Organic-Single-Crystal Vertical Field-Effect Transistors and Phototransistors

Jinyu Liu; Ke Zhou; Jie Liu; Jia Zhu; Yonggang Zhen; Huanli Dong; Wenping Hu

doi:10.1002/adma.201803655

Organic-Single-Crystal Vertical Field-Effect Transistors and Phototransistors

Adv Mater. 2018 Nov;30(44):e1803655. doi: 10.1002/adma.201803655. Epub 2018 Sep 14.

Authors

Jinyu Liu^{1

2}, Ke Zhou¹, Jie Liu¹, Jia Zhu³, Yonggang Zhen¹, Huanli Dong¹, Wenping Hu^{1

4}

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
² School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100190, China.
³ Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing, 100875, China.
⁴ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China.

PMID: 30589469
DOI: 10.1002/adma.201803655

Abstract

Organic vertical field-effect transistors (VFETs) have attracted significant attention over the past years due to their unique characteristics of high output currents, low operation voltages, high working frequency, and promising high-density integration for circuits. However, most currently reported VFETs demonstrate poor performance, e.g., with low on/off ratio and current density. Here, the first organic-single-crystal vertical field-effect transistors (SC-VFETs) and phototransistors are constructed from 2,6-diphenyl anthracene (DPA) through a modified method. The devices exhibit high on/off ratio of 10⁶ and a high current density of 100 mA cm^-2 under a small voltage of -5 V, which are proved to be one of the best performances for organic VFETs. Furthermore, superior photoresponse performance with photoresponsivity of 110 A W^-1 and detectivity of 10¹³ Jones is obtained under light illumination for vertical phototransistors. These results confirm the control of the intrinsic Schottky barrier height at the graphene-DPA junction along with good interfacial contact effectively suppressing the dark current to realize a large on/off ratio and high light detectivity. This vertical integration of graphene with organic single crystals via simple, effective fabrication processes opens up new opportunities to realize high-performance integrated organic vertical electronic and optoelectronic devices.

Keywords: organic electronics; organic field‐effect transistors; organic phototransistors; organic single crystals.

Abstract

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