USA: Developing a new method of increasing efficiency of solar cells - Solar energy & PV news

USA: Developing a new method of increasing efficiency of solar cells

Published on Solar energy & PV  |  September 24, 2010, 9:42

U.S. researchers at NREL have developed a process for stimulating the solar cells at low cost.


They have carved hundreds of billions of nanoscale holes in a silicon wafer. The purpose of this process is to convert silver silicon to black silicon.

The more holes are etched more deeply, the more silicon becomes darker until it becomes black enough to absorb almost all wavelengths of the light spectrum.

By their method, the researchers poured onto silicon wafers acid - H (AuCl4), hydrofluoric acid - HF, and hydrogen peroxide (hydrogen peroxide) - H2O2.


Under the effect of acids, smooth surface of silicon is pierced with many holes,  silver silicon turns color in black.

According to NREL, using black silicon reduces photovoltaic conversion costs by 4-8%.

For 16.8% cell efficiency, according to researchers at NREL, the whole depth should be an average of 500 nanometers, and their diameter remains below the lowest wavelength of the light spectrum and is forty times smaller than the thickness of a human hair.


Digg this   Slashdot Slashdot   Del.icio.us   StumbleUpon   Yahoo MyWeb   Google Bookmarks   Twitter   Facebook

Rate this       Low   High
 Print       Email      IM