At NINGBO INNO PHARMCHEM CO.,LTD., we are driven by the pursuit of peak performance in organic electronic devices. Central to this mission is the development of organic field-effect transistors (OFETs) with exceptionally high charge carrier mobility. Our focus on TIPS-pentacene, a highly promising organic semiconductor, highlights the critical role of precise deposition techniques, particularly spin-coating, in achieving this goal.

TIPS-pentacene, when blended with insulating polymers like polystyrene (PS), offers a soluble and processable platform for creating thin films. However, the performance of these films, especially their charge transport characteristics, is heavily dependent on their morphological and crystalline structure. The spin-coating process provides a powerful lever to control these aspects. Our investigations into the effect of spin coating time on TIPS-pentacene morphology have revealed a direct correlation between spin time, residual solvent, and the resulting crystal growth of TIPS-pentacene.

Specifically, we observe that shorter spin times, which leave more residual solvent, tend to promote one-dimensional (1D) crystal growth. While these structures exhibit strong molecular stacking, the presence of significant gaps between crystals can hinder efficient charge transport. Conversely, by optimizing the spin-coating time, we can achieve a state with an ideal amount of residual solvent, leading to two-dimensional (2D) crystal growth. These 2D spherulites, characterized by larger grain sizes and a more continuous film structure, offer superior pathways for charge carriers, thereby significantly improving OFET mobility with TIPS-pentacene. This transition to 2D crystals is key to unlocking the material's full potential.

The ability to control the morphology and crystallinity through spin-coating is fundamental to fabricating high-performance OFETs. The enhanced charge transport in films with optimal 2D crystal growth of TIPS-pentacene translates directly into higher mobility values. NINGBO INNO PHARMCHEM CO.,LTD. leverages this understanding to develop advanced materials and processes that lead to superior TIPS-pentacene PS blend OFET performance. The goal is to provide the industry with solutions that enable more powerful and versatile organic electronic applications.

Our ongoing research at NINGBO INNO PHARMCHEM CO.,LTD. continues to explore the intricate relationships between processing parameters and material properties, aiming to further enhance the mobility and reliability of OFETs fabricated with TIPS-pentacene blends.