The optimization process proceeds to obtain the maximum efficiency of the MIS/IL solar cell by optimizing the cell parameters. The optimization process depends on the number of iterations needed to achieve the maximum efficiency of the cell. After 40 iterations (Fig.6), the efficiency reaches a maximum steady state value of 22.95 %. Table 1. shows the parameters required to achieve the this efficiency (data(1)). The table also includes the results of the optimization process by using aluminum as a contact metal ^m = 4.1). In this case, only five parameters are used for optimization (data(2)). The results of the optimization process when using aluminum as metal contact and with no external back bias (V=0) (is shown in data

(3) ). The optimization results are compared with a theoretical optimization based on an analysis of structure parameters [7]. The comparison has shown good agreement of the genetic algorithm optimization with the other mentioned method as shown in Table 2.

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Metal

Semiconductor

Fig.1. Schematic diagram of MIS/IL solar cell structure

Insulator

Deplation region

Fig.2. Energy band diagram of MIS/IL Solar cell

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Actual start value 0 0 0 0 Actual end value 1 1 1 1 Fig.4. The binary encoding of the MIS/IL solar cell parameters

Fig.5. The flow chart of the genetic algorithm for MIS/IL solar cells

Fig.3. Structure of MIS/IL solar cell parameters chromosome

MIS/IL Parameters chromosome

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Fig.6. The optimization process during 40 iterations.

Table 2. The comparison between three optimization process The model Present model Theoretical model —————- ► [7] Method used Genetic algprithm Analysis of structural parameters V«[mV] 735 715 J* [mA/cm1] 46.1 42 1060 1050 FF [%] S2 SI Efficiency [%] 22.95 20.5

Table 1. Parameters required to achieve the optimum efficiency Optimization N* Фи N„ N, V Optimum results (cmJ) (eV) (A°) (cm-’) (cm-’) (V) efficiency (%) Encoded data (1) 0110 0100 ООП 1111 0100 1110 22.95 Decoded data (1) 3xl016 3.4 20 5xlOn 3×10" 0.7 Encoded data (2) 0110 1011 ООП 1111 1010 1111 22.5 Decoded data (2) 3xl016 4.1 20 ЗїіО13 5xl013 0.75 Encoded data (3) 0110 1011 ООП 1111 0100 0000 21.95 Decoded data (3) 3xl016 4.1 20 5xlOn 5×10” 0