Enhanced Absorptivity of Quantum Dot Infrared Photodetector by Introducing of Metal Nanostructure Layer
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Enhanced Absorptivity of Quantum Dot Infrared Photodetector by Introducing of Metal Nanostructure Layer Hongmei Liu 1,2 & Liang JunJun 3 & Qiaowen Lin 2 & Zhixiang Gao 1,2 & Jiangang Li 1,2 & Chunhua Yang 2 & Guodong Wei 4 Received: 27 December 2019 / Accepted: 11 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Quantum dot infrared photodetector (QDIP) shows more superior characteristics; however, the low absorption rate is still the fundamental factor restricting the performance of the detector. So in our paper, the QDIP is improved by introducing the metal structure with the strips and holes to increase absorptivity. The results demonstrate that the enhanced QDIP can greatly improve the photon absorptivity up to 98.92% as a result of the local coupling surface plasmon effect, which is 1.23 times than that of the conventional photodetectors without the metal array structures. Keywords Quantum dot infrared photodetector . Surface plasmon . Metal
Introduction Quantum dot infrared photodetector (QDIP) is a kind of detector which adopts the novel quantum dot nanostructure [1–3]. It realizes the detection of the incident infrared light by the transition between inter-subbands, so it shows high photoconductive gain, big responsivity, and so on. However, it can be found that the QDIP is not perfect [4]; it has some negative factors, for example, the influence of the lattice mismatch of the materials and the limited number of the quantum dot stack. Hence, it is very necessary that the QDIP is optimized to make up for the degraded performance due to the negative factors above. Now, there are methods used to optimize the QDIP, which mainly includes the introducing of the metal grating [5] and the regulation of the barrier layer [6]. Let
* Hongmei Liu [email protected] * Guodong Wei [email protected] 1
Institute of Solid State Physics, Shanxi Datong University, Datong City 037009, People’s Republic of China
2
School of Physical Science and Electronics, Shanxi Datong University, Datong City 037009, People’s Republic of China
3
School of Science, Xi’an Shiyou University, Xi’an City 710065, People’s Republic of China
4
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun City 130012, People’s Republic of China
us compare these methods; it can be found that the method of the introducing of the metal grating is operated more complicatedly, but its optimization effect is more obvious, so many researchers tend to use this method to improve the performance of photodetector [7, 8]. More details, the Chang group combined the metal holes periodic array with the quantum dot layer in the QDIP in 2007 [9], which leads to the supernormal light transmission of the photodetector. In 2009, Lee et al. proposed a method for high detectivity QDIP by integrating metallic photonic crystals with 3.6 μm period of hole array (100 nm thickness) [10]. The research results demonstrate that the method can realize the peak response of the photode
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