TAILIEUCHUNG - Solar Cells Thin Film Technologies Part 11

Tham khảo tài liệu 'solar cells thin film technologies part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Computer Modeling of Heterojunction with Intrinsic Thin Layer HIT Solar Cells Sensitivity Issues and Insights Gained 289 40 _l 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1. 38 s j So to e 1111111111 36 - - 34 b 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 32 Temperature C I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 22 20 18 16 d 0 20 40 60 80 Temperature C Fig. 8. Variation of a Voc b Jsc c FF and d Efficiency as a function of temperature in N-c-Si HIT solar cells having different thickness of the undoped a-Si H layer half normal double triple at the P-a-Si H N-c-Si interface. The lines are modeling results while symbols correspond to measured data. lower temperatures also means that the cell is now more resistive resulting in a fall in the FF for the cells double and triple Fig. 8c where performance is dominated by the undoped a-Si H layer. Also for the value of the band gap assumed for the I-a-Si H layer Table 8 the holes are able to overcome the positive field barrier at the a-Si c-Si interface by thermionic emission to get collected at the front contact. Thermionic emission decreases at lower temperatures resulting in a loss of FF for cells double and triple . For cells Normal and Half performance is dominated by the temperature-independent resistance of the contacts therefore no fall in FF is seen. Finally Fig. 8 b indicates that the calculated Jsc is constant with temperature while the measured Jsc increases slightly. This is because the model does not take account of the temperature dependence of the band gap and absorption coefficient of the materials. Effect of I-a-Si H buffer layers on the performance of N- type HIT solar cells HIT solar cells give efficiencies comparable to those of c-Si cells because of the amazing passivating properties of the intrinsic a-Si H layers. In fact it is this layer that gives this group of solar cells its name - HIT . We .

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