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Your search keyword '"Kim, Seongtak"' showing total 15 results
Start Over Author "Kim, Seongtak" Publisher elsevier b.v.
15 results on '"Kim, Seongtak"'

14. The degradation of multi-crystalline silicon solar cells after damp heat tests.

Author

Oh, Wonwook, Kim, Seongtak, Bae, Soohyun, Park, Nochang, Kang, Yoonmook, Lee, Hae-Seok, and Kim, Donghwan

Subjects
*SILICON solar cells, *METAL crystals, *HUMIDITY, *RESISTANCE heating, *PHOTOVOLTAIC cells, *SILICON wafers, *ELECTRIC circuits
Abstract

Lower performance of multi-crystalline silicon solar cells is usually observed after long-term damp heat test at 85 °C/85% relative humidity. Performance degradation is known to result from the loss in fill factor (FF) due to high series resistance. The causes of the increase in the series resistance are the reduction of the photovoltaic (PV) ribbon in the solder joint and the oxidation of surface on the front Ag finger by high thermal and moisture stress. Additionally, severe degradation by FF loss after damp heat originated from the contact resistance between Si and Ag fingers. Ag crystallites on Si wafer and bulk Ag at the edge of the Ag finger were partially oxidized and could not play a role in the current path of photo-generated electrons. [ABSTRACT FROM AUTHOR]

Published
2014
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15. Analysis of degradation in 25-year-old field-aged crystalline silicon solar cells.

Author

Oh, Wonwook, Bae, Soohyun, Kim, Seongtak, Park, Nochang, Chan, Sung-Il, Choi, Hoonjoo, Hwang, Heon, and Kim, Donghwan

Subjects
*SILICON solar cells, *SOLAR cells, *SHORT circuits, *CELL anatomy
Abstract

Photovoltaic (PV) modules have been in use for more than 25 years. The gradual degradation of PV modules is determined by its components and the solar cells. We analyzed the long-term reliability of solar cells using a 25-year-old field-aged PV module. The power of a large size PV module was reduced by approximately 24.6% owing to the delamination of two specific solar cell portions. For a single cell module from a large size PV module, the decrease of short circuit current (I sc) was caused by the discoloration of the ethylene-vinyl acetate. The maximum power (P max) decreased by 11.5% compared with its initial value; however, this is not an effect of the degradation of the solar cell. Despite being manufactured in the 1980s, these solar cells did not fail and have little power loss and excellent durability after 25 years. • PV modules installed and operated for 25 years were collected, and the characteristics of normal modules and solar cells were analyzed. • module had a power loss of 11.5%; however, the solar cell showed almost no power change. • The solar cell sample shows high quality despite 25 years of field exposure. [ABSTRACT FROM AUTHOR]

Published
2019
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