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Wide band-gap tuning Cu2ZnSn1−xGexS4 single crystals: Optical and vibrational properties.

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Title: Wide band-gap tuning Cu2ZnSn1−xGexS4 single crystals: Optical and vibrational properties.
Authors: Garcia-Llamas, E.1 eduard.garcia@uam.es, Merino, J.M.1, Serna, R.2, Fontané, X.3, Victorov, I.A.4, Pérez-Rodríguez, A.5, León, M.1, Bodnar, I.V.6, Izquierdo-Roca, V.2, Caballero, R.1 raquel.caballero@uam.es
Source: Solar Energy Materials & Solar Cells. Dec2016 Part 2, Vol. 158, p147-153. 7p.
Subject Terms: *Kesterite, Band gaps, Single crystals, Crystal optics, Vibration (Mechanics), Germanium
Abstract: The linear optical properties of Cu 2 ZnSn 1− x Ge x S 4 high quality single crystals with a wide range of Ge contents ( x =0.1, 0.3, 0.5, 0.7, 0.9 and 1) have been investigated in the ultraviolet and near infrared range using spectroscopic ellipsometry measurements. From the analysis of the complex dielectric function spectra it has been found that the bandgap E 0 increases continuously from 1.49 eV to 2.25 eV with the Ge content. Furthermore, the evolution of the interband transitions E 1A and E 1B has been also determined. Raman scattering using three different excitation wavelengths and its analysis have been performed to confirm the absence of secondary phases in the samples, and to distinguish between stannite, wurtzite, wurzstannite and kesterite structures. Additionally, the analysis of the high resolution Raman spectra obtained in samples with different [Ge]/([Ge]+[Sn]) ratios allows describing a bimodal behavior of the dominant A modes. The understanding of the incorporation of Ge into the Cu 2 ZnSnS 4 lattice is fundamental in order to develop efficient bandgap engineering of these compounds towards the fabrication of kesterite based solar cells with enhanced performance. [ABSTRACT FROM AUTHOR]
Copyright of Solar Energy Materials & Solar Cells is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Wide band-gap tuning Cu2ZnSn1−xGexS4 single crystals: Optical and vibrational properties.
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  Data: <searchLink fieldCode="AR" term="%22Garcia-Llamas%2C+E%2E%22">Garcia-Llamas, E.</searchLink><relatesTo>1</relatesTo><i> eduard.garcia@uam.es</i><br /><searchLink fieldCode="AR" term="%22Merino%2C+J%2EM%2E%22">Merino, J.M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Serna%2C+R%2E%22">Serna, R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fontané%2C+X%2E%22">Fontané, X.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Victorov%2C+I%2EA%2E%22">Victorov, I.A.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Pérez-Rodríguez%2C+A%2E%22">Pérez-Rodríguez, A.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22León%2C+M%2E%22">León, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bodnar%2C+I%2EV%2E%22">Bodnar, I.V.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Izquierdo-Roca%2C+V%2E%22">Izquierdo-Roca, V.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Caballero%2C+R%2E%22">Caballero, R.</searchLink><relatesTo>1</relatesTo><i> raquel.caballero@uam.es</i>
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  Data: <searchLink fieldCode="JN" term="%22Solar+Energy+Materials+%26+Solar+Cells%22">Solar Energy Materials & Solar Cells</searchLink>. Dec2016 Part 2, Vol. 158, p147-153. 7p.
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  Data: *<searchLink fieldCode="DE" term="%22Kesterite%22">Kesterite</searchLink><br /><searchLink fieldCode="DE" term="%22Band+gaps%22">Band gaps</searchLink><br /><searchLink fieldCode="DE" term="%22Single+crystals%22">Single crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+optics%22">Crystal optics</searchLink><br /><searchLink fieldCode="DE" term="%22Vibration+%28Mechanics%29%22">Vibration (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Germanium%22">Germanium</searchLink>
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  Label: Abstract
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  Data: The linear optical properties of Cu 2 ZnSn 1− x Ge x S 4 high quality single crystals with a wide range of Ge contents ( x =0.1, 0.3, 0.5, 0.7, 0.9 and 1) have been investigated in the ultraviolet and near infrared range using spectroscopic ellipsometry measurements. From the analysis of the complex dielectric function spectra it has been found that the bandgap E 0 increases continuously from 1.49 eV to 2.25 eV with the Ge content. Furthermore, the evolution of the interband transitions E 1A and E 1B has been also determined. Raman scattering using three different excitation wavelengths and its analysis have been performed to confirm the absence of secondary phases in the samples, and to distinguish between stannite, wurtzite, wurzstannite and kesterite structures. Additionally, the analysis of the high resolution Raman spectra obtained in samples with different [Ge]/([Ge]+[Sn]) ratios allows describing a bimodal behavior of the dominant A modes. The understanding of the incorporation of Ge into the Cu 2 ZnSnS 4 lattice is fundamental in order to develop efficient bandgap engineering of these compounds towards the fabrication of kesterite based solar cells with enhanced performance. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Solar Energy Materials & Solar Cells is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.solmat.2015.12.021
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        Type: general
      – SubjectFull: Band gaps
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      – SubjectFull: Single crystals
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              Text: Dec2016 Part 2
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