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Seongwook Choi

1-1-3 Project Director

  • Affiliation SNU (Electrical and Computer Engineering)
  • Tel +82-2-880-7285
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  • Research TopicDevelopment of Optical Sensory System for IoT Applications, Research on Biosensor and Water Quality Sensor, Development of TCAD Model for Semiconductor Device Physics and Reliability
Project : Development of a ultra-small and high sensitive optical sensor system
Purpose The purpose is to develop a real time water sensor system by utilizing an array of light emitting diodes (LED) and photodiodes (PD). The wavelengths of LED are chosen in the range from the ultraviolet(>250nm) to the infrared (<1000nm). For achieving a record-high sensitivity with a ultra-small size sensor, the optical feedback method will be applied to the sensor system.
In addition, the possibility of a Silicon infrared (IR) photodiode will be investigated. The performance target of the Si IR sensor is similar or higher level than that of the conventional IR sensors with non-Silicon materials such as Ge.
Contents <Development of Water Quality Sensor System>
□ Ultra-sensitive water sensor with optical feedback method using the LED-PD array:
Based on the theoretical modeling and experimental justifications, the optical feedback system with a transmitted and scattered light will be optimized.
□ Detection of multi-pollutants in the water
The sensor is composed of more than 4 LEDs to detect multi-pollutants (e.g. protein, microorganisms, toxic chemicals, turbidity).
□ Design of a smart water sensor chip for the IoT applications
We will design the sensor chip in which the multi-cahnnel LED-PD sensor driver is integrated with the optical feedback method.
□ Developemnt of engineering and customer samples for business
The engineering and customer samples are produced and it will be applied to the test-bed and the business.

<Infrared Sensor with Si device>
□ Investigation on the Si IR sensor (wavelength of 1~2um)
For the IR sensing in the Si devices, the zener junction of PN diode and MOSFET source/drain junction in the GIDL regime will be utilized.
Expected Contribution The final goal is to develope the ultra-small and high sensitive optical sensor technology. This technology can be applied not only to the water pollution detections, but also to the bio experiments which require a precise optical sensing. The water sensor technology and the developed samples can be merged with IoT technologies to enable the smart water grid system. In the way, the optical sensor method can serve as a disruptive technology for the future water industries.
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