Origin of the Voc enhancement with a p-doped nc-SiOx:H window layer in n-i-p solar cells

The introduction of a nc-SiOx:H material as window layer in single junction a-Si:H n-i-p solar cell leads to a Voc enhancement of 80 mV compared to a μc-Si:H p-layer. According to numerical modeling of the Voc, both the higher work function p-layer and the conduction band offset (CBO) at the i/p interface match well with the experimental Voc increase with the oxygen content. Using the differential temperature method, the builtin voltage (Vbi) of the cells with the two different p-layers is measured to be similar, agreeing well with the CBO model. Thus we attribute the improvement of the Voc to the reduction of recombination at the i/p interface, as a consequence of the CBO in this region.


Published in:
Journal of Non-Crystalline Solids, 358, 17, 1958-1961
Year:
2012
Publisher:
Amsterdam, Elsevier
ISSN:
0022-3093
Keywords:
Note:
IMT-NE Number:668
Laboratories:




 Record created 2012-09-26, last modified 2018-03-17

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