Speaker
Description
Organic field-effect transistors (OFETs) are attracting significant attention for applications in flexible electronics, wearable devices, sensors, and low-cost printed circuits. Achieving high electrical performance in these devices depends strongly on the morphology and molecular ordering of the organic semiconductor layer. In this work, we investigate the influence of solution-processing conditions on the morphology, crystallinity, and electrical performance of a diketopyrrolopyrrole (DPP)-based small-molecule semiconductor, DBT-I. Thin films were fabricated using spin coating and solution shearing, and the effects of solvent selection and thermal annealing were systematically studied. The films were characterized using polarized optical microscopy (POM), atomic force microscopy (AFM), and grazing-incidence wide-angle X-ray scattering (GIWAXS) to establish the relationship between film microstructure and charge transport. Solution-sheared films exhibited improved molecular alignment, enhanced
crystallinity, and larger crystalline domains, resulting in significantly better device performance than spin-coated films. A maximum field-effect mobility of 0.26 cm2 V−1 s−1 and an on/off current ratio of approximately 106 were achieved under optimized processing
conditions. These results demonstrate that careful control of solution-processing parameters is an effective strategy for improving charge transport in organic semiconductors. With the growing interest in scalable manufacturing, printed electronics, and flexible sensing
technologies, understanding the relationship between processing, film structure, and device performance has become increasingly important. The findings of this work provide valuable insights for the design of high-performance solution-processed OFETs and support the development of next-generation flexible and wearable electronic devices.
References:
1. R. Raveendran et al., ACS Appl. Electron. Mater. 2025, 7 (15), 6874–6884.