1 research outputs found
Engineering Multifunctionality in MoSe<sub>2</sub> Nanostructures Via Strategic Mn Doping for Electrochemical Energy Storage and Photosensing
To
achieve advanced functionalities in nanostructured MoSe2 for enhanced electrochemical charge storage and improved
photosensing, here we propose an effective strategy, i.e., the substitutional
doping of the heteroatom Mn. We achieve a 313% increase in specific
capacitance for 6.2% of Mn doping compared to pristine MoSe2 at the scan rate of 5 mV/s in a three-electrode configuration. For
a two-electrode arrangement, also superior charge-storage performance
is noted. The enhanced electrode performance can be attributed to
the increase of electrical conductivity arising due to an increase
of electron density for the n-type nature of Mn doping realized via
an X-ray photoelectron spectroscopy study and density functional theory
calculation. The latter one also unveils that Mn doping introduces
catalytically active sites by disrupting homogeneous charge distribution
over the topology of the MoSe2 basal plane contributing
to better charge-storage performance. Mn doping-induced shift in the
Fermi level of MoSe2 toward the conduction band also minimizes
the contact barrier height signifying its improved capabilities for
a photosensor device. Additionally, Mn doping causes alleviation of
the charge-recombination process resulting in increase of photocarrier
separation. As a result, we observe a 187% enhancement in the photocurrent
and significantly higher responsivity and detectivity for 6.2% Mn-doped
MoSe2 than its pristine counterpart. Our proposed doping
strategy to modulate charge storage as well as photoresponse properties
demonstrates high potential for MoSe2 along with other
two-dimensional transition-metal dichalcogenides in developing next-generation
energy-storage and optoelectronic devices