Thermoelectric Power-Factor of Ag-Doped TiO2 Thin Film

Author:

Usop RohaidaORCID,Hasnan Megat Muhammad Ikhsan MegatORCID,Mohamad Mahazani,Ahmad Mohd Khairul,Said Suhana Mohd,Salleh Faiz

Abstract

The thermoelectric power-factor of two types of rutile-phased nanostructured-TiO2 thin films doped with Ag was investigated at room temperature, by measuring their Seebeck coefficient and electrical conductivity. The thin films, consisting of a nanorod structure (single layer) and nanorod and nanoflower structure (bilayer) of TiO2, with the addition of different wt.% of AgNO3 were synthesized on an F:SnO2-coated glass substrate. The evaluated thermoelectric power-factor was observed to increase with an increasing wt.% of AgNO3 for both structures, with the bilayer structure increasing three times more than the undoped bilayer-structure, with a value of 148 μWm–1K–2 at 0.15 wt.%. This enhancement was due to the increase in electrical conductivity, which compensated for the small changes in the Seebeck coefficient, which were likely due to the increase in carrier concentration. Consequently, an enhancement in the thermoelectric conversion-efficiency of TiO2 thin film may be observed by Ag doping, without influencing the layer structure and material phase.

Funder

Ministry of Higher Education

Universiti Malaya

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering

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