Comments on “20.8% PERC Solar Cell on 156 mm × 156 mm p-Type Multicrystalline Silicon Substrate”

In the commented paper, the optical path length factor
$Z_{{0}}$
is evaluated in a high-performance Si solar cell by using a reported procedure, which requires a previous determination of the slope
$1/ W_{{\rm{IQE}}}$
and the
y
-intercept
$1{\rm{/}}{\eta ^\prime_c}$
of the linear fit to inverse internal quantum efficiency 1/IQE versus absorption depth 1/α, where α is the absorption coefficient. The authors of the commented paper calculate values of
$W_{{\rm {IQE}}}$
and
${\eta ^\prime_c}$
that are inconsistent with their data and graphs. In this comment, self-consistent values of
$W_{{\rm{IQE}}}$
and
${\eta ^\prime_c}$
are derived that are congruent with the data.