Design and development of dithienopyrrolobenzothiadiazole‐isoindigo based conjugated polymers and their hole mobilities

• Published in: Journal of applied polymer science Vol. 141; no. 27
• Main Authors: Shah, Krisha, Kapdi, Yash G., Soni, Saurabh S., Zade, Sanjio S., Patel, Arun L.
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 15-07-2024; Wiley Subscription Services, Inc
• Subjects: dithienopyrrolobenzothiadiazole (DTPBT); donor‐acceptor conjugated polymers; Energy levels; Gel chromatography; Infrared analysis; isoindigo; knoevenagal coupling reaction; Molecular orbitals; NMR; Nuclear magnetic resonance; Polymers; Space charge; Synthesis; Thermal stability; Thermogravimetric analysis
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.55609

π‐Extended dithienopyrrolobenzothiadiazole‐isoindigo‐based conjugated polymers were synthesized and well characterized by using various analysis techniques like infrared (IR), 1H NMR, UV–Visible spectroscopy, thermogravimetric analysis, cyclic voltammetry analysis, and gel permeation chromatography. The bandgap of synthesized polymers, P‐1, P‐2, and P‐3, were determined to be 1.95, 1.91, and 1.93 eV, respectively. These polymers exhibited robust thermal stability up to 290°C. The highest occupied molecular orbital energy levels were below −5.0 eV for all polymers, while the lowest unoccupied molecular orbital energy levels ranged from −3.5 to −3.3 eV. The measured space charge limited current hole mobilities for polymers, P‐1, P‐2, and P‐3, were 1.02 ± 0.47 × 10−1, 1.17 ± 0.47 × 10−1, and 2.51 ± 0 0.47 × 10−2 cm2 V−1 s−1, respectively.
Π‐Extended dithienopyrrolobenzothiadiazole‐isoindigo‐based conjugated polymers and their high hole mobilities