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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) March 29, 2018

Evidence for Photo-Switchable Carrier Mobilities in Blends of PbS Nanocrystals and Photochromic Dithienylcyclopentene Derivatives

Christine Schedel, Heiko Peisert, Thomas Chassé and Marcus Scheele

Abstract

We use derivatives of the photochromic molecule 1,2-bis(5′-carboxy-2′-methylthien-3′-yl)-cyclopentene in combination with semiconducting PbS nanocrystals to probe the feasibility of solid-state optical switching in hybrid nanostructured thin films. X-ray photoelectron spectroscopy is applied to differentiate between the different constituents in the blends, while field-effect transistor measurements in the dark reveal the effect of prior illumination with visible or ultra-violet light on the transport properties. By analyzing the response of the electric conductivity, the carrier concentration and mobility separately, we are able to distinguish between the effect of additional photo-excited charge carriers and photo-induced changes of the electronic structure of the semiconducting film. Our results suggest that coupling between the nanocrystals and the photochromic molecule is weak but also provide evidence that photochromism of the molecules may be partially preserved.


Dedicated to: Prof. Dr. Alexander Eychmüller on the occasion of his 60th birthday.


Acknowledgements

Financial support by the DFG under grants SCHE1905/3 and SCHE1905/4 is gratefully acknowledged.

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Received: 2018-01-28
Accepted: 2018-03-02
Published Online: 2018-03-29
Published in Print: 2018-08-28

©2018 Walter de Gruyter GmbH, Berlin/Boston