A research team of the College of Information and Communication Engineering at SKKU discovered an energy defect in CulnGaSeS structure of a solar battery and three-dimensionally (3D) visualized the defect in shape and distribution.
There have been many studies on the impact of the defect on solar batteries and its efficiency, but it was not easy to investigate due to the lack of measurement methods. This research provides a fascinating route to discover distinct types of defects (acceptor or donor) that can affect the efficiency of solar batteries, by analyzing microdefects quantitatively with DLTS methods and visualizing with various depths in the stage of absorption. Prof. CHOI explains that “This technology will contribute to an increase in reliability and to improve the life cycle of cells related to semiconductor memory, solar batteries, and display.” The study was led by Sung HUR, Ph.D., and Prof. Byoung Deog CHOI from the College of Information and Communication Engineering in SKKU, and Dong Ho LEE, Ph.D., from Samsung SDS, while Prof. Hun Young CHOI from Dongguk University and Prof. Hee Jae KANG from Chungbuk National University also participated. The main title of the research is “Defect Visualization of Cu(InGa)(SeS)2 Thin films using DLTS Measurements” and it was published in the Science Report August edition.

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