, Iph, measurements for different light-dark cycles at various light power densities (100, 120, and 170 mW/cm2) for coplanar configuration. In the inset, the maximum photocurrent obtained for each cycle, Iphmax, versus light power density, F, is displayed
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Fig8: Time-dependent photocurrent, Iph, measurements for different light-dark cycles at various light power densities (100, 120, and 170 mW/cm2) for coplanar configuration. In the inset, the maximum photocurrent obtained for each cycle, Iphmax, versus light power density, F, is displayed

Mentions: In order to investigate the photoconductivity properties, the samples were illuminated by white light of different power density values. The current under illumination, Ilight, was measured in coplanar configuration, by applying a bias voltage of 200 V to reach a good signal-to-noise ratio avoiding high power dissipation. The illumination exposure time was held fixed at 440 s and immediately after the light was switched off to obtain light-dark cycles and evaluate the photocurrent, Iph, as Iph = Ilight − Idark, where Idark was the dark current measured before turning on the light. The evolution of Iph as a function of time for light-dark cycles performed by light power densities of 100, 120, and 170 mW/cm2 is shown in Fig. 8. The photocurrent signal slowly increases under illumination, and the rise time varies in the 100–300 s range. Upon turning off the light, the signal decreases slowly and the decay time varies in the same range. The inset in Fig. 8 shows the maximum value of the photocurrent for each cycle, Iphmax, as a function of power density F in the 10–170 mW/cm2 range.Fig. 8


Structural and Photoconductivity Properties of Tellurium/PMMA Films.

Carotenuto G, Palomba M, De Nicola S, Ambrosone G, Coscia U - Nanoscale Res Lett (2015)

Time-dependent photocurrent, Iph, measurements for different light-dark cycles at various light power densities (100, 120, and 170 mW/cm2) for coplanar configuration. In the inset, the maximum photocurrent obtained for each cycle, Iphmax, versus light power density, F, is displayed
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526513&req=5

Fig8: Time-dependent photocurrent, Iph, measurements for different light-dark cycles at various light power densities (100, 120, and 170 mW/cm2) for coplanar configuration. In the inset, the maximum photocurrent obtained for each cycle, Iphmax, versus light power density, F, is displayed
Mentions: In order to investigate the photoconductivity properties, the samples were illuminated by white light of different power density values. The current under illumination, Ilight, was measured in coplanar configuration, by applying a bias voltage of 200 V to reach a good signal-to-noise ratio avoiding high power dissipation. The illumination exposure time was held fixed at 440 s and immediately after the light was switched off to obtain light-dark cycles and evaluate the photocurrent, Iph, as Iph = Ilight − Idark, where Idark was the dark current measured before turning on the light. The evolution of Iph as a function of time for light-dark cycles performed by light power densities of 100, 120, and 170 mW/cm2 is shown in Fig. 8. The photocurrent signal slowly increases under illumination, and the rise time varies in the 100–300 s range. Upon turning off the light, the signal decreases slowly and the decay time varies in the same range. The inset in Fig. 8 shows the maximum value of the photocurrent for each cycle, Iphmax, as a function of power density F in the 10–170 mW/cm2 range.Fig. 8

Bottom Line: A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer.The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide.Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

View Article: PubMed Central - PubMed

Affiliation: Institute for Polymers, Composites and Biomaterials, National Research Council, Piazzale E. Fermi 1, 80055, Portici, Naples, Italy.

ABSTRACT
Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4.8 ± 0.8 nm were produced by dry vibration milling technique using a mixer/mill apparatus. A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer. The morphology, elemental composition, and structural and optical properties of Te/PMMA films were investigated. The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide. The electrical properties of the films were studied, for different electrode contact configurations, in dark condition and under white light illumination varying the optical power density from 2 to 170 mW/cm(2) and turning the light on and off cyclically. Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

No MeSH data available.