A new type of photovoltaic system with higher generation power density has been studied in detail. The feature of the system is a V-shaped module (VSM) with two tilted monocrystalline solar cells. Compared to solar cells in a flat and tilted at a fixed 300 from horizontal orientation, the VSM enhances external quantum efficiency and leads to an increase of 30 to 35% in power conversion efficiency. Due to the VSM technique, short-circuit current density was raised from 25.94 to 34.7 mA/cm2, but both fill factor and open-circuit voltage were approximately unchanged. For the VSM similar results (about 35% increases) were obtained for solar cells fabricated by using mono-crystalline silicon wafers with only conventional background impurities.
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