Abstract
Three-dimensional (3D) cross-linked polymer-like reduced graphene oxide foams (rGOFs) with a seamlessly continuous graphene network, exhibit high photoresponsive and conductivity and have received much attention regarding solar cells and supercapacitors. However, little attention has been paid to photodetection applications of 3D rGOFs. Here we report a novel broadband phototransistor based on metal-3D GFs-metal, which exhibits a high light absorption and a wide spectra response ranging at least from 400 to 1600 nm wavelength with a maximum photoresponsivity of 10 mA/W at 400 nm. In particular, stable and reproducible photocurrent cycles are achieved under different light blue light (405 nm), green light (532 nm), and NIR (808 nm) irradiations. Moreover, the device displays a typical transistor characteristic with a rapid response time of 18 ms at under 532 nm irradiation. The excellent performances indicate 3D rGOF as a promising candidate for future photodetection application.
Highlights
Graphene consisting of a sp2 hybridized C–C bonds in a honeycomb-like structure, exhibits unique optoelectronic characteristics, such as high carrier mobility, and superconductivity [1,2], which can potentially be applied in many applications, such as optical communication, biomedical imaging, night-vision and remote sensing [3,4,5,6,7,8]
The 3D reduced graphene oxide foams (rGOFs) supplied by Yongsheng Chen group Nankai University were synthesized by hydrothermal reduction method using graphene oxide (GO) solutions, following the optimized the synthetic method reported before [23,25]
The as-prepared 3D rGOF samples were carefully transferred on Sin+/SiO2 substrates which were treated in a UV ozone system (Mvcro, Beijing, China) for 15 min
Summary
Graphene consisting of a sp hybridized C–C bonds in a honeycomb-like structure, exhibits unique optoelectronic characteristics, such as high carrier mobility, and superconductivity [1,2], which can potentially be applied in many applications, such as optical communication, biomedical imaging, night-vision and remote sensing [3,4,5,6,7,8]. Single-, bi-, and tri-layer graphene phototransistors have been reported [9,10,11,12,13,14,15,16,17], which reveal a strong photoresponse within the metal and graphene channel. They show a strong interband transition as compared to other materials [18]. In graphene-based photodetectors, the low photoresponsivity is mainly attributed to the low optical absorption in monolayer graphene and the short recombination lifetime (on the scale of a picosecond) of the photo-generated carriers [21]
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