Papers by Muhammad Umair Ali
We discovered that an alcohol soluble non-fullerene small molecule perylene diimides derivative (... more We discovered that an alcohol soluble non-fullerene small molecule perylene diimides derivative (PDIN), which is a traditional cathode interface material, can be used as a promising electron transporting material for efficient p-i-n perovskite solar cells. Surprisingly, by using 2,2,2-Trifluoroethanol as solvent for PDIN, it can easily form high quality PDIN thin film onto the perovskite layer and overcome the erosion problem of conventional alcohol solvents such as methanol and ethanol etc. In addition, PDIN can efficiently quench the photoluminescence of perovskite layer and extract electrons from perovskite layer. Finally, a power conversion efficiency of 15.28% is achieved from the device with PDIN as electron transporting layer, which is significantly higher than the PC61BM only device. Further, we also found that the performance of the device with PDIN as electron transporting layer is not sensitive to the PDIN's thickness. These results indicate that PDIN is a promising electron transporting material for efficient p-i-n perovskite solar cells.
In this work, the effect of a new nanocomposite material on the photodegradation of methylene blu... more In this work, the effect of a new nanocomposite material on the photodegradation of methylene blue is demonstrated. The nanocomposite is synthesized by the combination of cupric oxide (CuO) with graphene nanoplatelets (GNPs) and characterized by XRD, FE-SEM, FTIR, Raman, and UV-Vis spectroscopy. Interestingly, the inclusion of GNPs with CuO enhances the photocatalytic properties of nanocomposite without tweaking inherent properties such as the conductive nature of GNPs. Within 80 minutes of exposure to the solar light, a 99.44% photodegradation of methylene blue is achieved, which is much better than using CuO alone, for which the degradation was only 75%. The much-improved photocatalytic performance of the nanocomposite is a consequence of the electrically conductive nature of GNPs as well as the low bandgap energy of GCuO, that causes fast photo excitation of electrons and lengthens the recombination lifetime of charge carriers.
ZnxCu1−xO (where x= 0, 0.01, 0.03, 0.05, 0.07 and 0.1 mol%) hierarchical nanostructures have been... more ZnxCu1−xO (where x= 0, 0.01, 0.03, 0.05, 0.07 and 0.1 mol%) hierarchical nanostructures have been prepared via soft chemical route. X-ray diffaction (XRD) results of
the synthesized samples reveal the monoclinic structure of CuO without any impurity
related phases. The micro-structural parameters such as crystallite size and microstrain have been strongly inflenced by Zn doping. Scanning electron microscope
(SEM) analyses depict the formation of hierarchical nanostructures having average
particle size in the range of 26-43 nm. The surface area of CuO nanostructures
has been reduced systematically with the increase in Zn content which is linked
with the variations in particle size. An obvious decrease in the optical band gap
energy of the synthesized CuO hierarchical nanostructures has been observed with
Zn doping which is assigned to the formation of shallow levels in the band gap of
CuO and combined transition from oxygen 2p states to d sates of Cu and Zn ions.
The bactericidal potency of the CuO hierarchical nanostructures have been found
to be enhanced remarkably with Zn doping.
Conference Presentations by Muhammad Umair Ali
Poster Presentation
Undoped and Fe doped SnO2 nanostructures have been prepared using quick wet chemical route at amb... more Undoped and Fe doped SnO2 nanostructures have been prepared using quick wet chemical route at ambient temperature. The morphological investigations using (SEM) have shown that the nanostructures are in the grain size range of 89-114 nm. The crystal structure and phase purity of Fe doped nanostructures have been analyzed by XRD. The synthesized nanostructures demonstrate single phase SnO2 tetragonal rutile structure. The Fourier Transformation Infrared (FTIR) spectroscopy shows the bonding between the atoms. The prepared SnO2 nanostructures exhibit diamagnetism, while the doping of Fe into SnO2 matrix leads towards the room temperature ferromagnetism (RTFM). The doped samples with RTFM have potential applications in modern spintronics devices .
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Papers by Muhammad Umair Ali
the synthesized samples reveal the monoclinic structure of CuO without any impurity
related phases. The micro-structural parameters such as crystallite size and microstrain have been strongly inflenced by Zn doping. Scanning electron microscope
(SEM) analyses depict the formation of hierarchical nanostructures having average
particle size in the range of 26-43 nm. The surface area of CuO nanostructures
has been reduced systematically with the increase in Zn content which is linked
with the variations in particle size. An obvious decrease in the optical band gap
energy of the synthesized CuO hierarchical nanostructures has been observed with
Zn doping which is assigned to the formation of shallow levels in the band gap of
CuO and combined transition from oxygen 2p states to d sates of Cu and Zn ions.
The bactericidal potency of the CuO hierarchical nanostructures have been found
to be enhanced remarkably with Zn doping.
Conference Presentations by Muhammad Umair Ali
the synthesized samples reveal the monoclinic structure of CuO without any impurity
related phases. The micro-structural parameters such as crystallite size and microstrain have been strongly inflenced by Zn doping. Scanning electron microscope
(SEM) analyses depict the formation of hierarchical nanostructures having average
particle size in the range of 26-43 nm. The surface area of CuO nanostructures
has been reduced systematically with the increase in Zn content which is linked
with the variations in particle size. An obvious decrease in the optical band gap
energy of the synthesized CuO hierarchical nanostructures has been observed with
Zn doping which is assigned to the formation of shallow levels in the band gap of
CuO and combined transition from oxygen 2p states to d sates of Cu and Zn ions.
The bactericidal potency of the CuO hierarchical nanostructures have been found
to be enhanced remarkably with Zn doping.