Optical properties and sub-bandgap formation of nano-crystalline Si quantum dots embedded ZnO thin film

Optics Express
Kuang-Yang KuoPo-Tsung Lee

Abstract

In this study, we fabricate ZnO thin films with nano-crystalline Si (nc-Si) quantum dots (QDs) using a ZnO/Si multilayer deposition structure and a post-annealing process, and the formation of high crystallinity of Si QDs embedded in the crystalline ZnO matrix is demonstrated. For optical properties, the essential features of ZnO material, high transmission in long-wavelength and high absorption in short-wavelength ranges, are preserved. We observe significantly enhanced light absorption and an unusual photoluminescence emission peak contributed from the nc-Si QDs in the middle-wavelength range. In addition, we confirm the formation of optical sub-bandgap and the obtained value is quite close to the unusual PL emission peak. We show that meaningful sub-bandgap can form in ZnO thin film by embedding nc-Si QDs while maintaining the advantageous properties of ZnO matrix. This newly developed composite material, nc-Si QD embedded ZnO thin films, can be useful for various electro-optical applications.

References

Nov 26, 2008·Optics Express·Yun-Pei ChanWen-Feng Hsieh
Jun 18, 2008·Nanotechnology·Eun-Chel ChoMartin A Green

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Citations

Sep 18, 2012·Nanoscale Research Letters·Numan SalahZishan H Khan
Oct 10, 2013·Optics Express·Kung-Hsuan LinYu-Ming Chang
May 9, 2012·Optics Express·Kwang-Sup LeeChee Hing Tan

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