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Table 4

Solar cell output of pm-Si:H solar cells, deposited in the NIP configuration, but with the light entering on the P-side. The first row gives our best experimental results [19], while the rest are model calculations. In the second row, properties of pm-Si:H deposited at 175 C are used, while in the rest those of pm-Si:H deposited at 210 C are used. ZnO in the table corresponds to aluminium-doped ZnO. The subsequent lines show the effect of different window layers and back contacts in the initial and light-stabilised states. The ZnO:Al/P-μc-SiOx sbb is taken =0.2 eV. The last two rows show the effect of using MgF2 ARC on ZnO:Al. Thickness of the pm-Si:H layer is 250 nm except for the last case where it is 150 nm.

Cell type Jsc (mA cm-2) Voc (volts) FF Efficiency (%)

Expt: ITO/P-μc-Si/P-μc-SiOx/ Initial 15.7 0.95 0.63 9.3
I-pm-Si:H/N-a-Si:H/SnO2:F/glass Stabilised 15.0 0.93 0.60 8.2

ZnO/P-μc-Si/P-a-SiC/I-pm-Si:H Initial 13.31 0.985 0.792 10.39
(175 C)/N-a-Si:H/ZnO/Ag/glass Stabilised 13.22 0.980 0.744 9.63

ZnO/P-μc-Si/P-a-SiC/I-pm-Si:H Initial 14.48 0.987 0.792 11.32
(210 C)/N-a-Si:H/ZnO/Ag/glass Stabilised 14.38 0.982 0.743 10.5

ZnO/P-μc-Si/P-μc-SiOx/I-pm-Si:H/ Initial 15.02 1.106 0.748 12.43
N-a-Si:H/ZnO/Ag/glass Stabilised 14.89 1.061 0.694 10.97

ZnO/P-μc-Si/P-μc-SiOx/I-pm-Si:H/ Initial 15.29 1.140 0.772 13.45
N-μc-SiOx/ZnO/Ag/glass Stabilised 15.15 1.073 0.701 11.40

ZnO/P-μc-SiOx/I-pm-Si:H/ Initial 15.89 1.124 0.760 13.56
N-μc-SiOx/ZnO/Ag/glass Stabilised 15.74 1.057 0.687 11.43

MgF2/ZnO/P-μc-SiOx/I-pm-Si:H/ Initial 16.64 1.125 0,759 14.20
N-μc-SiOx/ZnO/Ag/glass Stabilised 16.49 1.059 0.686 11.98

MgF2/ZnO/P-μc-SiOx/ Initial 15.98 1.129 0.764 13.78
I-pm-Si:H/N-μc-SiOx/ZnO/Ag/glass Stabilised 15.92 1.080 0.714 12.27

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