Technique for the Rapid and Accurate Determination of Solar Cell Performance Parameters
Original Publication Date: 1980-Dec-01
Included in the Prior Art Database: 2005-Feb-12
The current-voltage (I-V) curve in Fig. 1 completely describes the solar cell characteristics under light. The performance parameters of interest are solar cell efficiency (n), fill factor (FF), open circuit voltage (V(oc)) and short circuit (I(sc)). The efficiency is defined as follows: n = Maximum power output over power input = P(M)/P(in) The fill factor (FF) is a measure of the squareness of the I-V curve and is defined as follows: FF = V(M) I(M) over V(oc)I(sc). Open circuit voltage (V(oc)) and short circuit current (I(sc)) are illustrated in Fig. 1. Values of voltage V(M) corresponding to the maximum power point are not sharply defined and are often determined by curve-fitting experimental points to computer generated I-V data. The set-up schematically shown in Fig.