Reduced graphene oxide-based broad band photodetector and temperature sensor: effect of gas adsorption on optoelectrical properties

Abstract

Reduced graphene oxide (rGO) has found tremendous application due to its versatile and tunable properties. We have prepared rGO by green hydrothermal method without using any toxic additives that comprise of ~ 5-14 layers with an average interlayer distance of 3.5 Å. Device with Ag-rGO-Ag configuration has been fabricated that exhibits excellent stable and reproducible photoresponse properties ranging from UV-VIS (ultraviolet-visible) to near IR (infrared) region. Responsivity and external quantum efficiency (EQE) values are as high as 0.71, 0.733, 0.230 and 0.313A.W-1 and 57, 85, 88 and 120% using 1550, 1064, 632 and 325 nm wavelength, respectively. We have shown that the temperature-dependent resistance follows a well-definite exponential behavior which indicates potential application of rGO as temperature sensor. Overall, these results suggest that rGO can be a potential material for low-cost, environment-friendly and efficient broadband photodetector and temperature sensor. Also,

Defect-Mediated Transport in Self-Powered, Broadband, and Ultrafast Photoresponse of a MoS2/AlN/Si-Based Photodetector

“…From the last few decades, substantial research is being done in the field of photodetectors which has led to immense improvements in their performance such as very high responsivities, ultrafast response, and photodetection in a broad range of wavelengths. − Therefore, photodetectors find their applications in a wide variety of fields ranging from day-to-day consumer electronics to more advanced and complex applications, such as industrial and environmental monitoring, flame detection, space communication systems, optical communication, missile technology, proximity sensors, and so forth. ,− Typically, these photodetectors require an externally applied bias as the driving force for efficient separation of the photogenerated electron–hole pairs. ,, Consequently, for systems containing a large number of sensors, energy supply becomes one of the major challenges in the current energy scenario. In regard to the global energy crisis, lots of efforts are being made in the fields of photovoltaics, supercapacitors, thermoelectrics, and self-powered nanodevices. − Self-powered photodetectors, which generate a self-sufficient potential for effective separation of the photogenerated charge carriers, have recently attracted considerable attention because of their numerous advantages. − …”

Solution-Processed SnSe2–RGO-Based Bulk Heterojunction for Self-Powered and Broadband Photodetection

“…As shown in Figure 1b, RGO bands are seen at 1348 (D band), 1575 (G band), 2690, and 2931 cm −1 (2D band). 33,34 Also, inplane and out-of-plane vibrational modes of hexagonal phase SnSe 2 are observed at 106 (E g ) and 181 cm −1 (A 1g ), respectively 35 (zoomed view shown in the inset of Figure 1b).…”

Liquid‐Exfoliated 2D Materials for Optoelectronic Applications

“…Majority of the reports of liquid-exfoliated graphene-based photodetector devices were fabricated by exfoliation of graphene oxide (GO) nanosheets in aqueous solvents, where the GO were obtained by a modified Hummers method [189][190][191] by oxidizing the starting graphite bulk powder. [71][72][73][74]76,78,[82][83][84]293,[323][324][325][326][327][328][329][330] Variety of oxygen-containing functional groups on the basal planes and at the edge sites makes the GO highly hydrophilic and easily dispersible in water and sonicated to achieve the exfoliated state. For further optoelectronic device applications, chemical reduction and/or annealing of GO is required to restore the initial aromatic conjugation structure of graphene and to restore the electrical conductivity.…”