Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 3, 2025
Abstract
Excellent
pyroelectric
performance
in
environmentally
friendly
lead‐free
ferroelectrics
is
highly
demanded
for
uncooled
infrared
detector.
However,
the
trade‐off
between
room
temperature
coefficient
(
p
)
and
depolarization
T
d
remains
a
major
challenge
of
their
device
applications.
Herein,
superior
13.8
×
10
−4
C
m
−2
K
−1
with
high
155
°C
achieved
quenched
BNT‐Fe/Mn‐NBT
sample.
Oxygen
vacancy
engineering
proposed
to
solve
constraint
BNT‐based
ceramics.
The
local
A/B
site
displacement
oxygen
vacancies
are
constructed
perovskite
structure
by
quenching
treatment,
resulting
larger
lattice
distortion
.
Meanwhile,
defect‐induced
inhomogeneous
random
field
compensates
ferroelectric
down‐shifts
free
energy
well,
maintaining
detector
made
from
high‐performance
generates
voltage
responsivity
5906
V
W
specific
detection
rate
1.8
8
cm
Hz
1/2
,
which
comparable
commercial
RD‐624
type
PZT‐based
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 3, 2025
Abstract
Excellent
pyroelectric
performance
in
environmentally
friendly
lead‐free
ferroelectrics
is
highly
demanded
for
uncooled
infrared
detector.
However,
the
trade‐off
between
room
temperature
coefficient
(
p
)
and
depolarization
T
d
remains
a
major
challenge
of
their
device
applications.
Herein,
superior
13.8
×
10
−4
C
m
−2
K
−1
with
high
155
°C
achieved
quenched
BNT‐Fe/Mn‐NBT
sample.
Oxygen
vacancy
engineering
proposed
to
solve
constraint
BNT‐based
ceramics.
The
local
A/B
site
displacement
oxygen
vacancies
are
constructed
perovskite
structure
by
quenching
treatment,
resulting
larger
lattice
distortion
.
Meanwhile,
defect‐induced
inhomogeneous
random
field
compensates
ferroelectric
down‐shifts
free
energy
well,
maintaining
detector
made
from
high‐performance
generates
voltage
responsivity
5906
V
W
specific
detection
rate
1.8
8
cm
Hz
1/2
,
which
comparable
commercial
RD‐624
type
PZT‐based
