TY - GEN
T1 - Early Detection of Encapsulant Discoloration by UV Fluorescence Imaging and Yellowness Index Measurements
AU - Dolia, Kshitiz
AU - Sinha, Archana
AU - Tatapudi, Sai
AU - Oh, Jaewon
AU - Tamizh Mani, Govinda Samy
N1 - Funding Information:
This research work is supported by the Solar Energy Research Institute for India and the U.S. (SERIIUS), funded jointly by the U.S. Department of Energy (DOE) and the Government of India. This work is now continued under DOE-SunShot’s PREDICTS 2 program. The authors would like to acknowledge the help from Shashwata Chattopadhyay of Indian Institute of Technology Bombay in the procurement of materials and initial design of test coupons.
Publisher Copyright:
© 2018 IEEE.
PY - 2018/11/26
Y1 - 2018/11/26
N2 - The early detection of encapsulant discoloration in the indoor accelerated UV-stressed mini-modules were carried out using non-destructive methods, such as UV fluorescence (UVf) imaging, yellowness index (YI), and IV measurements. Eight labfabricated 9-cell mini-modules having glass/backsheet construction with two kinds of EVA, UV-cut EVA and UV-pass EVA, were experimented. Mini-modules with UV-cut EVA suffered from yellowing, which is clearly evident from UVf images and \DeltaYI (not to the naked eyes), whereas mini-modules with UV-pass EVA showed the signs of delamination above the cell area without any discoloration in the UVf images. Also, the activation energy for encapsulant discoloration was determined based on %I-{mathbf{sc}}drop\DeltaYI data.
AB - The early detection of encapsulant discoloration in the indoor accelerated UV-stressed mini-modules were carried out using non-destructive methods, such as UV fluorescence (UVf) imaging, yellowness index (YI), and IV measurements. Eight labfabricated 9-cell mini-modules having glass/backsheet construction with two kinds of EVA, UV-cut EVA and UV-pass EVA, were experimented. Mini-modules with UV-cut EVA suffered from yellowing, which is clearly evident from UVf images and \DeltaYI (not to the naked eyes), whereas mini-modules with UV-pass EVA showed the signs of delamination above the cell area without any discoloration in the UVf images. Also, the activation energy for encapsulant discoloration was determined based on %I-{mathbf{sc}}drop\DeltaYI data.
KW - UV fluorescence
KW - accelerated stress testing
KW - activation energy
KW - colorimetry
KW - delamination
KW - encapsulant discoloration
UR - http://www.scopus.com/inward/record.url?scp=85059918025&partnerID=8YFLogxK
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U2 - 10.1109/PVSC.2018.8547939
DO - 10.1109/PVSC.2018.8547939
M3 - Conference contribution
AN - SCOPUS:85059918025
T3 - 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
SP - 1267
EP - 1272
BT - 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018
Y2 - 10 June 2018 through 15 June 2018
ER -