Bridging Molecular Design and Device Performance: Nitrogen Containing π-Conjugated Semiconductors for Application in Organic Electronics

Bezboruah, Jasmine (2026) Bridging Molecular Design and Device Performance: Nitrogen Containing π-Conjugated Semiconductors for Application in Organic Electronics. PhD thesis, Indian Institute of Science Education and Research Kolkata.

Text (PhD thesis of Jasmine Bezboruah (21RS030)) 21RS030.pdf - Submitted Version Restricted to Repository staff only Download (11MB)

Abstract

The development of stable and high-performance organic semiconductors is a major research challenge in the advancement of next-generation organic electronic devices. In this context, this thesis presents the design and synthesis of nitrogen-containing π-conjugated small molecule semiconductors for applications in organic electronic devices. Sulfur atoms were incorporated into the conjugated framework to tune the optical, electrical, and mechanical properties. The introduction of linear and branched alkyl chains improved the solubility and solution processability of the materials. Detailed structure property correlation studies, including crystal structure analysis, OFET performance, and mechanical property investigation revealed the significant role of multiple heteroatom incorporation in governing molecular packing and charge transport behavior. Further, chemical doping strategies were employed to enhance the charge transfer characteristics. In addition, a series of nitrogen containing NDI-based molecules with exceptionally low lying LUMO energy levels were reported, demonstrating their potential as efficient air stable n-type semiconductors for practical OFET applications. Overall, this thesis highlights the synergistic integration of synthesis, molecular engineering, and crystal engineering toward the development of high-performance organic semiconducting materials.

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