期刊
NANOMATERIALS
卷 9, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/nano9050762
关键词
order-disorder transition; Seebeck coefficient; kesterite; CZTS; nanostructured materials; thermoelectric materials; crystal structure symmetry
类别
资金
- Autonomous Province of Trento
- European Commission [785219]
- FET Proactive Neurofibres [732344]
- Italian Ministry of Education, University and Research (MIUR), under the Departments of Excellence [L. 232/2016, ARS01-01384-PROSCAN]
Bulk samples of kesterite (Cu2ZnSnS4, CZTS) were produced by cold-pressing and sintering of CZTS powders obtained via reactive ball-milling. An increase in the Seebeck coefficient of more than 100 mu V/K, almost doubling the expected value, is noticed around a temperature of 260 degrees C. As pointed out by thermal analyses, this is due to a second order transition of kesterite from an ordered I-4 to a disordered I-42m crystal structure. Conversely to what happens for solar cell materials, where the transition is considered to be detrimental for the performance, it appears to be beneficial for the thermoelectric Seebeck coefficient, suggesting that higher crystal symmetry and cation-disorder due to the transition lead to thermopower enhancement.
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