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Electrical Detection of Singlet Fission in Single Crystal Tetracene Transistors

Published

Author(s)

Hyuk-Jae Jang, Emily G. Bittle, Qin Zhang, Adam J. Biacchi, Curt A. Richter, David J. Gundlach

Abstract

Here, we present the electrical detection of singlet fission in tetracene by using a field- effect transistor (FET). Singlet fission is a photo-induced spin-dependent process yielding two triplet excitons from the absorption of a single photon. , In this study we engineered a more deterministic platform composed of an organic single crystal than conventionally used thin film based systems to elucidate spin-dependent processes under magnetic fields. Despite the unipolar operation and relatively high mobility of single crystalline tetracene FETs, we were able to manipulate spin dependent processes to produce a few percent of magnetoconductance (MC) at room temperature by illuminating the FETs and tuning bias voltages to adjust majority charge carrier density. In considering the crystalline direction and magnetic field interactions in tetracene we show the uniqueMC response observed in rubrene FETs to be the result of the singlet fission process
Citation
ACS Nano
Volume
13
Issue
1

Keywords

spintronics, organic electronics, nanoelectronics, organic field-effect transistor, exciton, singlet-triplet fission, magnetoresistance
Created January 4, 2019, Updated February 26, 2019