Title: Charge Trapping in Polymer Electrets with Highly Dilute Blended Arylamine Donors

Abstract

The nature of and ability to control biasing across dielectrics is a key area of research for the design of more versatile organic field-effect transistors (OFETs). One important technique to achieve such control is the inclusion of donor or acceptor molecules in the dielectric to modulate charge trapping therein. Here in this work, we report the effects of the additive concentration on OFETs with two different arylamines blended in polystyrene (PS) dielectrics, N,N'-diphenyl-N,N'-di-p-tolylbenzene-1,4-diamine (MPDA) and 4-anilinotriphenylamine (PATPA), as well as a comparison between PATPA/PS blends and dielectrics where PATPA was chemically tethered to the PS matrix. Dielectrics included in OFETs were subject to charging, and their charging capacity and stability were extracted from the OFET threshold voltages. For both MPDA/PS and PATPA/PS, blends with additive mole fractions as low as χ = 3 × 10^–4 were sufficient to cause increases in the charge trapping relative to pure PS dielectrics. We observed a pronounced inverse relationship between the capacity and stability of blended systems at larger mole fractions (χ = 10^–2) where the interadditive molecule distances became comparable to their size (~1 nm). Differences between MPDA and PATPA behaviors were consistent with their different structures and sizes. Furthermore, we found amore » small effect on electronic trapping arising from the chemical tethering of PATPA to the PS matrix. This result was consistent with the changes made to the additive during the tethering process and small compared to the observed differences arising from the concentration. These results suggest that the average intermolecular separation is a key determinant of charge storage stability in blended dielectrics.« less

Authors:

Plunkett, Evan C. ^[1]; Zhang, Qingyang ^[1]; Katz, Howard E.  ^[1];

• Search DOE PAGES for author "Katz, Howard E."
• Search DOE PAGES for ORCID "0000-0002-3190-2475"

Reich, Daniel H.  ^[1]

• Search DOE PAGES for author "Reich, Daniel H."
• Search DOE PAGES for ORCID "0000-0001-6313-9884"

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+ Show Author Affiliations

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

Publication Date:

Thu Apr 08 00:00:00 EDT 2021

Research Org.:

Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

OSTI Identifier:

1774806

Grant/Contract Number:  

FG02-07ER46465

Resource Type:

Accepted Manuscript

Journal Name:

ACS Applied Electronic Materials

Additional Journal Information:

Journal Volume: 3; Journal Issue: 4; Journal ID: ISSN 2637-6113

Publisher:

ACS Publications

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; polymer blends; phenylene diamines; threshold voltage shift; field-effect transistors; dielectric charge trapping