Probing
the Correlation of Twin Boundaries
and Charge Transport of CdTe Solar Cells Using Electron Backscattering
Diffraction and Conductive Atomic Force Microscopy
Version 3 2018-07-17, 13:37
Version 2 2018-07-13, 16:25
Version 1 2018-07-13, 16:21
Posted on 2018-07-17 - 13:37
The
effect of grain boundaries (GBs) especially twin boundaries (TBs)
on the performance of polycrystalline CdTe thin film (1–2 μm
in thickness) solar cells remains largely controversial. Understanding
the GB’s microstructure and physical property and their impact
on the photovoltaic efficiency is critically important to the optimization
of the solar cell performance. In this work, we present a systematic
study of GBs in CdTe thin film solar cells of different efficiencies
in the range of 1.97–9.68%, aiming to elucidate a quantitative
correlation of GBs especially TBs with the solar cell charge transport
by integrating several advanced approaches including electron backscattering
diffraction, transmission electron microscopy, conductive atomic force
microscopy, and scanning Kelvin probe force microscopy. Importantly,
we have confirmed {111} Σ3 TBs form in the PLD CdTe solar cells
and are beneficial by providing an efficient channel for charge transport.
The percentage of {111} Σ3 TBs was found to be correlated quantitatively
with the solar cell power-conversion efficiency and a higher percentage
led to a higher efficiency. In addition, a built-in field was observed
between the random-angle GBs with respect to the grain interior, which
may enhance exciton dissociation. This study provides a critical insight
into the role of GBs in the polycrystalline CdTe thin film solar cells
and is important to further improvement of their performance.
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Li, Hui; Harrison, Paul; Wu, Judy; Yao, Huijun (2018). Probing
the Correlation of Twin Boundaries
and Charge Transport of CdTe Solar Cells Using Electron Backscattering
Diffraction and Conductive Atomic Force Microscopy. ACS Publications. Collection. https://doi.org/10.1021/acsaem.8b00382
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AUTHORS (4)
HL
Hui Li
PH
Paul Harrison
JW
Judy Wu
HY
Huijun Yao
KEYWORDS
electron backscattering diffractionphotovoltaic efficiencycell performanceTwin BoundariesΣ3cell charge transportConductive Atomic Force Microscopyexciton dissociationCharge Transportcell power-conversion efficiencyrandom-angle GBsgrain boundariesCdTe Solar Cellstransmission electron microscopyscanning Kelvin probe force microscopycharge transportfilmforce microscopyTBElectron Backscattering DiffractionPLD CdTe