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@ARTICLE{Czaja:851557,
author = {Czaja, Philippe and Giusepponi, Simone and Gusso, Michele
and Celino, Massimo and Aeberhard, Urs},
title = {{C}omputational characterization of a-{S}i:{H}/c-{S}i
interfaces},
journal = {Journal of computational electronics},
volume = {17},
number = {4},
issn = {1572-8137},
address = {Dordrecht},
publisher = {Springer Science + Business Media B.V.},
reportid = {FZJ-2018-05182},
pages = {1457–1469},
year = {2018},
abstract = {We use ab initio molecular dynamics to generate realistic
a-Si:H/c-Si interface structures with very low defect-state
density by performing a high-temperature annealing.
Throughout the annealing, we monitor the evolution of the
structural and electronic properties. The analysis of the
bonds by means of the electron localization function reveals
that dangling bonds move toward the free a-Si:H surface,
leaving the interface region itself completely defect free.
The hydrogen follows this movement, which indicates that in
the case under consideration, hydrogen passivation does not
play a significant role at the interface. A configuration
with a satisfactory low density of defect states is reached
after annealing at 700 K. A detailed characterization of the
electronic states in this configuration in terms of their
energy, localization, and location reveals that, although no
dangling bond states can be found near the interface,
localized interface states do exist and are attributed to a
potential barrier at the interface. The quantitative
description of electronic localization also allows for the
determination of the a-Si:H mobility gap, which, together
with the c-Si band gap, yields band offsets that are in
qualitative agreement with experimental observations.},
cin = {IEK-5 / JARA-HPC},
ddc = {004},
cid = {I:(DE-Juel1)IEK-5-20101013 / $I:(DE-82)080012_20140620$},
pnm = {121 - Solar cells of the next generation (POF3-121) /
Ab-initio description of transport and recombination at
defective interfaces in solar cells $(jiek50_20141101)$},
pid = {G:(DE-HGF)POF3-121 / $G:(DE-Juel1)jiek50_20141101$},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000456674800007},
doi = {10.1007/s10825-018-1238-1},
url = {https://juser.fz-juelich.de/record/851557},
}