Quadrant Photodetector - DDA-I

In addition to information security and electronics system projects, the Scientific and Technological Research Council of Turkey (TÜBİTAK)Informatics and Information Security Research Center (Bilgem), National Research Institute of Electronics and Cryptology (UEKAE) has interest in the photo-detector sensors and systems. The quadrant photo-detector designed and fabricated entirely by UEKAE has several applications in both military and public services. 

PIN photo-detector (DDA-I) fabrication process was developed by Semiconductor Technologies Research Lab (YITAL) in accordance with the specifications provided by Roketsan These DDA-I sensors developed specifically for Roketsan’s laser-guided missile -CIRIT- have four parallel PIN-diodes on the same silicon substrate.

DDA-I has an active area diameter of more than 10 millimeters, very low dark current (<1nA/cm2), and higher impulse responsivity (0,44A/W) compared to commercially available sensors in its class. These detectors offer low capacitance per quadrant, wide dynamic range, high breakdown voltage, fast response and accuracy compared to similar products on the market. 

Semiconductor Technologies Research Lab (YITAL) specialize in designing and fabricating semiconductor components such as these quadrant photo-detectors that require advanced technology and an innovative approach.

Fabrication process of the photo-detectors start with the device simulation and mask-layout using computer-aided design tools. Using the lay-outs, a set of photo-masks are produced to be used during the lithography steps of the fabrication. Next steps include the fabrication of the detectors, wafer testing, die preparation, packaging, and electrical and optical performance tests, respectively. Moreover, detector fabrication steps include wafer cleaning, oxidation, deposition, photolithography, dry/wet etching, ion implantation, and metallization. All of these steps from design to packaging and testing are completed using the resources & facilities of YITAL.

Various other photo-detector process development projects for several different applications are currently ongoing within YITAL.

Some of the applications of these photodetectors in several military and public areas are listed below:

Pulse Detectors

Optical Communications

Bar Code Readers

Optical Remote Control

Medical Equipments

High Speed Photometry