Acceso abierto

Investigating the effect of number of metal electrodes on performance parameters of AlGaN MSM photodetectors

Harpreet Kaur
Harpreet Kaur
, 
Harsimran Jit Kaur
Harsimran Jit Kaur
 y 
Manish Kumar Hooda
Manish Kumar Hooda
   | 14 sept 2022
International Journal on Smart Sensing and Intelligent Systems's Cover Image
Acerca de este artículo
Artículo anterior
Artículo siguiente
Cite
Article Category: Article
Publicado en línea: 14 sept 2022
Páginas: -
Recibido: 29 ene 2022
DOI: https://doi.org/10.2478/ijssis-2022-0015
Palabras clave
© 2022 Harpreet Kaur et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Structural diagram of AlGaN/AlN/Sapphire MSM detector with two metal electrodes (Enlarged view).
Structural diagram of AlGaN/AlN/Sapphire MSM detector with two metal electrodes (Enlarged view).

Figure 2

I–V characteristics plot of (S = W) MSM structure with 5-Fingers.
I–V characteristics plot of (S = W) MSM structure with 5-Fingers.

Figure 3

Dark current density vs number of fingers plot for (a) double spacing design and (b) Equal width and spacing design.
Dark current density vs number of fingers plot for (a) double spacing design and (b) Equal width and spacing design.

Figure 4

Photocurrent curve diagrams for (a) double spacing design (b) equal width and spacing design.
Photocurrent curve diagrams for (a) double spacing design (b) equal width and spacing design.

Figure 5

Dark current density plot for 5-Fingers based double spacing design.
Dark current density plot for 5-Fingers based double spacing design.

Electrode design parameters of MSM structures under investigation.

Type of MSM structures Detector area (μm2) Finger width (μm) Finger spacing (μm) Fill factor (Ratio of total active optical area to total surface area)
Equal finger width and spacing designs 2-Fingers 40 (39.9) 13.33 13.33 (S = W) 13.33/40 = 0.33
3-Fingers 40 8 8 (S = W) 16/40 = 0.40
4-Fingers ~40 (39.9) 5.71 5.71 (S = W) 17.13/40 = 0.43
5-Fingers ~40 (39.9) 4.44 4.44 (S = W) 17.76/40 = 0.44
14-Fingers ~40 (39.9) 1.48 1.48 (S = W) 19.24/40 = 0.48
Double finger spacing designs 2-Fingers 40 10.0 20.0 (S = 2W) 20/40 = 0.50
3-Fingers ~40 (39.9) 5.7 11.4 (S = 2W) 22.8/40 = 0.57
4-Fingers 40 4.0 8.0 (S = 2W) 24/40 = 0.60
5-Fingers ~40 (39.9) 3.07 6.14 (S = 2W) 24.56/40 = 0.61
6-Fingers 40 2.5 5.0 (S = 2W) 25/40 = 0.63
14-Fingers 40 1 2.0 (S = 2W) 26/40 = 0.65

Comparison of Present observations with existing MSM detectors.

Reference of Earlier work MSM detector Structure Photocurrent (A) using I–V characteristics plot Dark current density (A/cm2)
(Wang et al., 2013) Al0.4Ga0.6N/AlN/Sapphire With S = W = 7 μm and 28 fingers Around 3e-08 at 20 V 1e-11 at 20 V
(Gökkavas et al., 2007) Al0.6Ga0.4N/AlN/Sapphire With S = W = 4 μm and 25 fingers - 5.8 1e-10 at 50 V
Al0.5Ga0.5N/AlN/Sapphire With S = W = 3 μm and 16 fingers - 1.4 1e-10 at 50 V
(Xie et al., 2012) Al0.4Ga0.6N/AlN/Sapphire With S = W = 5 μm and 40 fingers 1e-08 at 20 V 1.25e-12 at 20 V
Present work Al0.5Ga0.5N/AlN/Sapphire Based on S = W with 4 fingers 1e-09 at 20 V 1e-10 at 20 V
Al0.5Ga0.5N/AlN/Sapphire Based on S = 2W with 5 fingers 10.725e-03 at 50 V 9.5e-11 at 50 V

Performance parameters of MSM structures under investigation.

Type of MSM structure Number of fingers Electrode dimensions Peak light current density at 50 V using 1 W/cm2 light intensity (A/cm2) Peak dark current density at 50 V (A/cm2) Photo to dark current density ratio (PDCDR)
Equal finger width and spacing designs (S = W) 2-Fingers W = S = 13.33 1e06 3.8e-10 3e15
3-Fingers W = S = 8.0 1.8e06 1.73e-10 1e16
4-Fingers W = S = 5.71 4.63e06 1.13e-10 4.1e16
5-Fingers W = S = 4.44 3.88e06 6.75e-10 6e15
6-Fingers W = S = 3.63 8e06 1.2e-10 6.6e16
Double finger spacing designs (S = 2W) 2-Fingers W = 10.0 S = 20.0 6.4e05 1.1e-10 5.8e15
3-Fingers W = 5.7 S = 11.4 1.2e06 2.2e-09 5e14
4-Fingers W = 4.0 S = 8.0 3.4e06 1.23e-10 2.7e16
5-Fingers W = 3.07 S = 6.14 2.6e06 9.5e-11 3e16
6-Fingers W = 2.5 S = 5.0 6.4e06 3.38e-10 1.9e16
eISSN:
1178-5608
Idioma:
Inglés
Calendario de la edición:
Volume Open
Temas de la revista:
Ingeniería, Introducciones y reseñas, otros
RSS Feed de revista