Nano Archive

Ordered vacancy compounds and nanotube formation in CulnSe(2)-CdS core-shell nanowires

Peng, Hailin and Xie, Chong and Schoen, David T. and McIlwrath, Kevin and Zhang, Xiao Feng and Cui, Yi (2007) Ordered vacancy compounds and nanotube formation in CulnSe(2)-CdS core-shell nanowires. NANO LETTERS, 7 (12). pp. 3734-3738.

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CulnSe(2) related materials-based heterojunction diodes have received much attention, owing to their highest power conversion efficiency (19.5%) among all the thin-film solar cell technologies. Important issues on the microstructure and formation mechanism of CulnSe(2)-CdS p-n heterojunction persist due to the complexity of polycrystalline films and invasive sample preparation for characterization. Here, we investigated the microstructure, chemical composition, and formation mechanism of the junction with CulnSe(2)-CdS core-shell nanowires, where nanowire geometry affords single-crystalline nanograins for direct characterization. A coherent CdS shell can be epitaxially deposited onto the CulnSe(2) nanowire with chemical bath deposition even at 60 degrees C. For the first time, ordered vacancy compound nanodomains induced by fast outward diffusion of Cu ions were directly observed near the interface of epitaxial CIS-CdS heterostructure. The core-shell nanowires can be transformed into nanotubes with chemical bath deposition progression through a nanoscale Kirkendall effect. Our results provide important understanding of CulnSe(2)-CdS heterojunctions for developing better CulnSe(2) solar cells.

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Material Science > Nanochemistry
Engineering > Nanotechnology applications in ICT
ID Code:433
Deposited By:Farnush Anwar
Deposited On:05 Dec 2008 15:51
Last Modified:05 Dec 2008 16:04

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