Low dark current diffusion limited planar type InGaAs photodetectors

m halit, dolaş
ateşal, okan
çalışkan, m deniz
Bek, Alpan
In this work, we design and produce 1280x1024 format InGaAs based planar type detectors with 15µm pixel pitch. We have obtained diffusion current limited low dark current (~10fA) and high responsivity (1.08A/W at 1.55µm) values at room temperature conditions. Moreover, dark current modeling is performed using diffusion, generation & recombination (GR) and trap assisted tunneling (TAT) current mechanisms. Ideality factor is extracted from forward bias characteristics. Excellent match between modeling and experimental data is reached. Also, temperature dependency of dark current is studied in 10oC – 60oC ranges. The area and perimeter related dark current components are differentiated using test detectors with changing diameters that are placed next to the detector array structure. Experimental data shows good agreement with theoretical expectations.


Dark current optimization designs for mesa and planar type processed short wavelength infrared photodetectors
Dolaş, Muhammet Halit; Bek, Alpan; Arslan, Yetkin; Department of Micro and Nanotechnology (2021-3-05)
This thesis aims to report novel designs to achieve lower dark current values for modified pin heterojunction InGaAs/InP SWIR photodiodes for both mesa and planar type production methodologies.Mesa type studies covernovel passivation methodology based on a fully depleted thin p-InP layer. Mesastructured detectors are targeted due to their competitive advantages for applications such as multicolor/hyperspectral imaging. Test detector pixels with different p...
Large bandwidth mode order converter by differential waveguides
Oner, B. B.; ÜSTÜN, KADİR; Kurt, H.; Okyay, A. K.; Sayan, Gönül (The Optical Society, 2015-02-09)
In this article, we propose a large bandwidth mode-order converter design by dielectric waveguides with equal lengths but different cross-sectional areas. The efficient conversion between even and odd modes is verified by inducing required phase difference between the equal length waveguides of different widths. Y-junctions are composed of both tapered mode splitter and combiner to connect mono-mode waveguide to multi-mode waveguide. The converted mode profiles at the output port show that the device operat...
Large-format voltage-tunable dual-band quantum-well infrared photodetector focal plane array for third-generation thermal imagers
Eker, S. U.; Kaldirim, M.; Arslan, Y.; Beşikci, Cengiz (Institute of Electrical and Electronics Engineers (IEEE), 2008-10-01)
We report a large-format (640 x 512) voltage-tunable quantum-well (QW) infrared photodetector focal plane array (FPA) for dual-band imaging in the mid- and long-wavelength infrared (MWIR and LWIR) bands. Voltage-tunable spectral response has been achieved through a series connection of eight-well MWIR AlGaAs-InGaAs and 16-well LWIR AlGaAs-GaAs QW stacks grown by molecular beam epitaxy on GaAs substrate. The peak responsivity wavelength of the detectors is shifted from 4.8 to 8.4 mu m as the bias is increase...
640 x 512 Extended Short Wavelength Infrared In0.83Ga0.17As Focal Plane Array
Arslan, Yetkin; Oguz, Fikri; Beşikci, Cengiz (2014-12-01)
We present the detailed characteristics of solid source molecular beam epitaxy (MBE) grown large format (640 x 512) extended short wavelength infrared In0.83Ga0.17As sensor with desirable performance at both pixel and focal plane array (FPA) levels. The FPA pixels in the mesa structure grown on a graded AlInAs buffer layer with 2.65-mu m, 300-K cutoff wavelength exhibited 300- and 200-K peak detectivities as high as similar to 2.5 x 10(10) and similar to 1 x 10(12) cmHz(1/2)/W, which are both equivalent to ...
MT6415CA: A 640x512-15 mu m CTIA ROIC for SWIR InGaAs Detector Arrays
Eminoglu, Selim; Isikhan, Murat; Bayhan, Nusret; Gulden, M. Ali; Incedere, O. Samet; Soyer, S. Tuncer; Kocak, Serhat; Yilmaz, Gokhan S.; Akın, Tayfun (2013-05-03)
This paper reports the development of a new low-noise CTIA ROIC (MT6415CA) suitable for SWIR InGaAs detector arrays for low-light imaging applications. MT6415CA is the second product in the MT6400 series ROICs from Mikro-Tasarim Ltd., which is a fabless IC design house specialized in the development of monolithic imaging sensors and ROICs for hybrid imaging sensors. MT6415CA is a low-noise snapshot CTIA ROIC, has a format of 640 x 512 and pixel pitch of 15 mu m, and has been developed with the system-on-chi...
Citation Formats
d. m halit, o. ateşal, m. d. çalışkan, A. Bek, and E. ÖZBAY, “Low dark current diffusion limited planar type InGaAs photodetectors,” 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36965.