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

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.

[1]  J. Nelson,et al.  Photoconductivity and charge trapping in porous nanocrystalline titanium dioxide , 2002 .

[2]  Akihiro Furube,et al.  Oligothiophene-containing coumarin dyes for efficient dye-sensitized solar cells. , 2005, The journal of physical chemistry. B.

[3]  Max Shtein,et al.  Organic photodetector with spectral response tunable across the visible spectrum by means of internal optical microcavity , 2009 .

[4]  N. Marzari,et al.  Ultraviolet Photodetectors Based on Anodic TiO2 Nanotube Arrays , 2010 .

[5]  R. P. Gupta,et al.  Oxide Materials for Development of Integrated Gas Sensors—A Comprehensive Review , 2004 .

[6]  Hailin Xue,et al.  TiO2 based metal-semiconductor-metal ultraviolet photodetectors , 2007 .

[7]  B. Parkinson,et al.  Dye Sensitization of Natural Anatase Crystals with a Ruthenium-Based Dye , 2002 .

[8]  W. J. Beek,et al.  Hybrid Polymer-Inorganic Photovoltaic Cells , 2009 .

[9]  B. Parkinson,et al.  The Adsorption Behavior of a Ruthenium‐Based Sensitizing Dye to Nanocrystalline TiO2 Coverage Effects on the External and Internal Sensitization Quantum Yields , 1999 .

[10]  D. Kaur,et al.  Room temperature growth of nanocrystalline anatase TiO2 thin films by dc magnetron sputtering , 2010 .

[11]  S. Ahn,et al.  Origin of the slow photoresponse in an individual sol-gel synthesized ZnO nanowire , 2007 .

[12]  H. Pettersson,et al.  Dye-sensitized solar cells. , 2010, Chemical Reviews.

[13]  Hironori Arakawa,et al.  Effect of additives on the photovoltaic performance of coumarin-dye-sensitized nanocrystalline TiO2 solar cells. , 2004, Langmuir : the ACS journal of surfaces and colloids.

[14]  Anders Hagfeldt,et al.  Influence of triple bonds as π-spacer units in metal-free organic dyes for dye-sensitized solar cells , 2010 .

[15]  Ho Won Jang,et al.  Highly sensitive CO sensors based on cross-linked TiO2 hollow hemispheres , 2010 .

[16]  Michael Grätzel,et al.  Effect of a coadsorbent on the performance of dye-sensitized TiO2 solar cells: shielding versus band-edge movement. , 2005, The journal of physical chemistry. B.

[17]  Stephen R. Forrest,et al.  Small molecular weight organic thin-film photodetectors and solar cells , 2003 .

[18]  A. Fujishima,et al.  TiO2 Photocatalysis: A Historical Overview and Future Prospects , 2005 .

[19]  F. Lévy,et al.  TiO2 anatase thin films as gas sensors , 1995 .

[20]  Yan Cui,et al.  Thiophene-Functionalized Coumarin Dye for Efficient Dye-Sensitized Solar Cells: Electron Lifetime Improved by Coadsorption of Deoxycholic Acid , 2007 .