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Variations of ionization potential and electron affinity as a function of surface orientation: The case of orthorhombic SnS.
- Source :
-
Applied Physics Letters . 5/26/2014, Vol. 104 Issue 21, p1-4. 4p. 1 Diagram, 2 Charts, 1 Graph. - Publication Year :
- 2014
-
Abstract
- We investigated the dependence of absolute SnS band-edge energies on surface orientation using density functional theory and GW method for all surfaces with Miller indices -3 ≤ h; k; l ≤ 3 and found variations as large as 0.9 eV as a function of (hkl). Variations of this magnitude may affect significantly the performance of photovoltaic devices based on polycrystalline SnS thin-films and, in particular, may contribute to the relatively low measured open circuit voltage of SnS solar cells. X-ray diffraction measurements confirm that our thermally evaporated SnS films exhibit a wide distribution of different grain orientations, and the results of Kelvin force microscopy support the theoretically predicted variations of the absolute band-edge energies. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 104
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 96296516
- Full Text :
- https://doi.org/10.1063/1.4879558