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@ARTICLE{Almora:890999,
author = {Almora, Osbel and Cabrera, Carlos I. and Garcia-Cerrillo,
Jose and Kirchartz, Thomas and Rau, Uwe and Brabec,
Christoph J.},
title = {{Q}uantifying the {A}bsorption {O}nset in the {Q}uantum
{E}fficiency of {E}merging {P}hotovoltaic {D}evices},
journal = {Advanced energy materials},
volume = {11},
number = {16},
issn = {1614-6840},
address = {Weinheim},
publisher = {Wiley-VCH},
reportid = {FZJ-2021-01306},
pages = {2100022},
year = {2021},
abstract = {The external quantum efficiency (EQE), also known as
incident‐photon‐to‐collected‐electron spectra are
typically used to access the energy dependent photocurrent
losses for photovoltaic devices. The integral over the EQE
spectrum results in the theoretical short‐circuit current
under a given incident illumination spectrum. Additionally,
one can also estimate the photovoltaic bandgap energy (Eg)
from the inflection point in the absorption threshold
region. The latter has recently been implemented in the
“Emerging PV reports,” where the highest power
conversion efficiencies are listed for different application
categories, as a function of Eg. Furthermore, the device
performance is put into perspective thereby relating it to
the corresponding theoretical limit in the
Shockley–Queisser (SQ) model. Here, the evaluation of the
EQE spectrum through the sigmoid function is discussed and
proven to effectively report the Eg value and the sigmoid
wavelength range λs, which quantifies the steepness of the
absorption onset. It is also shown how EQE spectra with
large λs indicate significant photovoltage losses and
present the corresponding implications on the photocurrent
SQ model. Similarly, the difference between the photovoltaic
and optical bandgap is analyzed in terms of λs.},
cin = {IEK-11 / IEK-5},
ddc = {050},
cid = {I:(DE-Juel1)IEK-11-20140314 / I:(DE-Juel1)IEK-5-20101013},
pnm = {121 - Photovoltaik und Windenergie (POF4-121)},
pid = {G:(DE-HGF)POF4-121},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000625673700001},
doi = {10.1002/aenm.202100022},
url = {https://juser.fz-juelich.de/record/890999},
}