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But where's the market for frequency inverter?

I think different demands exists in different areas. The requirements for frequency inverter in Japan may be different from that in India. The requirements for frequency inverters in USA are different from Mexico. So different qualities meet the demands of different countries because of the cost.

The discovery that butterfly wings have scales that act as tiny solar collectors has led scientists in China and Japan in Asia to design a more efficient solar cell that could be used for powering homes, businesses, and other applications in the future.

In the study, Di Zhang of the State Key Lab of Metal Matrix Composites at Shanghai Jiao Tong University and colleagues note that scientists are searching for new materials to improve light-harvesting in so-called dye-sensitized solar cells, also known as Gratzel cells for inventor Michael Gratzel. These cells have the highest light-conversion efficiencies among all solar cells - as high as 10%.