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TT: Fachverband Tiefe Temperaturen

TT 16: 2D Materials beyond graphene: Growth, structure and substrate interaction (joint session O/HL/TT)

TT 16.4: Talk

Monday, March 9, 2026, 15:45–16:00, HSZ/0204

Band-Like Transport and its Modulation by Nitrogen Doping in Transferable Semi-Conducting 2D-imine Covalent Organic Framework — •Vijay Bahadur Yadav, Diksha Srivastava, Satya Veer Singh, Itu Pandey, Manabendra Chandra, and Thiruvancheril G. Gopakumar — Indian Institute of Technology Kanpur

Two-dimensional (2D) imine-based covalent organic frameworks (COFs) are promising semiconductors for thin-film electronics and sensing due to their extended in-plane π-conjugation, enabling efficient charge transport. Here, we investigate two highly crystalline 2D imine COF films synthesised via quasi-equilibrium Schiff base condensation. By selecting molecular precursors, we tuned the nitrogen content, producing COFs with ten and six nitrogen atoms per unit cell (10N-COF and 6N-COF). The films are chemically stable in organic solvents and water, mechanically robust, and transferable onto various substrates, allowing fabrication over areas of tens of square centimeters. Electrical measurements using silver electrode arrays show linear current*voltage behaviour, indicating band-like transport, with consistent responses across multiple regions. The conductivity of 10N-COF is ~36 times higher than that of 6N-COF. Density functional theory calculations reveal similar band gaps but enhanced band dispersion near the Fermi level in 10N-COF, improving charge carrier mobility. Nitrogen incorporation thus effectively tunes charge transport in 2D COFs.

Keywords: Two Dimensional Molecular Materials; 2D-COF; Electronic Structure; Electrical Property; Crystalline Thin-Films