Self-powered diamond ultraviolet photodetector with a transparent Ag nanowire electrode

Abstract

A novel diamond UV photodetector with a transparent Ag nanowire (NW) electrode was fabricated. A transparent Ag NW network was spin-coated on single crystalline diamond to form a Schottky contact, which had a barrier height of about 1.37 eV obtained by XPS measurements. Meanwhile, multilayered metals of Au/Pt/Ti were evaporated on the diamond sample to form ohmic contacts. Compared to a Au/Pt/Ti-Au/Pt/Ti diamond photodetector, the Au/Pt/Ti-Ag NW diamond photodetector exhibited relatively high responsivity under 220 nm (18 mA W−1), high linear dynamic range (41 dB), and short response time (0.12 s for rise time, 0.56 s for decay time). In particular, the Au/Pt/Ti-Ag NW diamond photodetector displayed high photocurrent of about 200 pA at zero-bias, indicating its potential for creating self-powered devices.

Flatten the Li‐ion Activation in Perfectly Lattice‐Matched MXene and 1T‐MoS2 Heterostructures via Chemical Functionalization

“…Since been discovered, MXenes are proved to have great potential and application in energy storage and catalysis because of their highly active surfaces, good conductivity, abundant functional groups, and facile synthesis. [ 8–11 ] For instance, Ti 3 C 2 has been proved to have good performance as anode materials for LIB with 123.6 mAh g –1 at 1 C rate. [ 12 ] Theoretical study identified a low barrier (0.068–0.070 eV) of Li diffusing above the surface.…”

Self-Powered Solar-Blind UV Detectors Based on O-Terminated Vertical Diamond Schottky Diode with Low Dark Current, High Detectivity, and High Signal-to-Noise Ratio

“…14 Thus, the LDR of detector Mesh reaches 105.9 dB at 220 nm and 0 V bias, which is significantly higher than the LDR of 41 dB of a self-powered diamond ultraviolet photodetector with a transparent Ag nanowire electrode. 14 From Figure 4, the detectors with responsivity larger than 1000 mA/W are located at the upper right while those with smaller than 200 mA/W are located at the lower left. It might be inferred that detectors with higher dark current can easily obtain high responsivity, but their SNR is usually lower.…”

“…Inset: optical image of detector Semi (left) and Mesh (right) taken by Redmi K40 Pro. Data in this figure from references. − ,,,− …”

“…Another important parameter for a detector is the signal-to-noise ratio (SNR), ,, defined as SNR = I ph / I dark , which determines the sensitivity of the detector. The SNR of detector Mesh reaches 2.0 × 10 5 at zero bias and 220 nm UV light illumination, owing to the extremely low dark current.…”

“…Recently, diamond photovoltaic diodes have been used for UV detection. A UV detector based on p-i-n diode was fabricated by Liu et al, 12 which had a responsivity of 1.69 A/W and dark current of 0.35 μA at 5 V. A diamond/graphene heterojunction detector with 1.4 A/W responsivity and 2 × 10 −6 A/cm 2 dark current was developed by Wei et al 13 Li et al 14 reported self-powered diamond UV detector using a Ag nanowire electrode, and it had a responsivity of 18 mA/W and 3.2 pA dark current at 3 V. A self-powered UV detector based on ultrananocrystalline diamond nanowire was fabricated by Zhou et al 15 showing 388 A/W responsivity and 0.07 μA dark current. However, due to the material property or device structure, their dark currents are usually considerably higher than diamond photoconduc- tors, resulting in lower SNR.…”