1. National Nano Device Laboratories; National Applied Research Laboratories; 26, Prosperity Road I Hsinchu 30078 Taiwan
2. Department of Applied Materials and Optoelectronic Engineering; National Chi Nan University; No. 1, University Road Puli, NanTou 54561 Taiwan
3. Department of Applied Chemistry; National Chi Nan University; No. 1, University Road Puli, NanTou 54561 Taiwan