Modified Schottky Contact (Pd/MoOx) Based Filter-Free Spectrum-Selective Self-Powered Photodetector

This letter presents a modified Schottky contact utilizing
$MoO_{x}/Pd$
with Colloidal CdSe Quantum Dots to achieve spectrum selective self-powered photodetector. The detector shows a narrow FWHM of
$67 nm$
(centered around
$392 nm$
) under the self-bias conditions. The detector also exhibits improved responsivity, EQE, and detectivity of
$11.8 mA/W$
, 3.73 %, and
$1.74\times 10^{10} Jones$
, respectively, at
$\sim 392 nm$
under self-bias conditions. The optical properties of the device are also assessed using the Transfer Matrix Method (TMM). The numerically obtained results are also in agreement with the obtained photoresponse (within ~1.6%). The spectrum selective behavior and detector’s high figures of merit make it suitable for filter-free imaging applications under self-bias.