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Enhanced thermopower in (013)-oriented silver selenide films produced by thermal annealing

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Abstract

Nanocrystalline thin films of thermoelectric compound Ag2Se (AS) were deposited on the glass substrate kept at room temperature by thermal evaporation technique. Deposited films were annealed in vacuum of 2 × 10–5 mbar at 90 °C, 120 °C, 150 °C, 180 °C and 210 °C for 1 h. A sudden change in crystal orientation from (121) to (013) was observed as annealing temperature was increased to 210 °C. Seebeck coefficient for (013) oriented film was also found to be − 114.6 μV/K at room temperature compared to − 62.3 μV/K for as-deposited film. Formation of silver segregates in the film was observed where variation of size of silver grains on annealing played a crucial role in optimising Seebeck coefficient. Energy filtering effect by silver grains in combination to (013) orientation of silver selenide crystals was inferred as a reason for enhancement of Seebeck coefficient. Room temperature value of power factor was optimised at annealing temperature of 120 °C (AS-120) which was calculated to be 755.0 μW/mK2 and was also found to be comparable to that of film annealed at 210 °C (AS-210) i.e., 705.6 μW/mK2. Unlike AS-120, power factor value of AS-210 was due to considerable value Seebeck coefficient.

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Acknowledgements

One of the co-authors Sukhdeep Singh is thankful to Council of Scientific and Industrial Research (CSIR) for providing fellowship.

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Authors and Affiliations

  1. Department of Physics, Panjab University, Chandigarh, 160014, India

    Silky Jindal, Sukhdeep Singh, G. S. S. Saini & S. K. Tripathi

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  1. Silky Jindal
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  2. Sukhdeep Singh
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  3. G. S. S. Saini
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  4. S. K. Tripathi
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Correspondence to S. K. Tripathi.

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Jindal, S., Singh, S., Saini, G.S.S. et al. Enhanced thermopower in (013)-oriented silver selenide films produced by thermal annealing. Appl. Phys. A 126, 374 (2020). https://doi.org/10.1007/s00339-020-03534-1

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