In the recent years, world’s energy and environmental
issues caused by limited fossil resources and severe pollution
problems have spurred tremendous efforts on searching
new sustainable electricity generation technologies.
Especially in China, the people are now suffering from
the serious environmental pollution and electricity shortage.
On the other hand, China has large areas with abundant
solar source, particularly in the northwest of the
country, where most area is the wasteland and suitable
for solar energy applications (Qu et al., 2008). Accordingly,
the development of the solar-powered electricity technologies
attracts significant attentions in China.