Open Access Nano Express

Structural variations of Si1−x C x and their light absorption controllability

Jihyun Moon12, Seung Jae Baik3*, Byungsung O2 and Jeong Chul Lee1*

Author Affiliations

1 KIER-UNIST Advanced Center for Energy, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 305-343, South Korea

2 Department of Physics, Chungnam National University, Yuseong-gu, Daejeon, 305-764, South Korea

3 Department of Electrical, Electronic, and Control Engineering, Hankyong National University, Anseong-si, Gyeonggi-do, 456-749, South Korea

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Nanoscale Research Letters 2012, 7:503  doi:10.1186/1556-276X-7-503

Published: 6 September 2012

Abstract

The emergence of third-generation photovoltaics based on Si relies on tunable bandgap materials with embedded nanocrystalline Si. One of the most promising approaches is based on the mixed-phase Si1 − xCx. We have investigated the light absorption controllability of nanocrystalline Si-embedded Si1 − xCx produced by thermal annealing of the Si-rich Si1 − xCx and composition-modulated superlattice structure. In addition, stoichiometric SiC was also investigated to comparatively analyze the characteristic differences. As a result, it was found that stoichiometric changes of the matrix material and incorporation of oxygen play key roles in light absorption controllability. Based on the results of this work and literature, a design strategy of nanocrystalline Si-embedded absorber materials for third-generation photovoltaics is discussed.

Keywords:
Nanocrystalline Si; Solar cell; Silicon carbide; Light absorption; Superlattice; PACS; 78.20. + e; 78.30.Ly; 78.40.Fy.