Influence of the porosity on diffusion and lifetime in porous TiO2 layers | Zendy

Th. Dittrich | Zendy; Ashi Ofir | Zendy; Shay Tirosh | Zendy; Larissa Grinis | Zendy; Arie Zaban | Zendy

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Influence of the porosity on diffusion and lifetime in porous TiO2 layers

Author(s) -

Th. Dittrich,

Ashi Ofir,

Shay Tirosh,

Larissa Grinis,

Arie Zaban

Publication year - 2006

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2201045

Subject(s) - porosity , materials science , diffusion , sintering , electrolyte , porous medium , photocurrent , nanoparticle , chemical engineering , composite material , nanotechnology , chemistry , thermodynamics , electrode , optoelectronics , physics , engineering

Photocurrent transients were investigated on pressed and sintered porous TiO2 layers which were immersed in electrolyte during the measurements. Unpressed porous TiO2 layers were prepared by electrophoretic deposition. The porosity of the layers was changed systematically by pressing. The surfaces of the TiO2 nanoparticles and the intimate contact between them were identically conditioned by sintering in air at 450°C after pressing. With decreasing porosity, the diffusion coefficient increased while the electron lifetime decreased. The results are discussed on the base of the change of the mean coordination number between TiO2 nanoparticles.

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