Influence of Selenium on the Optoelectronic Properties of a Series of Structurally Simple p‐type Polymers for Organic Thin‐Film Transistors

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Tremendous efforts have been dedicated to improving the performance of organic thin-film transistors (OTFTs) through careful polymer design. Sulfur-containing polymers studied in-depth; however, their selenium-containing analogs remain rarer. Herein, a series low synthetic complexity with systematically increasing selenium content are presented. Three novel FO6-Se, FO6-BS-T, and FO6-BS-Se synthesized using facile two-step protocol, combining combinations selenophene, thiophene, benzothiadiazole (BT), benzoselenadiazole (BS) units. The optical, electrochemical, morphological properties these comprehensively analyzed, revealing interesting structure-property relationships. Results show significant bathochromic shift in absorption emission spectra upon Se content. Charge transport evaluated OTFTs, FO6-BS-T exhibiting highest hole mobility 0.038 cm2V-1s-1 when annealed at 100 °C. Grazing-incidence wide-angle X-ray scattering (GIWAXS) studies reveal reduced crystallinity BS incorporation density functional theory (DFT) calculations indicate increased backbone twisting inclusion compared BT. This work demonstrates how systematic alters properties, particularly frontier molecular levels, morphology, contributing understanding scalable for potential application transistors.

Language: Английский

Decoding the Structure of Benzodithiophene Polymers for High‐Efficiency Organic Solar Cells

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 20, 2025

Abstract The performance of organic electronic devices, such as solar cells, depends on understanding and controlling the solid‐state microstructure semiconducting polymers. In this study, a detailed aggregate states, microstructure, thermotropic behavior best‐performing family polymers for i.e., benzodithiophene‐based polymers, is provided. Using D18, PBnDT‐FTAZ, PBDB‐T‐Cl model systems, study reveals unique solid mesophase, distinct from previously observed polymer mesophases, comprising stacked solid‐like liquid‐like layers. This mesophase resembles sanidic structures while also sharing features with columnar mesophases like condis crystals paracrystals. At larger length scale, it organizes into nanoscale fibril‐like domains, backbones aligned along fibril axis, coexisting amorphous‐like glassy regions, reported here first time. Notably, high‐performance D18‐Cl, PM6 contain minimal regions. biphasic nanomorphology examined, providing insights how thermal annealing influences structure. Understanding these solid‐aggregate enables more precise framework defining structure–function relationships in will have significant impact entire field electronics, photovoltaics to bioelectronics wearable electronics.

Language: Английский