
Nature Communications, Год журнала: 2021, Номер 12(1)
Опубликована: Сен. 22, 2021
Abstract
Perovskite
photovoltaics
advance
rapidly,
but
questions
remain
regarding
point
defects:
while
experiments
have
detected
the
presence
of
electrically
active
defects
no
experimentally
confirmed
microscopic
identifications
been
reported.
Here
we
identify
lead
monovacancy
(V
Pb
)
in
MAPbI
3
(MA
=
CH
NH
+
using
positron
annihilation
lifetime
spectroscopy
with
aid
density
functional
theory.
Experiments
on
thin
film
and
single
crystal
samples
all
exhibited
dominant
trapping
to
vacancy
defects,
a
minimum
defect
~3
×
10
15
cm
−3
was
determined.
There
also
evidence
at
complex
$$({{{{{\rm{V}}}}}}_{{{{{\rm{Pb}}}}}}{{{{{\rm{V}}}}}}_{{{{{\rm{I}}}}}})^{-}$$
Язык: Английский