In this study, poly(2-ethylhexyl acrylate) (PEHA) homopolymer
and
its copolymer combined with acrylic acid P(EHA-
co
-AA) were employed as interfaces in two separate Schottky structures.
First, both interfaces were grown by initiated chemical vapor deposition
(iCVD), which provides much better deposition control and homogeneous
coating compared to solution-phase methods. In addition to this advantageous
method, the effects of two different polymers, one of which is better
able to adhere to the crystal surface on which it is formed than the
other, on the optoelectronic properties have been studied. Then, their
current–voltage (
I
–
V
) and capacitance/conductance–voltage (
C
/(
G
/ω)–
V
) characteristics were
investigated both in the dark and under illumination. The basic electrical
parameters and the illumination-induced profile of the surface state
(
N
ss
) were probed by
I
–
V
and
C
–
V
measurements for two samples. A decrease in the barrier
height (BH) and, consequently, a significant increase in the photocurrent
were observed under illumination. Striking changes in series resistance
(
R
s
) values are also highlighted. The
photocapacitance and conductance characteristics indicated that the
structures could be considered not only as photodiodes but also as
photocapacitors. Moreover, the voltage-dependent changes of some photodetector
parameters, such as responsivity (
R
), sensitivity
(
S
), and specific detectivity (
D
*), along with the transient photocurrent characteristics, are discussed
for both structures. Therefore, we can say that the strong changes
in these parameters, which figure the merit of photodiode and photodetector
applications, depending on the voltage and under illumination, prove
that it is a study carried out in accordance with the purpose and
so they can be used in electronic and optoelectronic applications.