Improving CdSeTe Devices With a Back Buffer Layer of $\text{Cu}_\text{x}$ $\text{AlO}_\text{y}$
2021
The open-circuit voltage (V
$_\text{oc}$
) of CdTe-based photovoltaics may be limited by carrier recombination at interfaces (front or back) or in the absorber layer. Reduction in recombination of a given dominant mechanisms can lead to improved device performance if the remaining mechanisms turn on in a narrow bias range just below the open circuit voltage. In this article, we demonstrate enhanced performance by incorporating solution-processed Cu
$_\text{x}$
AlO
$_\text{y}$ to form a back-buffer layer in CdSe/CdTe devices. Outstanding minority carrier lifetimes of 656 and 4.2 ns were measured with glass side and film side illumination for device stacks processed with Cu
$_\text{x}$
AlO
$_\text{y}$
. Devices demonstrated efficiencies of up to 17.4% with V
$_\text{oc}$ of 859 mV, FF of 75.6% and J
$_\text{sc}$ of 26.9 mAcm−2 while the efficiency of the reference device without the back-buffer layer was 16.5% with V
$_\text{oc}$ of 839 mV, FF of 70.6%, and J
$_\text{sc}$ of 27.9 mAcm−2.
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