Cell conversion efficiency

Sanyo Dell Battery Electric in solar cell technology of the International Society “EU PVSEC”, published on both sides in the single crystal silicon wafer after the formation of amorphous silicon film made of HIT (heterojunction with intrinsic thin layer)-type cell, and to cell conversion efficiency of increased to 22.3%. The company in June 2007 has just published the conversion dell 1691P efficiency from 21.8% to 22.0% results.

Conversion efficiency due to open circuit voltage (Voc) and short-circuit current (Isc) increase. In June 2007 published results, by improving the monocrystalline silicon surface cleaning methods, reducing the surface defects that lead to loss of carrier to bring the combination of reasons, from the previous open-circuit voltage of 0.718V to 0.722V. In addition, optimized for the aggregation of light cell surface of uneven size and shape, the short-circuit current increased from dell 3r305 the previous 38.37mA/cm2 to 38.64mA/cm2.

The results published in the EU PVSEC, the most optimized the shape of the gate electrode, an increase of short-circuit current. Gate electrode is formed by silver paste printing. If the penetration of printing paste, the electrode width will be increased, will be followed by the light area is reduced. The adoption of improved materials and printing methods, successfully formed a narrow width and high reliability of the dell 6Y270 electrodes.

The eventual realization of the target are as follows: short-circuit current 39.09mA/cm2, open circuit voltage of 0.725V, curve factor of 79.1%, unit conversion efficiency of 22.3%. Laboratories use a cell area of 100.5cm2 with dell 75uyf.

Sanyo Electric plans on the basis of the above-mentioned results, as of 2010 year, the HIT solar cell conversion efficiency of the unit volume of product from the current 19.7% to 22% or more Apple IBook G4 AC Adapter 65Wh/45Wh. By then, will strive to make the conversion efficiency in the study reaches more than 23%.