Structural homogenization and cation ordering in CZTS films during sulfurization as probed via in-situ Raman

THIN SOLID FILMS

卷:684

Article

Exarhos, S.¹  Palmes, E.²  Mangolini, L.^1,2 

[1] Univ Calif Riverside, Bourns Coll Engn, Mech Engn Dept, 900 Univ Ave, Riverside, CA 92521 USA

[2] Univ Calif Riverside, Bourns Coll Engn, Mat Sci & Engn Program, 900 Univ Ave, Riverside, CA 92521 USA

关键词: Copper-zinc-tin-sulfide;    In situ;    Raman;    Thin film;    Kesterite;   

DOI  :  10.1016/j.tsf.2019.05.048

来源: Elsevier

【 摘 要 】

In this work, we investigate the production of copper-zinc-fin-sulfide (CZTS) thin films via the sintering of nanoparticle coatings. CZTS nanoparticles are produced via spray pyrolysis starting from a solution of metal salts and thiourea. This approach yields small particles that are easy to disperse and apply onto the desired substrate. Sintering these coatings into large-grained films, however, is not trivial. We have used a sodium disulfidedipping technique that facilitates large-scale grain growth and high-phase purity after annealing in a sulfur atmosphere. We have also utilized a custom-built apparatus to perform in situ Raman spectroscopy on closed systems in volatile and corrosive environments at high temperatures. With this apparatus, we have observed the growth of long-range-ordered crystal domains at high temperature. We have found that precise control of the cooling rate is highly beneficial for cation ordering in large grain CZTS, and that cation re-ordering and phase rehomogenization in large grain CZTS are possible via low-temperature post-processing. This study highlights the fact that much is still not understood about the kinetics of phase evolution for this complex quaternary system during thermal processing, and that well-designed in-situ characterization techniques are necessary to overcome this fundamental lack of knowledge.

【 授权许可】

Free