A NEW TECHNIQUE FOR INCREASING EFFICIENCY OFSILICON SOLAR CELLS

摘要

A new type of photovoltaic system with higher generation power density has beenstudied in detail. The feature of the system is a V-shaped module (VSM) with two tiltedmonocrystalline solar cells. Compared to solar cells in a flat and tilted at a fixed 30~0fromhorizontal orientation, the VSM enhances external quantum efficiency and leads to anincrease 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/cm~2, but both fill factor andopen-circuit voltage were approximately unchanged. For the VSM similar results (about35% increases) were obtained for solar cells fabricated by using mono-crystalline siliconwafers with only conventional background impurities.