Dye-sensitized 1D anatase TiO2 nanorods for tunable efficient photodetection in the visible range

Parreira, P. , Torres, E., Nunes, C., Nunes de Carvalho, C., Lavareda, G., Amaral, A. and Brites, M.J. (2012) Dye-sensitized 1D anatase TiO2 nanorods for tunable efficient photodetection in the visible range. Sensors and Actuators B: Chemical, 161(1), pp. 901-907. (doi:10.1016/j.snb.2011.11.059)

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Abstract

TiO2 films with enhanced photosensitivity were deposited on alkali free glass substrates without intentional substrate heating by pulsed DC magnetron reactive sputtering with an average thickness of about 2 μm. Three dyes, commercial N719 and two new organic dyes were impregnated in order to control the optical spectral selectivity of such films. The type of dye used proved to dramatically influence the device's response to radiation pulses. The practical breakthrough is the use of different dyes according to the region of the electromagnetic spectrum one wants to detect. Devices with photocurrent 6 orders of magnitude higher than the dark current (from ∼2 × 10−12 to 2 × 10−6 A for a 100 V bias) were fabricated with a spectral response within the visible range of the electromagnetic spectrum. In addition, this approach is likely to allow for the fabrication of hybrid photodetectors on cheap heat sensible flexible polymeric substrates.

Item Type:Articles
Additional Information:This work was supported by Fundac¸ ão para a Ciência e Tecnologia through the research projects PTDC/ENR/64909/2006 and PTDC/EEA-ELC/74334/2006.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Parreira, Dr Pedro Miguel
Authors: Parreira, P., Torres, E., Nunes, C., Nunes de Carvalho, C., Lavareda, G., Amaral, A., and Brites, M.J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Sensors and Actuators B: Chemical
Publisher:Elsevier
ISSN:0925-4005
Published Online:07 December 2011

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