Yu, Ilhwan Jo, Yerin Ko, Jaehyoung Kim, Dae-Yoon Sohn, Daewon Joo, Yongho 2024-01-19T17:03:22Z 2024-01-19T17:03:22Z 2021-09-04 2020-07-08 1530-6984 https://pubs.kist.re.kr/handle/201004/118393 Charge neutral, nonconjugated organic radicals have emerged as extremely useful active materials for solid-state electronic applications. This previous achievement confirmed the potential of radical-based macromolecules in organic electronic devices; however, charge transport in radical molecules has not been studied in great detail from a fundamental perspective. Here we demonstrate the charge transport in a nonconjugated organic small radical, 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (h-TEMPO). The chemical component of this radical molecule allows us to form a single crystal via physical vapor deposition (PVD). While the charge transport of this macroscopic open-shell single crystal is rather low, thermal annealing of the well-defined single crystal enables the molecule to have a rapid charge transfer reaction due to the electronic communication of open-shell sites with each other, which results in electrical conductivities greater than 0.05 S m(-1). This effort demonstrates a drastically different model than the commonly accepted conjugated polymers or molecules for the creation of next-generation conductors. English AMER CHEMICAL SOC PHYSICAL VAPOR GROWTH FIELD-EFFECT-TRANSISTOR CHARGE-TRANSPORT THIN-FILM SEMICONDUCTORS POLYMER ORGANIZATION PERFORMANCE NONVOLATILE CRYSTALS Making Nonconjugated Small-Molecule Organic Radicals Conduct Article 10.1021/acs.nanolett.0c01730 1 NANO LETTERS, v.20, no.7, pp.5376 - 5382 NANO LETTERS 20 7 5376 5382 scie scopus 000548893200089 2-s2.0-85088208983 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article PHYSICAL VAPOR GROWTH FIELD-EFFECT-TRANSISTOR CHARGE-TRANSPORT THIN-FILM SEMICONDUCTORS POLYMER ORGANIZATION PERFORMANCE NONVOLATILE CRYSTALS Nonconjugated conductor stable radical small-molecule conductor Single-crystal