## 4 Conclusions and Outlook  
This study provides a detailed examination of the influence of PS with varying molecular weights on the crystallization morphology and charge transport properties of TIPS pentacene-based OTFTs. The results show that PS, as an amorphous polymer additive, plays a significant role in modulating the film morphology, which in turn impacts the device performance. Low-molecular-weight PS (less than 20k) enhances uniformity, reduces grain boundaries, and improves the interface quality, leading to better charge transport. Medium-molecular-weight PS (20k to 250k) balances film stability and crystallinity, resulting in moderate enhancements in both crystal size and charge carrier mobility. High-molecular-weight PS (greater than 250k) promotes larger crystalline domains and better long-range order, significantly boosting charge transport efficiency. High Mw PS presents specific challenges in organic electronic devices despite its benefits in enhancing long-range order and charge transport. One significant limitation is the increased likelihood of phase separation between PS and the organic semiconductor, which can disrupt the uniformity of the active layer. This phase separation can lead to uneven film morphology, and create isolated domains of the semiconductor and PS, which may restrict charge transport pathways. Additionally, high Mw PS often has lower solubility, making it more difficult to achieve a homogeneous solution during deposition. This can result in both uncontrolled film formation and poor electrical properties in organic electronic devices. Therefore, one of the major challenges in implementing high Mw PS is balancing the molecular weight to optimize both the stability and electrical performance, while carefully selecting solvent systems that ensure uniform film deposition. Therefore, utilizing high molecular weight PS in combination with advanced solvent engineering techniques offers great potential for enhancing crystallization and charge mobility in organic semiconductors. Despite the advancements made, several challenges remain. One of the critical challenges is gaining a deeper understanding of the molecular-level interactions between PS and TIPS pentacene. Future research should focus on using advanced characterization techniques, such as in situ AFM and time-resolved X-ray diffraction (XRD), to better understand how PS affects the crystallization process at the molecular scale. Moreover, solvent engineering is an essential yet underexplored area. Optimizing the solvent system to precisely control the crystallization kinetics can further improve film morphology and stability. Solvent effects, particularly in combination with different molecular weights of PS, need to be studied more thoroughly to fine-tune crystallization for optimized device performance. There is also potential in exploring the synergistic effects of combining multiple polymer additives. By blending different types of polymers with PS, it may be possible to develop novel film morphologies that lead to even greater improvements in charge transport and device stability. Advanced deposition techniques such as blade coating, slot-die coating, and meniscus-guided coating offer additional avenues for controlling crystallization more precisely and should be explored further. Also, understanding the long-term stability of PS-blended TIPS pentacene films remains crucial for practical applications in organic electronics. The thermal and mechanical stability of these films under different environmental conditions should be a key focus for future studies. Finally, the integration of traditional and 3D printing techniques equipped with AI-driven decision-making can automate significant portions of the experimental process. For instance, inkjet printing and meniscus-guided coating have shown promise in creating uniform organic semiconductor films.