Position‐Sensitive Array Photodetector Based on Comb‐Like CdS Nanostructure with Cone‐Shape Branches

Abstract

2D microscale position-sensitive detectors (PSDs) are highly desirable with the degree of integration increase and the size reduction of nanodevices, which are still unavailable. Multichannel devices with outstanding photoelectric properties attract considerable interest as powerful building blocks to be applied in on-chip systems. Here, based on a highly ordered comb-like CdS nanowire array with cone-shape branches through a one-step synthesis strategy, a high-resolution 2D position-sensitive photodetector is realized through variable resistance in different transportation routes and variable optical responses at different parts of the cone-shape branches, which enable accurate position identification of incident light in various zones of nanowire arrays according to photocurrent changes. In a broadband from 310 to 560 nm, the PSD exhibits high sensitivity with 85 and 58 KΩ µm −1 in the trunk and branch part, respectively, and an ultrafast optical response shorter than tens of millisecond. Moreover, a lower conductivity change rate per unit temperature of the PSD (1.625 × 10 −9 A V −1 K −1 ) than that of commercial Sibased PSDs (≈6.67 × 10 −7 A V −1 K −1 ) reveals outstanding low-temperature performance. Finally, the multichannel nanostructure based PSD with nanoscale resolution is applied to high-accuracy quadrant photodetectors.

Printable and Stretchable Giant Magnetoresistive Sensors for Highly Compliant and Skin‐Conformal Electronics

“…Rapid growth and high acceptance of flexible electronics are facilitated by a great demand for personalized services in the ubiquitous era such as personal health‐monitoring, [ 1–3 ] electronic skins, [ 4–6 ] soft robots, [ 7 ] augmented reality, [ 8 ] and internet of things (IoTs). [ 9 ] Central to these customized appliances is the establishment of highly adaptable and skin‐conformal functional elements capable of recognizing environmental changes through all aspects of daily life or to track position, motion and gestures by responding to electrical, [ 2,10 ] magnetic, [ 5,6,8,11 ] optical, [ 12 ] and thermal [ 13 ] stimuli. Solution‐processable printing technologies are very attractive for the realization of human interactive and highly compliant devices as they are simple, cost‐efficient and adaptable to various materials at freely defined layouts for functional elements.…”

Photodetectors Based on Micro-nano Structure Material

“…In 2019, Li et al developed a method capable of heterogeneous integration of atomically thin 2D crystal arrays for system-on-chip electrons on a planar patterned silicon substrate ( Li et al, 2019 ). In addition, multi-channel devices with good optical and electrical characteristics are widely used in system-on-chip ( Hao et al, 2019 ). Schematic diagram of CdS branch photodetector.…”

Generation of a Charge Carrier Gradient in a 3C-SiC/Si Heterojunction with Asymmetric Configuration

“…Nonuniform light irradiation (e.g., from a laser source) causes a photogenerated carrier concentration gradient between the illuminated and nonilluminated regions, which subsequently results in a voltage. A large number of potential applications have been demonstrated based on the LPE such as surface profiling, motion tracking, and angular displacement monitoring. , Position-sensitive detector (PSD), one of the most common application of the LPE, has significantly progressed over the last few decades due to the development of technologies for the synthesis of new materials and heterostructures. LPE-based PSDs can be divided into four categories based on the type of heterostructures including metal–semiconductor (MS) (e.g., Ti (Co,Cu)/Si, graphene/Si, MoS 2 /Si − ), metal-oxide–semiconductor (MOS) (e.g., Co/SiO 2 /Si, SnSe/SiO 2 /Si), oxide/insulator–semiconductor (e.g., Fe 3 O 4 /Si, Bi 2 Te 2.7 Se 0.3 , ITO/Si), and wide band/narrow band semiconductor–narrow band semiconductor (e.g., SiC/Si, − Sb 2 Se 3 /Si, SnSe 2 /Si).…”