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Performance improvement of organic phototransistors by using polystyrene microspheres

使用聚苯乙烯微球提高有机光敏晶体管性能

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Abstract

Organic phototransistors (OPTs) have been intensively studied in recent years due to the combined advantages of phototransistors and organic semiconductors (OSCs). However, the electrical performance of OPTs is largely limited by OSCs themselves, posing a challenge to further improve the performance of the devices. Preparing nano/micro-structures of OSCs is considered as an effective way to improve the performance of OPTs. Polystyrene (PS) microsphere, as a kind of insulating and low-cost material, is extensively used in fabricating nano/microporous structures, and the resulting devices exhibit high response to external stimuli. Therefore, we combined PS microspheres with OSCs to fabricate PS/OSC OPTs, and the Ilight/Idark ratio was enhanced by two orders of magnitude compared with the pristine counterparts, which can be modulated from 46 to 1800 by controlling the diameters of PS microspheres. This strategy paves a way for developing high-performance OPTs with nano/microporous structures with potential applications in organic optoelectronics.

摘要

有机光敏晶体管(OPTs)因结合了有机半导体和光敏晶体管的优势, 引起了科研工作者的广泛兴趣. 然而, OPTs性能很大程度上受限于有机半导体本身的性质, 这对进一步提高OPTs性能提出了挑战. 制备具有微纳结构的有机半导体被认为是提高器件性能的一种有效途径. 聚苯乙烯(PS)微球作为一种绝缘和低成本的材料, 可应用于制备微纳结构的器件, 使器件实现对外部刺激的超高响应. 本文中, 我们利用PS微球杂化有机半导体来制备具有微纳结构的OPTs, 使其光电流/暗电流(光灵敏度)提高了两个数量级, 并且通过调控PS微球的直径, 使光灵敏度从46增大到1800. 此研究结果为制备具有微纳孔结构的OPTs提供了新方法, 扩大了其在有机光电子中的应用.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (51741302, 51603151 and 51373123), the National Key Research and Development Program of China (2017YFA0103900 and 2017YFA0103904), Science and Technology Foundation of Shanghai (17JC1404600), and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China

    Bilei Zhou  (周碧蕾), Jiachen Zhou  (周佳晨), Yantao Chen  (陈彦涛), Yingli Chu  (褚莹莉), Jia Huang  (黄佳) & Xiaohan Wu  (吴小晗)

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  1. Bilei Zhou  (周碧蕾)
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  2. Jiachen Zhou  (周佳晨)
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  3. Yantao Chen  (陈彦涛)
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  4. Yingli Chu  (褚莹莉)
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  5. Jia Huang  (黄佳)
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  6. Xiaohan Wu  (吴小晗)
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Correspondence to Xiaohan Wu  (吴小晗).

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Bilei Zhou received her bachelor degree from the School of Materials Science and Engineering, Wuhan University of Technology, Hubei, China. She is currently pursuing Master degree in the School of Materials Science and Engineering, Tongji University, Shanghai, China. Her main research includes the preparation and optoelectronic performance of photodetectors based on composite semiconductors.

Xiaohan Wu is now an assistant professor in the School of Materials Science and Engineering at Tongji University in Shanghai. He received the PhD degree in chemistry and biology for health at the University of Montpellier I, France. His research interests refer to organic semiconductors and biomaterials, biocompatible and flexible electronics; organic fieldeffect transistors; highly sensitive temperature and optical sensors; self-assembly of amphiphilic bio-copolymers; nano particles for drug controlled release.

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Zhou, B., Zhou, J., Chen, Y. et al. Performance improvement of organic phototransistors by using polystyrene microspheres. Sci. China Mater. 61, 737–744 (2018). https://doi.org/10.1007/s40843-017-9164-2

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