journal article·2019-01-09

Charge Carrier Polarity Modulation in Diketopyrrolopyrrole-Based Low Band Gap Semiconductors by Terminal Functionalization

Samrat Ghosh, Reshma Raveendran, Akinori Saeki, Shu Seki, Manoj Namboothiry, Ayyappanpillai Ajayaghosh

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Abstract

Organic semiconductors with variable charge carrier polarity are required for optoelectronic applications. Herein, we report the synthesis of three novel diketopyrrolopyrrole (DPP)-based D–A molecules having three different terminal groups (amide, ester, and dicyano) and study their electronic properties. An increase in electron acceptor strength from amide to dicyano leads to a bathochromic shift in absorption. Photoconductivity and field effect transistor (FET) measurements confirmed that a small increase in acceptor strength can result in a large change in the charge transport properties from p-type to n-type. The molecule with an amide group, DPP–amide, exhibited a moderate p-type mobility (1.3 × 10–2 cm2 V–1 s–1), whereas good n-type mobilities were observed for molecules with an ester moiety, DPP–ester (1.5 × 10–2 cm2 V–1 s–1), and with a dicyano group, DPP–DCV (1 × 10–2 cm2 V–1 s–1). The terminal functional group modification approach presented here is a simple and efficient method to alter the charge carrier polarity of organic semiconductors.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Molecular Junctions and Nanostructures · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR−National Institute for Interdisciplinary Science and Technology (CSIR−NIIST), Thiruvananthapuram 695019, India

Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST Campus, Thiruvananthapuram 695019, India

School of Physics, Indian Institute of Science Education and Research-Thiruvananthapuram (IISER-TVM), Thiruvananthapuram 695551, India

Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan

Funding

Council of Scientific and Industrial Research · Science and Engineering Research Board · Department of Science and Technology, Ministry of Science and Technology · Ministry of Human Resource Development

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