Anomalous temperature coefficient of resistance in graphene nanowalls/polymer films and applications in infrared photodetectors

• Main Authors: Zhang Hui, Zhao Kangyi, Cui Songya, Yang Jun, Zhou Dahua, Tang Linlong, Shen Jun, Feng Shuanglong, Zhang Weiguo, Fu Yongqi
• Format: Article
• Language: English
• Published: De Gruyter 2018-05-01
• Series: Nanophotonics
• Subjects: graphene nanowalls; ir; polymer; tcr; thermal detectors
• Online Access: https://doi.org/10.1515/nanoph-2017-0135

Graphene nanowalls (GNWs) exhibit outstanding optoelectronic properties due to their peculiar structure, which makes them a great potential in infrared (IR) detection. Herein, a novel IR detector that is composed of polydimethylsiloxane (PDMS) and designed based on GNWs is demonstrated. Such detector possesses an anomalous temperature coefficient of resistance of 180% K−1 and a relatively high change rate of current (up to 16%) under IR radiation from the human body. It primarily attributes to the ultra-high IR absorption of the GNWs and large coefficient of thermal expansion of PDMS. In addition, the GNW/PDMS device possesses excellent detection performance in the IR region with a responsivity of ~1.15 mA W−1. The calculated detectivity can reach 1.07×108 cm Hz1/2 W−1, which is one or two orders of magnitude larger than that of the traditional carbon-based IR detectors. The significant performance indicates that the GNW/PDMS-based devices reveal a novel design concept and promising applications for the future new-generation IR photodetectors.