Journal
ADVANCED SCIENCE
Volume 5, Issue 9, Pages -Publisher
WILEY
DOI: 10.1002/advs.201800714
Keywords
carbon dots; charge trapping; Kelvin probe force microscopy; resistive switching; silk
Categories
Funding
- Natural Science Foundation of China [61601305, 61604097]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20170818143618288, JCYJ20170302145229928, JCYJ20170302151653768, KQJSCX20170727100433270, KQJSCX20170327150812967]
- Guangdong Provincial Department of Science and Technology [2017A010103026]
- Department of Education of Guangdong Province [2015KQNCX141, 2016KTSCX120]
- Natural Science Foundation of SZU
- City University of Hong Kong's Research Grant Project [9667145]
- RGC of Hong Kong Project [T42-103/16N]
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Phototunable biomaterial-based resistive memory devices and understanding of their underlying switching mechanisms may pave a way toward new paradigm of smart and green electronics. Here, resistive switching behavior of photonic biomemory based on a novel structure of metal anode/carbon dots (CDs)-silk protein/indium tin oxide is systematically investigated, with Al, Au, and Ag anodes as case studies. The charge trapping/detrapping and metal filaments formation/rupture are observed by in situ Kelvin probe force microscopy investigations and scanning electron microscopy and energy-dispersive spectroscopy microanalysis, which demonstrates that the resistive switching behavior of Al, Au anode-based device are related to the space-charge-limited-conduction, while electrochemical metallization is the main mechanism for resistive transitions of Ag anode-based devices. Incorporation of CDs with light-adjustable charge trapping capacity is found to be responsible for phototunable resistive switching properties of CDs-based resistive random access memory by performing the ultraviolet light illumination studies on as-fabricated devices. The synergistic effect of photovoltaics and photogating can effectively enhance the internal electrical field to reduce the switching voltage. This demonstration provides a practical route for next-generation biocompatible electronics.
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