Department of Physics
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Item Fabrication of Metal Oxide Based Charge Transport Layer for Energy Conversion Devices(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Kainat Ishtiaq; CIIT/SP24-RPH-011/LHR; Dr. Ishrat Sultana; LHR TP 10123Energy conversion devices such as perovskite solar cells, dye-sensitized solar cells, and electrochemical energy storage systems have gained significant attention due to their potential to provide efficient, low-cost, and sustainable alternatives to conventional energy technologies. A critical factor influencing the performance of these devices is the charge transport layer, which governs charge extraction, transport, and recombination processes at the interfaces. In this study, nickel oxide (NiO) and zinc oxide (ZnO) were synthesized and investigated as hole transport and electron transport materials, respectively, along with their LC sheet–based composite counterparts, for application in energy conversion and storage devices. NiO and ZnO nanoparticles were successfully synthesized using a simple and cost-effective coprecipitation method, while LC sheet–based composites were developed using corn fiber as a sustainable carbon source to enhance electrical conductivity and interfacial contact. The structural, electrochemical, and vibrational properties of the prepared materials were systematically characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Raman spectroscopy. CV analysis revealed that pristine NiO and ZnO exhibited pseudocapacitive behavior due to reversible redox reactions, whereas LC sheet–based composites showed predominantly capacitive behavior with improved rate capability, reversibility, and charge–discharge performance. The enhanced electrochemical performance of the composites is attributed to the conductive carbon network provided by the LC sheet, which facilitates rapid electron transport and efficient ion diffusion.Item Synthesis and Characterization of Nickel doped Zinc Oxide Based Paper Electrode for Dye- Sensitized Solar Cells(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Maria Ejaz; CIIT/SP23-RPH-027/LHR; Dr. Ishrat Sultana; LHR TP 9644Flexible dye-sensitized solar cells (DSSCs) are a desirable alternative to rigid glass substrate-based solar cells because of the potential for flexibility and light weight. Researchers and scientists have been fascinated by polymer based electrodes due to its durability and flexibility. However, the production of polymers requires the use of hazardous chemicals. As a result, the tendency has shifted toward material synthesis methods that are safer, more affordable, and more sustainable. A flexible working electrode composite based on nickel (Ni) doped zinc oxide (ZnO) is synthesized in this project, by adding lignocellulose (LC) fibers. It is an effort to expand the potential of flexible electrodes based on metal oxide for DSSC applications. The co-precipitation process is used to create a transition metal-doped nanostructure (Ni doped ZnO). Doped particles with regulated composition, size, and homogeneity can be easily prepared at room temperature using this synthesis method. As a result, this work uses natural fibers to give Ni- doped ZnO a compact and porous structure for energy conversion applications. More sunlight will be absorbed as a result of the increased porosity, increasing the DSSC cell’s efficiency.