2-Aminoanthracene Crystallization in Its Compatible Polystyrene Block: RAFT Synthesis and Enhanced Charge Retention in Pentacene Transistor Gate Dielectrics

Journal Article · Thu Oct 19 00:00:00 EDT 2023 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.3c01130· OSTI ID:2205592

Chi, Chen ^[1]; Song, Yuqi ^[1]; Lee, Taein ^[1]; Reich, Daniel H.  ^[1]; Bragg, Arthur E.  ^[1]; Katz, Howard E.  ^[1]

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1. Johns Hopkins University, Baltimore, MD (United States)

We synthesized polystyrene-block-polyanthrylaminomethylstyrene (PS-b-PAAS) via RAFT reaction and side chain modification where the PAAS block is 50%. By blending 2-aminoanthracene (2AA) with PS-b-PAAS, the co-aggregation behavior of the PAAS block and 2AA within the thin film was observed by optical microscopy (OM) and x-ray diffraction. At 5 and 10 wt% of 2AA within the thin film, OM results showed a clear morphological difference between PS matrix and PS-b-PAAS matrix. Differences in the 2AA excited state lifetime in these matrices were also established using transient absorption spectroscopy (TAS). Blends were used as gate dielectrics in pentacene transistors. We compared characteristic voltage (Vc, an indicator of threshold voltage) before and after charging of PS-b-PAAS blended with unsubstituted PS and both polymers individually blended with 2AA. For blended PS-b-PAAS and PS, as the concentration of PS-b-PAAS increases, the decreased Vc especially with negative charging of the pentacene indicated a larger concentration of charge carriers induced by the dielectric film. The charging experiments also revealed that the unique structure formed by the 2AA/PS-b-PAAS blend significantly affected the charge storage capability of the organic field-effect transistors (OFET). Furthermore, this work demonstrates the novel co-aggregation structure in the dielectrics, and furthermore its impact on charge storage capability in pentacene OFETs.

• Research Organization: Johns Hopkins University, Baltimore, MD (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: FG02-07ER46465
• OSTI ID: 2205592
• Journal Information: Macromolecules, Vol. 56, Issue 21; ISSN 0024-9297
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Organic field-effect transistors
charge storage
capacitors
static charging
dielectrics
aromatic compounds
hydrocarbons
insulators
layers
polymers