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Author: search.filters.author.Nabat, Karim YoussefStart date: 2025

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    Tuning the Optoelectronic Properties of Perylene Diimide for Advanced Organic Photovoltaic
    (2026-02-01)
    Ayub, Ali Raza
    ;
    Sabir, Muhammad Zohaib
    ;
    Salba
    ;
    Yaqoob, Umer
    ;
    Nabat, Karim Youssef
    Organic solar cells (OSCs) are becoming more popular because they are cheap to make, flexible, and have a higher power conversion efficiency (PCE), which has gone up from 4.1% in 2010–25.21% in 2022. However, making the active layer materials’ electrical characteristics better is still a big problem when it comes to getting even more efficient. This research seeks to tackle this problem by creating and synthesizing a group of small molecules (PDI-1 to PDI-6) using a perylene diimide indacenodithiophene (PIDT) acceptor structure and adding different donor–acceptor connectors to improve charge transfer and light absorption.We tested their photovoltaic performance and compared it to that of a reference molecule (PDI-R). All synthesized molecules exhibit low bandgaps, higher dipole moments, and improved electron transfer properties. Among them, PDI-4, a donor–acceptor–donor (D–A–D) structured molecule with a thiophene bridge, demonstrated the best overall performance, showing enhanced π-delocalization and charge–transfer efficiency. These findings contribute to the broader goal of advancing the molecular design of active-layer materials for high-performance OSCs.
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    Investigating the optoelectronic properties of Perylene Diimide-based organic molecules for high-efficiency organic solar cells
    (2025-11-01)
    Ayub, Ali Raza
    ;
    Sabir, Muhammad Zohaib
    ;
    Salba
    ;
    Yaqoob, Umer
    ;
    Nabat, Karim Youssef
    Organic solar cells (OSCs) have garnered significant focus recently due to their highly efficient, low-cost manufacturing and capacity for energy conversion. Reports indicate a remarkable increase in OSC efficiency, rising from 4.1 % in 2010 to 25.21 % in 2022. However, the lack of suitable substances for hole transport remains a critical challenge in enhancing efficiency. In this context, a series of small molecules designated PDIM1, PDIM2, PDIM3, PDIM4, PDIM5, PDIM6, and PDIM7 have been developed, which serve as organic molecules. These molecules are based on PIDT donor structures incorporating acceptors directly at the center or with bridging units. The photovoltaic and optoelectronic properties of the molecules have been compared with the reference PDIR. All organic molecules exhibited lower energy gaps than the reference, enhanced electron density transfer, and high dipole moments. These findings facilitate the understanding of organic molecules' design methodologies for optimizing the electronic properties. This study establishes the potential for manufacturing high-efficiency OSCs using the PDIM4 molecules. The synthetic fabrication of these novel-designed molecules is required for researchers to advance PDI-based OSCs.