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25 results on '"Oh, Wonwook"'

20. Investigation of damage caused by partial shading of CuInxGa(1-x)Se2photovoltaic modules with bypass diodes

Author

Lee, Ji Eun, primary, Bae, Soohyun, additional, Oh, Wonwook, additional, Park, Hyomin, additional, Kim, Soo Min, additional, Lee, Dongho, additional, Nam, Junggyu, additional, Mo, Chan Bin, additional, Kim, Dongseop, additional, Yang, JungYup, additional, Kang, Yoonmook, additional, Lee, Hae-seok, additional, and Kim, Donghwan, additional

Published
2016
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23. Potential induced degradation of n-type crystalline silicon solar cells with p+ front junction.

Author

Bae, Soohyun, Oh, Wonwook, Lee, Kyung Dong, Kim, Seongtak, Kim, Hyunho, Park, Nochang, Chan, Sung‐Il, Park, Sungeun, Kang, Yoonmook, Lee, Hae‐Seok, and Kim, Donghwan

Subjects
*SOLAR cell efficiency, *PID controllers, *P-type semiconductors, *N-type semiconductors, *ELECTROLUMINESCENCE
Abstract

N-type silicon-based solar cells are currently being used for achieving high efficiency. However, most of the photovoltaic modules already constructed are based on p-type silicon solar cells, and there are few studies on potential induced degradation ( PID) in n-type solar cells. In this study, we investigated PID in n-type silicon solar cells with a front p+ emitter. Further, the PID characteristics of n-type solar cells are compared with those of p-type solar cells. The electrical properties of PID in solar cells are observed with the light I-V, quantum efficiency ( QE), and electroluminescence ( EL). The possible causes for the change in the external quantum efficiency ( EQE) after PID are interpreted using PC1D and are discussed by comparing the experimental results with the simulation results. [ABSTRACT FROM AUTHOR]

Published
2017
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25. Investigation of damage caused by partial shading of CuInxGa(1-x)Se2 photovoltaic modules with bypass diodes.

Author

Lee, Ji Eun, Bae, Soohyun, Oh, Wonwook, Park, Hyomin, Kim, Soo Min, Lee, Dongho, Nam, Junggyu, Mo, Chan Bin, Kim, Dongseop, Yang, JungYup, Kang, Yoonmook, Lee, Hae‐seok, and Kim, Donghwan

Subjects
SOLAR cells, PHOTOVOLTAIC power generation, DIODES, CADMIUM sulfide, BUFFER solutions, MAINTENANCE
Abstract

This study evaluated the impact of partial shading on CuInxGa(1-x)Se2 (CIGS) photovoltaic (PV) modules equipped with bypass diodes. When the CIGS PV modules were partially shaded, they were subjected to partial reverse bias, leading to the formation of hotspots and a possible occurrence of junction damage. In a module with a cadmium sulfide buffer layer, hotspots and wormlike defects were formed. The hotspots were formed as soon as the modules were shaded; the hotspots caused permanent damage (wormlike defects) in the CIGS module. Specifically, the wormlike defects were caused by the window layer, leading to increased recombination and decay of the solar cell properties. However, a CIGS module with a zinc sulfide buffer layer did not exhibit the formation of hotspots or any visual damage. The reverse bias breakdown voltage of the CIGS PV module with the cadmium sulfide buffer layer was higher than that of the CIGS PV module with the zinc sulfide buffer layer. Copyright © 2016 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2016
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