Microstructure of Amorphous-Silicon-Based Solar Cell Materials by Small-Angle X-Ray Scattering - Brossura

Brossura

ISBN 10: 1249201527 ISBN 13: 9781249201526

Casa editrice: Bibliogov, 2012

Riassunto

This report describes work performed to provide details of the microstructure in high-quality hydrogenated amorphous silicon and related alloys for the nanometer size scale. The materials studied were prepared by current state-of-the-art deposition methods, as well as new and emerging deposition techniques. The purpose was to establish the role of microstructural features in controlling the opto-electronic and photovoltaic properties. The approach centered around the use of the uncommon technique of small-angle X-ray scattering (SAXS), which is highly sensitive to microvoids and columnar-like microstructure. Nanovoids of H-rich clusters with 1 to 4 nm sizes in a-Si:H at the 1 vol. percent level correlate with poor solar-cell and opto-electronic behavior. Larger-scale features due either to surface roughness or residual columnar-like structures were found in present state-of-the-art device material. Ge alloying above about 10 to 20 at. percent typically leads to significant increases in heterogeneity, and this has been shown to be due in part to non-uniform Ge distributions. Ge additions also cause columnar-like growth, but this can be reduced or eliminated by enhanced ion bombardment during growth. In contrast, C alloying typically induces a random nanostructure consisting of a narrow size distribution of 1-nm-sized objects with a high density, consistent with the notably poorer opto-electronic behavior of these alloys.

Dettagli dell'edizione

• Editore: Bibliogov
• Data di pubblicazione: 2012
• Lingua: Inglese
• ISBN 10: 1249201527
• ISBN 13: 9781249201526
• Rilegatura: Copertina flessibile
• Numero di pagine: 54
• Contatto del produttore: non disponibile
• Persona responsabile: KreGa Onlinehandel GmbH; 4950000000000; info@krega-onlinehandel.de; ; Birkenweg 31; Brakel; 33034; Germania