التفاصيل البيبلوغرافية
| العنوان: |
The effect of stoichiometry on Cu-Zn ordering kinetics in Cu2ZnSnS4 thin films. |
| المؤلفون: |
Rudisch, Katharina, Davydova, Alexandra, Platzer-Björkman, Charlotte, Scragg, Jonathan |
| المصدر: |
Journal of Applied Physics; 2018, Vol. 123 Issue 16, pN.PAG-N.PAG, 10p, 3 Diagrams, 2 Charts, 5 Graphs |
| مصطلحات موضوعية: |
ELECTRIC properties of zinc sulfide, STOICHIOMETRY, SOLAR cells, THIN films, VACANCIES in crystals |
| مستخلص: |
Cu-Zn disorder in Cu2ZnSnS4 (CZTS) may be responsible for the large open circuit voltage deficit in CZTS based solar cells. In this study, it was investigated how composition-dependent defect complexes influence the order-disorder transition. A combinatorial CZTS thin film sample was produced with a cation composition gradient across the sample area. The graded sample was exposed to various temperature treatments and the degree of order was analyzed with resonant Raman spectroscopy for various compositions ranging from E- and A-type to B-, F-, and C-type CZTS. We observe that the composition has no influence on the critical temperature of the order-disorder transition, but strongly affects the activation energy. Reduced activation energy is achieved with compositions with Cu/Sn > 2 or Cu/Sn < 1.8 suggesting an acceleration of the cation ordering in the presence of vacancies or interstitials. This is rationalized with reference to the effect of point defects on exchange mechanisms. The implications for reducing disorder in CZTS thin films are discussed in light of the new findings. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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