Electroluminescence and Photocurrent Generation from Atomically Sharp WSe2/MoS2 Heterojunction p–n Diodes
By Rui Cheng, Dehui Li, Hailong Zhou, Chen Wang, Anxiang Yin, Shanjuan Jiang, Yuan Liu, Yu Chen, Yu Huang, Xiangfeng Duan. Nano letters (Print), 2014
1,027 citations recorded by the source corpus.
The p–n diodes represent the most fundamental device building blocks for diverse optoelectronic functions, but are difficult to achieve in atomically thin transition metal dichalcogenides (TMDs) due to the challenges in selectively doping them into p- or n-type semiconductors. Here, we demonstrate that an atomically thin and sharp heterojunction p–n diode can be created by vertically stacking p-type monolayer tungsten diselenide (WSe2) and n-type few-layer molybdenum disulfide (MoS2). Electrical measurements of the vertically staked WSe2/MoS2 heterojunctions reveal excellent current rectification behavior with an ideality factor of 1.2. Photocurrent mapping shows rapid photoresponse over the entire overlapping region with a highest external quantum efficiency up to 12%. Electroluminescence studies show prominent band edge excitonic emission and strikingly enhanced hot-electron luminescence. A systematic investigation shows distinct layer-number dependent emission characteristics and reveals important insight about the origin of hot-electron luminescence and the nature of electron–orbital interaction in TMDs. We believe that these atomically thin heterojunction p–n diodes represent an interesting system for probing the fundamental electro-optical properties in TMDs and can open up a new pathway to novel optoelectronic devices such as atomically thin photodetectors, photovoltaics, as well as spin- and valley-polarized light emitting diodes, on-chip lasers.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7004da4677a835b445a57d5eb5d0d8572d5615ee
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In Materials Chemistry
- A. Castellanos-Gómez
- K. Novoselov
- Thomas Mueller
- W. Yao
- Fengnian Xia
- Xiaodong Xu
- A. C. Castro Neto
- E. Malic
Citations in the corpus
- Micro-reflectance and transmittance spectroscopy: a versatile and powerful tool to characterize 2D materials (2016, background): “[25], hydrothermal exfoliation [26], liquid exfoliation [27–29], and physical vapor deposition [30, 31].”
- Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors (2018, background): “It has been shown that heterostructures composed of MoS2 and WSe2 form a type-II heterojunction [39-41], with the lowest-energy conduction band states in the MoS2 layer and the highest-energy valence band states in WSe2.”