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The Effects of Hydrogen Dilution on VOC in a-Si:H Pin Solar Cells

Published online by Cambridge University Press:  15 February 2011

Qi Wang ,
Richard S. Crandall  and
Daxing Han
Qi Wang
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401–3305
Richard S. Crandall
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401–3305
Daxing Han
Affiliation:
Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599–3255
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Abstract

We study the effects of hydrogen dilution on the open circuit voltage of a-Si:H pin solar cells fabricated by rf glow discharge growth. We keep the p and n layers the same and only vary the i layer properties. A normal a-Si:H i layer, an H-diluted i layer, and a thin H-diluted layer inserted between p and normal i layer are selected for this study. We measure the JV characteristics and the internal electric field distribution using a transient-null-current technique both in annealed and light soaked states. We find that hydrogen dilution does stabilize the Voc either in a bulk H-diluted i layer or in a thin layer between p and normal i layer after 100 hours AMI sun light soaking. From dark IV measurement, both H-diluted cells show little change in current at voltage near Voc before and after light soaking; while the normal a-Si:H cell does show a noticeable change. Also the internal field measurements find a stronger electric field starting from p and i interface for both H-diluted cells compared to the normal a-Si:H cell. Furthermore, there are no measurable changes in the field profiles after 100 hour AMI light-soaking for both H-diluted and normal a-Si cells. All these suggest that hydrogen dilution increases the field strength near p and i interface, which is the key that leads to a more stable Voc of H-diluted cells.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 467: Symposium A – Amorphous and Microcrystalline Silicon Technology - 1997 , 1997 , 753
Copyright
Copyright © Materials Research Society 1997

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