Design of quaternary chalcogenide photovoltaic absorbers through cation mutation
Walsh, A., Wei, S. H., Chen, S. Y. and Gong, X. G., 2009. Design of quaternary chalcogenide photovoltaic absorbers through cation mutation. In: 2009 34th IEEE Photovoltaic Specialists Conference, Vols 1-3. New York: IEEE, pp. 1803-1806. (IEEE Photovoltaic Specialists Conference)
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Design of chalcogenide photovoltaic absorbers is carried out systematically through sequential cation mutation, from binary to ternary to quaternary compounds, using first-principles electronic structure calculations. Several universal trends are identified for two classes of quaternary chalcogenides (I(2)-II-IV-VI(4) and I-III-II(2)-VI(4) systems). For example, the lowest-energy structure always has larger lattice constant a, smaller tetragonal distortion parameter n = c/2a, and larger band gap than the metastable structures for common-row cation mutations. The band structure changes on mutation illustrate that although the band gap decreases from binary II-VI to ternary I-III-VI(2) are mostly due to the p-d repulsion in the valence band, the decreases from ternary I-III-VI(2) to quaternary I(2)-II-IV-VI(4) chalcogenides are due to the downshift in the conduction band caused by the wavefunction localization on the group IV cation site. We find that I(2)-II-IV-VI(4) compounds are more stable in the kesterite structure, whereas the widely-assumed stannite structure reported in the literature is most likely due to partial disorder in the I-II (001) layer of the kesterite phase. Ten compounds are predicted have band gaps close to the 1 to 2 eV energy window suitable for photovoltaics.
|Item Type||Book Sections|
|Creators||Walsh, A., Wei, S. H., Chen, S. Y. and Gong, X. G.|
|Uncontrolled Keywords||band offsets, augmented-wave method|
|Departments||Faculty of Science > Chemistry|
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