Cui Rongqiang

Over 14% Efficient Mc-Si Solar Cells from 100% Solar Grade Silicon in a Metallurgical Process Route

Because of the shortage of high pure silicon and the development of manufacturing solar grade silicon in a metallurgical process route, we applied a reliable industrial process on 12.5×12.5 cm2 wafers from solar grade silicon feedstock in metallurgical process (SoG-Si) and analyzed the difference of solar cells manufactured in conventional process from electronic grade silicon (EG-Si) and SoG-Si. The electrical performance between them was compared. We had tested samples in many aspects in order to master the specialty of this feedstock and the production technology.

Amorphous Hydrogenated Carbon-Nitrogen Alloy Thin Films for Solar Cell Application

Amorphous hydrogenated carbon-nitrogen alloy (a-CNx:H) thin films have been deposited on silicon substrates by improved dc magnetron sputtering from a graphite target in nitrogen and hydrogen gas discharging. The films are investigated by using Raman spectroscopy, x-ray photoelectron spectroscopy, spectral ellipsometer and electron spin resonance techniques. The optimized process condition for solar cell application is discussed. The photovoltaic property of a-CNx:H/silicon heterojunctions can be improved by the adjustment of the pressure ratio of hydrogen to nitrogen and unbalanced magnetic field intensity. Open-circuit voltage and short-circuit current reach 300 mV and 5.52 mA/cm2, respectively.