Photoresponse improvement of mixed-dimensional 1D–2D GaAs photodetectors by incorporating constructive interface states

Nanoscale ◽  
2021 ◽  
Author(s):  
Dengkui Wang ◽  
Xue Chen ◽  
Xuan Fang ◽  
Jilong Tang ◽  
Fengyuan Lin ◽  
...  
Keyword(s):  
Surface States ◽  
Interface States ◽  
Low Dimensional ◽  
Low Dimensional Materials

A mixed-dimensional photodetector was constructed to convert the harmful surface states of low-dimensional materials into their constructive interface states.

scholarly journals Fast Response GaAs Photodetector Based on Constructing Electron Transmission Channel

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1160
Author(s):  
Shuai Guo ◽  
Xue Chen ◽  
Dengkui Wang ◽  
Xuan Fang ◽  
Dan Fang ◽  
...  
Keyword(s):  
High Speed ◽  
Surface States ◽  
Response Speed ◽  
Fast Response ◽  
Transmission Channel ◽  
Electron Transmission ◽  
Speed Performance ◽  
Gaas Nanowire ◽  
Low Dimensional ◽  
Low Dimensional Materials

Low-dimensional GaAs photodetectors have drawn a great deal of attention because of their unique absorption properties and superior responsivity. However, their slow response speed caused by surface states presents challenges. In this paper, a mixed-dimensional GaAs photodetector is fabricated utilizing a single GaAs nanowire (NW) and a GaAs 2D non-layer sheet (2DNLS). The photodetector exhibits a fast response with a rise time of ~4.7 ms and decay time of ~6.1 ms. The high-speed performance is attributed to an electron transmission channel at the interface between the GaAs NW and GaAs 2DNLS. Furthermore, the fast electron channel is confirmed by eliminating interface states via wet passivation. This work puts forward an effective way to realize a high-speed photodetector by utilizing the surface states of low-dimensional materials.

scholarly journals The Highly Uniform Photoresponsivity from Visible to Near IR Light in Sb2Te3 Flakes

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1535
Author(s):  
Shiu-Ming Huang ◽  
Jai-Lung Hung ◽  
Mitch Chou ◽  
Chi-Yang Chen ◽  
Fang-Chen Liu ◽  
...  
Keyword(s):  
Band Structure ◽  
Energy Difference ◽  
Experimental Result ◽  
Light Illumination ◽  
Near Ir ◽  
State Band ◽  
Valence Bands ◽  
Low Dimensional ◽  
Low Dimensional Materials ◽  
Ir Light

Broadband photosensors have been widely studied in various kinds of materials. Experimental results have revealed strong wavelength-dependent photoresponses in all previous reports. This limits the potential application of broadband photosensors. Therefore, finding a wavelength-insensitive photosensor is imperative in this application. Photocurrent measurements were performed in Sb2Te3 flakes at various wavelengths ranging from visible to near IR light. The measured photocurrent change was insensitive to wavelengths from 300 to 1000 nm. The observed wavelength response deviation was lower than that in all previous reports. Our results show that the corresponding energies of these photocurrent peaks are consistent with the energy difference of the density of state peaks between conduction and valence bands. This suggests that the observed photocurrent originates from these band structure peak transitions under light illumination. Contrary to the most common explanation that observed broadband photocurrent carrier is mainly from the surface state in low-dimensional materials, our experimental result suggests that bulk state band structure is the main source of the observed photocurrent and dominates the broadband photocurrent.

scholarly journals Definition of a scoring parameter to identify low-dimensional materials components

2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Peter Mahler Larsen ◽  
Mohnish Pandey ◽  
Mikkel Strange ◽  
Karsten Wedel Jacobsen
Keyword(s):  
Definition Of ◽  
Low Dimensional ◽  
Low Dimensional Materials

scholarly journals Multiple Exciton Generation in Isolated and Interacting Silicon Nanocrystals

Nanoscale ◽  
2021 ◽  
Author(s):  
Ivan Marri ◽  
Stefano Ossicini
Keyword(s):  
Renewable Energy ◽  
Solar Cell ◽  
Silicon Nanocrystals ◽  
Photovoltaic Systems ◽  
Multiple Exciton Generation ◽  
Important Challenge ◽  
Low Dimensional ◽  
Low Dimensional Materials

An important challenge in the field of renewable energy is the development of novel nanostructured solar cell devices which implement low-dimensional materials to overcome the limits of traditional photovoltaic systems....

Reasonably designed 2D WS2 and CdS microwire heterojunction for high performance photoresponse

Nanoscale ◽  
2021 ◽  
Author(s):  
Z.Q. Zheng ◽  
Yuchen Zhou ◽  
Wei Gao ◽  
Li Zhang ◽  
Mengmeng Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Low Dimensional ◽  
Low Dimensional Materials

Heterojunctions based on low-dimensional materials can combine the superiorities of each composition and realize novel properties. Herein, a mixed-dimensional heterojunction comprising multilayer WS2, CdS microwire and few-layer WS2 has been...

Potential SiX (X = N, P, As, Sb, Bi) homo-bilayers for visible-light photocatalysts application

2021 ◽  
Author(s):  
Radha Somaiya ◽  
Deobrat Singh ◽  
Yogesh Kumar Sonvane ◽  
Sanjeev Kumar Gupta ◽  
Rajeev Ahuja
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Photocatalytic Water Splitting ◽  
Low Dimensional ◽  
Low Dimensional Materials

Low dimensional materials possess a challenge to identify a photocatalyst suitable for photocatalytic water splitting application. We have systematically investigated that SiN, SiP, and SiAs homo-bilayers are efficient for water...

Sign in / Sign up

Export Citation Format

Share Document