Ag2S QDs/Si Heterostructure-Based Ultrasensitive SWIR Range Detector

Abstract

In the 20th century, microelectronics was revolutionized by silicon—its semiconducting properties finally made it possible to reduce the size of electronic components to a few nanometers. The ability to control the semiconducting properties of Si on the nanometer scale promises a breakthrough in the development of Si-based technologies. In this paper, we present the results of our experimental studies of the photovoltaic effect in Ag2S QD/Si heterostructures in the short-wave infrared range. At room temperature, the Ag2S/Si heterostructures offer a noise-equivalent power of 1.1 × 10−10 W/√Hz. The spectral analysis of the photoresponse of the Ag2S/Si heterostructures has made it possible to identify two main mechanisms behind it: the absorption of IR radiation by defects in the crystalline structure of the Ag2S QDs or by quantum QD-induced surface states in Si. This study has demonstrated an effective and low-cost way to create a sensitive room temperature SWIR photodetector which would be compatible with the Si complementary metal oxide semiconductor technology.

Low‐Temperature Growth of High‐Quality Ag2HgS2 Crystals for Setup of Weak‐Light UV–Visible–NIR Photodetectors

“…[53] However, it is interesting that the present MSM type photodetectors based on the Ag 2 HgS 2 SCRs show linear responses, and they perform equivalent and high responsivities compared with most high-level van der Waals heterojunction photodetectors. [62][63][64][65] In fact, it is also worth noting that the Ag 2 HgS 2 SCRs photodetectors perform better than the InGaAs photodetectors (PDA20C2, Thorlabs, effective wavelength range between ≈800 and 1700 nm, Responsivity = 1 A W −1 , NEP = 2.2 × 10 −11 W Hz −1/2 ) and PbSe photodetectors (PDA20H, Thorlabs, NEP = 1.5 × 10 −10 W Hz −1/2 ) that have been commercially used. The investigations illustrate that the as-made Ag 2 HgS 2 -based photodetectors with extraordinary performance are highly potential for practical applications, especially in weak light photodetection including infrared regions in the future since Ag 2 HgS 2 is an alternatively promising and qualified candidate due to its intrinsic property and excellent photodetecting behavior.…”

High-Responsivity Vis–NIR Photodetector Based on a Ag2S/CsPbBr3 Heterojunction

“…19,20 Combinations of two dissimilar materials to form heterostructures have been widely demonstrated. 21 Tretyakov et al 22 reported a Ag 2 S QD/Si heterostructure short-wave infrared photodetector. Xie et al 23 introduced a MoTe 2 /CsPbBr 3 heterojunction photodetector.…”

Investigation of photoelectric behaviors of silver sulfide particles in different surroundings

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Apart from the above applications, in recent years, more and more attention has been focused on its potential application in photodetectors due to their near-infrared transparency, low cost, nontoxicity and compatibility with silicon integrated circuits. [18][19][20] Kang et al prepared a photodetector by assembling Ag 2 S nanoparticles on the silicon oxide substrate and covering a layer of graphene on the top of Ag 2 S nanoparticles. They found that the photodetector showed a high photoresponse of 2723.2 A W À1 under 550 nm illumination with 0.89 mW cm À2 .…”

“…They found that their photodetector is highly sensitive to wavelengths from 400 nm to 1100 nm and the response is fast, less than 5 ms. 22 Ismail et al and Tretyakov et al prepared Ag 2 S/Si heterojunction photodetectors. 20,23 Ismail et al found that the properties of the detector were dependent upon the Ag 2 S nanotube deposition time and the maximum responsivity was found to be ca. 0.5 A W −1 at 850 nm.…”

“… 23 Tretyakov et al reported the photovoltaic effect of the detector based on Ag 2 S quantum dots and Si heterostructure and discussed the mechanisms of infrared absorption: crystal defect absorption of Ag 2 S or surface state absorption of Si. 20 Tang et al prepared Ag 2 Se@Ag 2 S core–shell nanocrystals by an improved solution reaction method, and found that the nanocrystals showed sensitive near-infrared photodetection. 24 Lei et al reported flexible self-powered Ag 2 S photodetector by sandwiching silver film between Ag 2 S and organic substrate for the first time, and results showed that the device could withstand ca.…”