Inorganic Polymer Micropillar‐Based Solution Shearing of Large‐Area Organic Semiconductor Thin Films with Pillar‐Size‐Dependent Crystal Size |
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Authors: | Jin‐Oh Kim Jeong‐Chan Lee Min‐Ji Kim Hyunwoo Noh Hye‐In Yeom Jong Beom Ko Tae Hoon Lee Sang‐Hee Ko Park Dong‐Pyo Kim Steve Park |
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Affiliation: | 1. Organic and Nano Electronics Laboratory, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yuseong‐gu, Daejeon, Republic of Korea;2. Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea;3. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Yuseong‐gu, Daejeon, Republic of Korea;4. Department of Electrical Engineering, Kwangwoon University, Nowon‐gu, Seoul, Republic of Korea;5. Center for Intelligent Microprocess of Pharmaceutical Synthesis (CIMPS), Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea |
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Abstract: | It is demonstrated that the crystal size of small‐molecule organic semiconductors can be controlled during solution shearing by tuning the shape and dimensions of the micropillars on the blade. Increasing the size and spacing of the rectangular pillars increases the crystal size, resulting in higher thin‐film mobility. This phenomenon is attributed as the microstructure changing the degree and density of the meniscus line curvature, thereby controlling the nucleation process. The use of allylhybridpolycarbosilane (AHPCS), an inorganic polymer, is also demonstrated as the microstructured blade for solution shearing, which has high resistance to organic solvents, can easily be microstructured via molding, and is flexible and durable. Finally, it is shown that solution shearing can be performed on a curved surface using a curved blade. These demonstrations bring solution shearing closer to industrial applications and expand its applicability to various printed flexible electronics. |
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Keywords: | inorganic polymers microstructuring soft lithography solution shearing TIPS‐pentacene |
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