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Optical response of WSe2-based vertical tunneling junction

Version 1.0

Molas, Maciej; Zawadzka, Natalia; Walczyk, Kacper; Krasucki, Grzegorz; Olkowska-Pucko, Katarzyna; Chen, Zhaolong; Taniguchi, Takashi; Watanabe, Kenji; Babiński, Adam; Koperski, Maciej, 2024, "Optical response of WSe2-based vertical tunneling junction", https://doi.org/10.58132/UIIZRV, Dane Badawcze UW, V1

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Description

Layered materials have attracted significant interest because of their unique properties. Van derWaals heterostructures based on transition-metal dichalcogenides have been extensively studied because of potential optoelectronic applications. We investigate the optical response of a light-emitting tunneling structure based on a WSe2 monolayer as an active emission material using the photoluminescence (PL) and electroluminescence (EL) experiments performed at low temperature of 5 K. We found that the application of the bias voltage allows us to change both a sign and a value of free carriers concentrations. Consequently, we address the several excitonic complexes emerging in PL spectra under applied bias voltage. The EL signal was also detected and ascribed to the emission in a high-carrier-concentration regime. The results show that the excitation mechanisms in the PL and EL are different, resulting in various emissions in both types of experimental techniques.

(2024-11-18)
Subject
Physics
Keyword

electroluminescence, photoluminescence, exciton, monolayer

CC BY - Creative Commons Attribution 4.0 CC BY - Creative Commons Attribution 4.0

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fig_2_a.txt
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MD5: 68271f6e71c2473bc01332c43a9120d7
License: CC BY - Creative Commons Attribution 4.0
Figure 2(a). Electroluminescence spectrum of WSe2 as a function of applied bias voltage at 5 K. The data is in matrix format (41 x 401). First row is Bias Voltage (V) and first column is Energy (eV).
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fig_2_b.txt
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MD5: 785c52259c9fe1414bc1e48c141eba9c
License: CC BY - Creative Commons Attribution 4.0
Figure 2(b). Photoluminescence spectrum of WSe2 as a function of applied bias voltage at 5 K. The data is in matrix format (25 x 1339). First row is Bias Voltage (V) and first column is Energy (eV).
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fig_2_c.txt
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MD5: 17de8eb119ee1b740874ac6c97917cc7
License: CC BY - Creative Commons Attribution 4.0
Figure 2(c). Electroluminescence spectrum of WSe2 as a function of applied bias voltage at 5 K. The data is in matrix format (41 x 1339). First row is Bias Voltage (V) and first column is Energy (eV).
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fig_3.txt
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MD5: e32f83e0f2437068e7bc80f94d5c5adf
License: CC BY - Creative Commons Attribution 4.0
Figure 3). The data is composed of six columns: 1. Energy (eV); 2. Electroluminescence spectra at - 4.5 V; 3. Photoluminescence spectra at - 0.74 V; 4. Photoluminescence spectra at 0 V; 5. Photoluminescence spectra at 1.04 V; 6. Photoluminescence spectra at 2.14 V; 7. Electroluminescence spectra at 4.5 V;
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Integrated_EL_intensity.txt
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MD5: 9f12817f88badbd1e38682d7ff6ce91a
License: CC BY - Creative Commons Attribution 4.0
Figure 4, green curve. Integrated intensity of Electroluminescence spectrum as a function of applied bias voltage. In first column is Voltage (V), in second is Integrated Electroluminescence intensity (a. u.).
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IV_curve.txt
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MD5: 6fd8af756105b8c419c7237a61783ad9
License: CC BY - Creative Commons Attribution 4.0
Figure 4, black curve. Tunneling current as a function of applied bias voltage. In first column is Voltage (V), in second is Tunneling current (uA).
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