Band-like transport in small-molecule thin films toward high mobility and ultrahigh detectivity phototransistor arrays

Deyang Ji, Tao Li (), Jie Liu, Saeed Amirjalayer, Mianzeng Zhong, Zhao-Yang Zhang, Xianhui Huang, Zhongming Wei, Huanli Dong, Wenping Hu () and Harald Fuchs ()
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Deyang Ji: Westfälische Wilhelms-Universität
Tao Li: Shanghai Jiao Tong University
Jie Liu: Chinese Academy of Sciences
Saeed Amirjalayer: Westfälische Wilhelms-Universität
Mianzeng Zhong: University of Chinese Academy of Sciences
Zhao-Yang Zhang: Shanghai Jiao Tong University
Xianhui Huang: Shanghai Jiao Tong University
Zhongming Wei: University of Chinese Academy of Sciences
Huanli Dong: Chinese Academy of Sciences
Wenping Hu: Chinese Academy of Sciences
Harald Fuchs: Westfälische Wilhelms-Universität

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract With the fast development of organic electronics, organic semiconductors have been extensively studied for various optoelectronic applications, among which organic phototransistors recently emerged as one of the most promising light signal detectors. However, it is still a big challenge to endow organic phototransistors with both high mobility and high light-sensitivity because the low mobility of most organic photoresponsive materials limits the efficiency of transporting and collecting charge carriers. We herein report band-like charge transport in vacuum-deposited small-molecule thin films for organic phototransistor arrays which can be operated at very low dark currents (~10−12 A). Both high mobility and excellent optical figures of merit including photosensitivity, photoresponsivity and detectivity are achieved, wherein, unprecedentedly, a detectivity greater than 1017 cm Hz1/2 W−1 is obtained. All these key parameters are superior to state-of-the-art organic phototransistors, implying a great potential in optoelectronic applications.

Date: 2019
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DOI: 10.1038/s41467-018-07943-y

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