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Structural and optical properties of ZnSe thin films stacked with PbSe submonolayers

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Abstract

Structural and optical properties of Zinc Selenide (ZnSe) thin films stacked with multiple Lead Selenide (PbSe) submonolayers (ML) were studied. Thermal evaporation was preferred to produce ZnSe–PbSe thin films with the PbSe ML thickness ranges from 2.5 to 10 nm. Polycrystalline nature of the ZnSe was revealed through high resolution X-ray diffractometer measurement. The development of micro strain at the interfaces with increasing PbSe ML thickness was observed. A cross-sectional TEM image shows well-ordered periodicity and reproducibility of the layer thickness. The enhancement of optical absorption of ZnSe was identified upon stacking of PbSe ML. The evidence for quantum confinement in PbSe ML was revealed by the obtained red shift in band gap (2.5–1.8 eV) values as well as photoluminescence emission at 1,071 nm. The presence of tensile strain in the ZnSe layers upon staking of PbSe ML was discussed by the shift in LO phonon modes in Raman spectra.

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Acknowledgments

Authors acknowledge the research council of Norway for providing Yggdrsail mobility grant (Project No: 219721/F11) to carry out TEM analysis at TEM Gemini centre, Norwegian University of Science and Technology, Norway. We extend our grateful to CRF, IIT Kharagpur and Department of Nanoscience and Technology, Bharathiar University for HRXRD and Raman measurements respectively.

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  1. Department of Physics, Karunya University, Coimbatore, 641 114, India

    M. Manonmani Parvathi, V. Arivazhagan & S. Rajesh

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  1. M. Manonmani Parvathi
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  2. V. Arivazhagan
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  3. S. Rajesh
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Correspondence to S. Rajesh.

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Manonmani Parvathi, M., Arivazhagan, V. & Rajesh, S. Structural and optical properties of ZnSe thin films stacked with PbSe submonolayers. Appl. Phys. A 116, 1773–1778 (2014). https://doi.org/10.1007/s00339-014-8326-2

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  • DOI: https://doi.org/10.1007/s00339-014-8326-2

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