Sustained robust exciton emission in suspended monolayer WSe2 within the low carrier density regime for quantum emitter applications

Author:

Chen Zheng-Zhe123ORCID,Chang Chiao-Yun4ORCID,Tsai Ya-Ting15ORCID,Tsai Po-Cheng16ORCID,Lin Shih-Yen16ORCID,Shih Min-Hsiung157ORCID

Affiliation:

1. Research Center for Applied Sciences, Academia Sinica 1 , Taipei 11529, Taiwan

2. Department of Physics, National Taiwan University 2 , Taipei 10617, Taiwan

3. Institute of Physics, Academia Sinica 3 , Taipei 11529, Taiwan

4. Department of Electrical Engineering, National Taiwan Ocean University 4 , Keelung 20224, Taiwan

5. Department of Photonics and Institute of Electro-Optical Engineering, National Yang Ming Chiao Tung University 5 , Hsinchu 30010, Taiwan

6. Graduate Institute of Electronics Engineering, National Taiwan University 6 , Taipei 10617, Taiwan

7. Department of Photonics, National Sun Yat-sen University 7 , Kaohsiung 80424, Taiwan

Abstract

The development of semiconductor optoelectronic devices is moving toward low power consumption and miniaturization, especially for high-efficiency quantum emitters. However, most of these quantum sources work at low carrier density regions, where the Shockley–Read–Hall (SRH) recombination may be dominant and seriously reduce the emission efficiency. In order to reduce the effect of carrier trapping and sustain a strong photoluminescence (PL) emission under low power pumping conditions, we investigated the influence of “suspending” a monolayer of tungsten diselenide (WSe2), a novel two-dimensional quantum material. Not only the PL intensity but also the fundamental photoluminescence quantum yield (PLQY) has exhibited a huge, order-scale enhancement through suspending; even surprisingly, we found the PLQY improvement to be far significant under small pumping powers and observed an exponential increase in tendency toward an even lower carrier density region. With its strong excitonic effect, suspended WSe2 offers a solution to reduce carrier trapping and participate in non-radiative processes. Moreover, in the low-power range, where SRH recombination dominates, suspended WSe2 exhibited a remarkably higher percentage of excitonic radiation compared to contacted WSe2. Herein, we quantitatively demonstrate the significance of the suspended WSe2 monolayer in a low carrier density region, highlighting its potential for developing compact, low-power quantum emitters in the future.

Publisher

AIP Publishing

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3