Journal
SOLAR ENERGY
Volume 119, Issue -, Pages 225-232Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2015.07.004
Keywords
Amorphous Si; Hydrogenation; Heat treatments; Solar cells; IR Spectroscopy; Voids
Categories
Funding
- CNR (Italy) [MTA 1102]
- MTA (Hungary) [MTA 1102]
- OTKA [K-67969, NF 101329, NK 105691]
- European Union
- European Social Fund
- [TAMOP 4.2.2.A-11/1/KONV-2012-0036]
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Photovoltaic (PV) solar cells and photovoltaic thermal (PVT) hybrid devices very often employ hydrogenated a-Si (a-Si:H) because of its cost effectiveness and better performance as light absorber. The properties of a-Si:H can be improved by heat treatments that also help to recover the Staebler Wronski effect. Here the effect of heat treatments on the behavior of H is discussed. It is shown that, upon annealing, the grown-in SiH monohydride groups are partially transformed into SiH2 dihydrides and polysilane chains which have been reported to impair the performance of a-Si:H based PV(T) devices. Since the polyhydrides reside on the surface of voids the increase of their density also affects the a-Si:H layer morphology by the formation of blisters due to the increased volume of the voids. The influence of such changes of the H bonding configuration and of the morphological structure on the performance of PV(T) devices is discussed. (C) 2015 Elsevier Ltd. All rights reserved.
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