High-Performance Photo-Modulated Thin-Film Transistor Based on Quantum dots/Reduced Graphene Oxide Fragment-Decorated ZnO Nanowires

Abstract

In this paper, a photo-modulated transistor based on the thin-film transistor structure was fabricated on the flexible substrate by spin-coating and magnetron sputtering. A novel hybrid material that composed of CdSe quantum dots and reduced graphene oxide (RGO) fragment-decorated ZnO nanowires was synthesized to overcome the narrow optical sensitive waveband and enhance the photo-responsivity. Due to the enrichment of the interface and heterostructure by RGO fragments being utilized, the photo-responsivity of the transistor was improved to 2000 A W−1 and the photo-sensitive wavelength was extended from ultraviolet to visible. In addition, a positive back-gate voltage was employed to reduce the Schottky barrier width of RGO fragments and ZnO nanowires. As a result, the amount of carriers was increased by 10 folds via the modulation of back-gate voltage. With these inherent properties, such as integrated circuit capability and wide optical sensitive waveband, the transistor will manifest great potential in the future applications in photodetectors.

Flexible Tactile Electronic Skin Sensor with 3D Force Detection Based on Porous CNTs/PDMS Nanocomposites

“…Generally speaking, tactile sensors imitate human perception of pressure with capability of detecting shapes and sliding conditions of the contact objects. Compared with silicon-based devices with high hardness and effective Young's modulus, flexible materials are more suitable for bionic tactile applications due to the good adherence, tensility and flexibility [9][10][11]. A variety of flexible materials such as polyethylene (PE) [12], polydimethylsiloxane (PDMS) [13,14], polyurethane (PU) [15] and polyimide (PI) [16] have been applied to tactile sensors, and the operational principles of tactile sensors mainly include piezoresistive [17][18][19], capacitive [20], piezoelectric [21] and optical [22].…”

Colloidal Nanosurfactants for 3D Conformal Printing of 2D van der Waals Materials

“…[ 52 ] By taking account of the UV exposed area, the normalized photocurrent densities of three types of devices are obtained (Figure S16, Supporting Information). At a bias voltage of 2 V, the cross‐plane devices showed a high photocurrent of 32.1 µA and maximum photocurrent density of 458 µA cm −2 , which is several times higher than some reported graphene‐based photodetectors, [ 53–56 ] such as CdTe‐ or CdSe‐doped graphene systems. [ 53,56 ] The cross‐plane devices demonstrated a superior performance compared with in‐plane counterparts likely due to the short vertical carrier transit path, which facilitates the transport of photogenerated carriers.…”

“…At a bias voltage of 2 V, the cross‐plane devices showed a high photocurrent of 32.1 µA and maximum photocurrent density of 458 µA cm −2 , which is several times higher than some reported graphene‐based photodetectors, [ 53–56 ] such as CdTe‐ or CdSe‐doped graphene systems. [ 53,56 ] The cross‐plane devices demonstrated a superior performance compared with in‐plane counterparts likely due to the short vertical carrier transit path, which facilitates the transport of photogenerated carriers. [ 57 ] As a proof‐of‐concept demonstration of developing advanced 3D sensing architectures, an array of five 3D photodetector devices is conformally printed on a hemispherical glass (radius: 15 mm.)…”

Printable Organic PIN Phototransistor and Its Application for Low Power and Noise Imaging Detection

“…Compared with photodiode PD, photo-transistor (PT) provides intrinsic amplification for photogenerated carriers enabling higher gain detection at weak light detection with higher photo-detectivity [5]. Especially, the perovskite (PVK, CsPbBr3) Quantum Dots (QDs) based PT has been reported to achieve high opto-electric performances.…”