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Scanning photocurrent microscopy of electrons and holes in the pigment semiconductor epindolidione
Ludwig Maximilian Univ Munchen, Germany; NIM, Germany.
Ludwig Maximilian Univ Munchen, Germany.
Ludwig Maximilian Univ Munchen, Germany.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-0280-8017
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2018 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 60, p. 51-56Article in journal (Refereed) Published
Abstract [en]

Photocurrent microscopy is used to characterize the kinetics of electrons and holes in organic field-effect transistors (FETs) with the hydrogen-bonded pigment epindolidione as active layer. The method relies on electrons and holes, generated on local illumination, which are provided after exciton splitting, to probe charge trapping. In the dark, hole conduction is observed for negative gate voltage while no electron conduction is observed for positive gate voltage. However, under illumination, a fast displacement current with 60 mu s onset time and 1 ms exponential decay occurs for positive gate voltage, which can be explained by exciton splitting underneath the semitransparent top contact followed by subsequent electron trapping and hole extraction. Afterward, trapped electrons hop via further trap states within the film to the insulator into interface traps (13 ms exponential decay) which induce a positive threshold voltage shift in the FET transfer curves for hole transport. Photocurrent microscopy confirms that the displacement current occurs only for illumination under and near the semitransparent source/drain contacts, which act here as metal-insulator-semiconductor (MIS) diodes. For negative gate voltage instead, the photocurrent comprises an enhanced hole current in the FET channel between the contacts. In the channel region, the detrapping of holes at the interface with the insulator (3 ms time constant) enhances the transistor current at low frequencies amp;lt; 1 kHz, whereas the displacement current between the contacts and the gate is observed only at frequencies amp;gt; 10 kHz. Thus, we show here that photocurrent microscopy allows to identify the kinetics of electrons and holes in traps close to the contacts and in the FET channel of pigment transistors.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 60, p. 51-56
Keywords [en]
Photoresponse microscopy; Thin-film transistors; Charge-transport; Minority carriers; Majority carriers
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-149332DOI: 10.1016/j.orgel.2018.05.032ISI: 000434154500008OAI: oai:DiVA.org:liu-149332DiVA, id: diva2:1229852
Note

Funding Agencies|Bavarian Ministry for Science through the initiative "Solar Technologies Go Hybrid" (SolTech); Wallenberg Center for Molecular Medicine at Linkoping University

Available from: 2018-07-02 Created: 2018-07-02 Last updated: 2018-10-05

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