S1 Supporting Information Control of Concentration of NonHydrogenBonded Hydroxyl Groups in Polymer Dielectrics for Organic FieldEffect Transistors with Operational Stability Hyunjin Park, † , ‡ Jimin Kwon, † , ¶ Boseok Kang, § Woojo Kim, ¶ YunHi Kim, ⊥ Kilwon Cho, § and Sungjune Jung *, ¶ ‡ Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), 77 CheongamRo, NamGu, Pohang, Gyeongbuk, 37673, Republic of Korea ¶ Department of Creative IT Engineering, Pohang University of Science and Technology (POSTECH), 77 CheongamRo, NamGu, Pohang, Gyeongbuk, 37673, Republic of Korea § Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), 77 CheongamRo, NamGu, Pohang, Gyeongbuk, 37673, Republic of Korea