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High-mobility, trap-free charge transport in conjugated polymer diodes

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Title: High-mobility, trap-free charge transport in conjugated polymer diodes
Authors: Nikolka, M
Broch, K
Armitage, J
Hanifi, D
Nowack, PJ
Venkateshvaran, D
Sadhanala, A
Saska, J
Mascal, M
Jung, S-H
Lee, J-K
McCulloch, I
Salleo, A
Sirringhaus, H
Item Type: Journal Article
Abstract: Charge transport in conjugated polymer semiconductors has traditionally been thought to be limited to a low-mobility regime by pronounced energetic disorder. Much progress has recently been made in advancing carrier mobilities in field-effect transistors through developing low-disorder conjugated polymers. However, in diodes these polymers have to date not shown much improved mobilities, presumably reflecting the fact that in diodes lower carrier concentrations are available to fill up residual tail states in the density of states. Here, we show that the bulk charge transport in low-disorder polymers is limited by water-induced trap states and that their concentration can be dramatically reduced through incorporating small molecular additives into the polymer film. Upon incorporation of the additives we achieve space-charge limited current characteristics that resemble molecular single crystals such as rubrene with high, trap-free SCLC mobilities up to 0.2 cm2/Vs and a width of the residual tail state distribution comparable to kBT.
Issue Date: 9-May-2019
Date of Acceptance: 2-Apr-2019
URI: http://hdl.handle.net/10044/1/70135
DOI: https://dx.doi.org/10.1038/s41467-019-10188-y
ISSN: 2041-1723
Publisher: Nature Research (part of Springer Nature)
Journal / Book Title: Nature Communications
Volume: 10
Copyright Statement: © The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: MD Multidisciplinary
Publication Status: Published online
Conference Place: England
Open Access location: https://www.repository.cam.ac.uk/handle/1810/290736
Article Number: ARTN 2122
Online Publication Date: 2019-05-09
Appears in Collections:Chemistry
Centre for Environmental Policy



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