DataVXAdvanced Optical MaterialsPaper
journal article·2021-07

1550 nm Compatible Ultrafast Photoconductive Material Based on a GaAs/ErAs/GaAs Heterostructure

Kedong Zhang, Yiwen Li, Yifeng Ren, Xing Fan, Chen Li, Jianfei Li, Yafei Meng, Yu Deng, Fengqiu Wang, Hong Lu, Yan‐Feng Chen

Advanced Optical Materials· Volume 9· Issue 13
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Source abstract

Abstract

Abstract The sub‐bandgap absorption and ultrafast relaxation in a GaAs/ErAs/GaAs heterostructure are reported. The infrared absorption and 1550 nm‐excited ultrafast photo‐response are studied by Fourier transform infrared spectrometry and time‐domain pump–probe technique. The two absorption peaks located at 2.0 (0.62 eV) and 2.7 µm (0.45 eV) are originated from the ErAs/GaAs interfacial Schottky states and the ErAs itself, respectively. The photo‐excited carrier lifetime, excited using 1550 nm light, is measured to be as low as 190 fs for the GaAs/ErAs/GaAs heterostructure, making it a promising material for 1550‐nm‐technology‐compatible, high critical‐breakdown‐field THz devices. The relaxation mechanism is proposed and the functionality of ErAs is revealed.
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Research context

OpenAlex topics: Terahertz technology and applications · Superconducting and THz Device Technology · Semiconductor Quantum Structures and Devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Laboratory of Solid State Microstructures Department of Materials Science and Engineering College of Engineering and Applied Sciences Nanjing University Nanjing 210093 P. R. China

School of Electronic Science and Engineering Nanjing University Nanjing 210093 P. R. China

Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 P. R. China

Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing 210093 P. R. China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Jiangsu Province · Fundamental Research Funds for the Central Universities

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