High Open-circuit Voltage Tandem a-Si:H p-i-n Solar Cells in Series on Flexible Substrate
Date Issued
2008
Date
2008
Author(s)
Lin, Hui-Wen
Abstract
One a-Si:H p-i-n solar cell can only provide open-circuit voltage Voc~0.7V. In this thesis, to achieve higher open-circuit voltage for the application as a power supply for electronic paper, the tandem a-Si:H p-i-n solar cell is used to increase the Voc. After the theoretical calculation of film thickness and a series of process improvement, the open-circuit voltage of the double-junction tandem solar cell could be increased to 1.51 V. In order to get higher Voc, the triple-junction a-Si:H p-i-n solar cell is fabricated, and the Voc is raised to 2.06 V. For practical applications in flexible electronics, the Voc of the solar cell is better to be larger than 10 V. Therefore, the nine triple-junction solar cells connected in series have been developed. Furthermore, for the integration with flexible devices, such as electronic paper, the glass substrate for nine triple-junction solar cells is replaced by the plastic substrate. Finally, nine cells in series on the plastic substrate has been fabricated successfully and its Voc of that achieves 13.8 V.
Subjects
a-Si:H
Solar cell
Open-circuit voltage
Type
thesis
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