Tactile and temperature sensors based on organic transistors: Towards e-skin fabrication
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Front. Phys. 16(1), 13302 (2021)
Topical Review Tactile and temperature sensors based on organic transistors: Towards e-skin fabrication Miao Zhu1 , Muhammad Umair Ali2,3 , Changwei Zou1 , Wei Xie1 , Songquan Li1 , Hong Meng3,† 1
School of Physical Science and Technology, Lingnan Normal University, Zhanjiang 524048, China Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China 3 School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen 518055, China Corresponding author. E-mail: † [email protected] Received July 21, 2020; accepted August 8, 2020 2
Tactile and temperature sensors are the key components for e-skin fabrication. Organic transistors, a kind of intrinsic logic devices with diverse internal configurations, offer a wide range of options for sensor design and have played a vital role in the fabrication of e-skin-oriented tactile and temperature sensors. This research field has attained tremendous advancements, both in terms of materials design and device architecture, thereby leading to excellent performance of resulting tactile/temperature sensors. Herein, a systematic review of organic transistor-based tactile and temperature sensors is presented to summarize the latest progress in these devices. Particularly, we focus on spotlighting various device structures, underlying mechanisms and their performance. Lastly, an outlook for the future development of these devices is briefly discussed. We anticipate that this review will provide a quick overview of such a rapidly emerging research direction and attract more dedicated efforts for the development of next-generation sensing devices towards e-skin fabrication. Keywords tactile sensor, temperature sensor, flexible, e-skin, organic transistor
Contents 1 2
Introduction Tactile sensors 2.1 Capacitive-type tactile sensors 2.2 Piezoelectric-type tactile sensors 2.3 Resistive-type tactile sensors 2.4 Other types of tactile sensors 3 Temperature sensors 3.1 Integrated organic transistor-based temperature sensors 3.2 Intrinsic organic transistor-based temperature sensors 4 Conclusion and perspectives Acknowledgements References
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1 Introduction From the ages of World War I, efforts to develop robots that could help (even replace) human beings to perform tough tasks have been continuously increasing which led to the realization of intelligent machines that tend to ∗ Special
Topic: Organic Semiconductors and OFETs (Eds. Hong Meng & Guangcun Shan).
evolve more and more closely to a real human in near future. However, without strong sensing capability of human skin, the “hard” body of a robot is more like to be just the exoskeleton of crabs. Lately, the development of micro-nano materials and sensors makes it possible to incorporate massive and a variety of sensors in the robot’s body to enhance the sensing ability. Furthermore, the rise of conductive polymers [1–3] and advances in the booming research on flexible electronics [4–7] g
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