Discovery of Type II Interlayer Trions

Linglong Zhang; Fei Zhou; Xiaowei Zhang; Shunshun Yang; Bo Wen; Han Yan; Tanju Yildirim; Xiaoying Song; Qi Yang; Ming Tian; Neng Wan; Hucheng Song; Jiajie Pei; Shuchao Qin; Jiaqi Zhu; S Wageh; Omar A Al-Hartomy; Abdullah G Al-Sehemi; Haoliang Shen; Youwen Liu; Han Zhang

doi:10.1002/adma.202206212

Discovery of Type II Interlayer Trions

Adv Mater. 2023 Feb;35(5):e2206212. doi: 10.1002/adma.202206212. Epub 2022 Dec 19.

Authors

Linglong Zhang¹, Fei Zhou², Xiaowei Zhang³, Shunshun Yang¹, Bo Wen⁴, Han Yan⁵, Tanju Yildirim⁶, Xiaoying Song⁷, Qi Yang⁸, Ming Tian⁹, Neng Wan⁹, Hucheng Song¹⁰, Jiajie Pei¹¹, Shuchao Qin¹², Jiaqi Zhu⁸, S Wageh¹³, Omar A Al-Hartomy¹³, Abdullah G Al-Sehemi¹⁴, Haoliang Shen¹⁵, Youwen Liu¹, Han Zhang⁸

Affiliations

¹ College of Physics, Nanjing University of Aeronautics and Astronautics, Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT, Nanjing, 211106, China.
² State Key Laboratory for Environment-friendly Energy Materials, School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China.
³ Department of Electrical Engineering and Computer Science, Ningbo University, Ningbo, 315211, China.
⁴ Institute of Nanosurface Science and Engineering, Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, Shenzhen University, Shenzhen, 518060, China.
⁵ Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
⁶ Center for Functional Sensor & Actuator (CFSN), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan.
⁷ College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.
⁸ Intstitue of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.
⁹ SEU-FEI Nano Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronics Science and Engineering, Southeast University, Nanjing, 210096, China.
¹⁰ Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures/Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
¹¹ College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China.
¹² Key Laboratory of Optical Communication Science and Technology of Shandong Province, School of Physical Science and Information Engineering, Liaocheng University, Liaocheng, 252059, China.
¹³ Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
¹⁴ Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia.
¹⁵ Suzhou Laboratory, Suzhou, 215123, China.

PMID: 36373507
DOI: 10.1002/adma.202206212

Abstract

In terms of interlayer trions, electronic excitations in van der Waals heterostructures (vdWHs) can be classified into Type I (i.e., two identical charges in the same layer) and Type II (i.e., two identical charges in the different layers). Type I interlayer trions are investigated theoretically and experimentally. By contrast, Type II interlayer trions remain elusive in vdWHs, due to inadequate free charges, unsuitable band alignment, reduced Coulomb interactions, poor interface quality, etc. Here, the first observation of Type II interlayer trions is reported by exploring band alignments and choosing an atomically thin organic-inorganic system-monolayer WSe₂ /bilayer pentacene heterostructure (1L + 2L HS). Both positive and negative Type II interlayer trions are electrically tuned and observed via PL spectroscopy. In particular, Type II interlayer trions exhibit in-plane anisotropic emission, possibly caused by their unique spatial structure and anisotropic charge interactions, which is highly correlated with the transition dipole moment of pentacene. The results pave the way to develop excitonic devices and all-optical circuits using atomically thin organic-inorganic bilayers.

Keywords: Coulomb interactions; anisotropic emission; atomically thin organic-inorganic heterostructures; positive and negative trions; type II interlayer trions.

Abstract

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