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Stretchable OFET Memories: Tuning the Morphology and the Charge-Trapping Ability of Conjugated Block Copolymers through Soft Segment Branching

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Title: Stretchable OFET Memories: Tuning the Morphology and the Charge-Trapping Ability of Conjugated Block Copolymers through Soft Segment Branching
Authors: Hsu, Li-Che Browse this author
Isono, Takuya Browse this author
Lin, Yan-Cheng Browse this author
Kobayashi, Saburo Browse this author
Chiang, Yun-Chi Browse this author
Jiang, Dai-Hua Browse this author
Hung, Chih-Chien Browse this author
Ercan, Ender Browse this author
Yang, Wei-Chen Browse this author
Hsieh, Hui-Ching Browse this author
Tajima, Kenji Browse this author →KAKEN DB
Satoh, Toshifumi Browse this author →KAKEN DB
Chen, Wen-Chang Browse this author
Keywords: organic field-effect transistors
block copolymers
stretchable memory device
Issue Date: 20-Jan-2021
Publisher: American Chemical Society
Journal Title: ACS applied materials & interfaces
Volume: 13
Issue: 2
Start Page: 2932
End Page: 2943
Publisher DOI: 10.1021/acsami.0c18820
Abstract: 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(delta-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.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 敏文

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