https://scholars.lib.ntu.edu.tw/handle/123456789/576785
標題: | Stretchable OFET Memories: Tuning the Morphology and the Charge-Trapping Ability of Conjugated Block Copolymers through Soft Segment Branching | 作者: | Hsu, Li-Che Isono, T. Lin, Yan-Cheng Kobayashi, Saburo Chiang, Yun-Chi Jiang, Dai-Hua Hung, Chih-Chien Ercan, Ender Yang, Wei-Chen Hsieh, Hui-Ching Tajima, Kenji Satoh, Toshifumi WEN-CHANG CHEN |
關鍵字: | Atomic force microscopy; Block copolymers; Conjugated polymers; Crystallinity; Electrets; Hole traps; Morphology; Organic field effect transistors; Phase separation; Polymer films; Structural design; Conjugated block copolymers; Design flexibility; Device application; Device performance; Insulating polymer; Memory performance; Polymer architecture; Thin film morphology; Charge trapping | 公開日期: | 2021 | 卷: | 13 | 期: | 2 | 起(迄)頁: | 2932-2943 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | The mechanical properties and structural design flexibility of charge-trapping polymer electrets have led to their widespread use in organic field-effect transistor (OFET) memories. For example, in the electrets of polyfluorene-based conjugated/insulating block copolymers (BCPs), the confined fiberlike polyfluorene nanostructures in the insulating polymer matrix act as effective hole-trapping sites, leading to controllable memory performance through the design of BCPs. However, few studies have reported intrinsically stretchable charge-trapping materials and their memory device applications, and a practical method to correlate the thin-film morphology of BCP electrets with their charge-trapping ability has not yet been developed. In this study, a series of new conjugated/insulating BCPs, poly(9,9-di-n-hexyl-2,7-fluorene)-block-poly(δ-decanolactone)s (PF-b-PDLx, x = 1-3), as stretchable hole-trapping materials are reported. The linear and branched PDL blocks with comparable molecular weights were used to investigate the effect of polymer architecture on morphology and device performance. Moreover, the coverage area of the polyfluorene nanofibers on the BCP films was extracted from atomic force microscopy images, which can be correlated with the trapping density of the polymer electrets. The branched PDL segments not only improve stretchability but also tailor crystallinity and phase separation of the BCPs, thus increasing their charge-trapping ability. The OFET memory device with PF-b-PDL3 as the electret layer exhibited the largest memory window (102 V) and could retain its performance at up to 100% strain. This research highlights the importance of the BCP design for developing stretchable charge-trapping materials. ? 2021 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099960968&doi=10.1021%2facsami.0c18820&partnerID=40&md5=1e997a752cf4872427f925ff093eed06 https://scholars.lib.ntu.edu.tw/handle/123456789/576785 |
ISSN: | 19448244 | DOI: | 10.1021/acsami.0c18820 |
顯示於: | 化學工程學系 |
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