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http://dx.doi.org/10.6117/kmeps.2020.27.4.055

A Study of Moth-eye Nano Structure Embedded Optical Film with Mitigated Output Power Loss in PERC Photovoltaic Modules  

Oh, Kyoung-suk (New & Renewable Energy Research Center, Korea Electronics Technology Institute)
Park, Jiwon (New & Renewable Energy Research Center, Korea Electronics Technology Institute)
Choi, Jin-Young (Nanomecca)
Chan, Sung-il (New & Renewable Energy Research Center, Korea Electronics Technology Institute)
Publication Information
Journal of the Microelectronics and Packaging Society / v.27, no.4, 2020 , pp. 55-60 More about this Journal
Abstract
The PERC photovoltaic (PV) modules installed in PV power plant are still reports potential-induced degradation (PID) degradation due to high voltage potential differences. This is because Na+ ions in the cover glass of PV modules go through the encapsulant (EVA) and transferred to the surface of solar cells. As positive charges are accumulated at the ARC (SiOx/SiNx) interface where many defects are distributed, shunt-resistance (Rsh) is reduced. As a result, the leakage current is increased, and decrease in solar cell's power output. In this study, to prevent of this phenomenon, a Moth-eye nanostructure was deposited on the rear surface of an optical film using Nano-Imprint Lithography method, and a solar mini-module was constructed by inserting it between the cover glass and the EVA. To analyze the PID phenomenon, a cell-level PID acceleration test based on IEC 62804-1 standard was conducted. Also analyzed power output (Pmax), efficiency, and shunt resistance through Light I-V and Dark I-V. As a result, conventional solar cells were decreased by 6.3% from the initial efficiency of 19.76%, but the improved solar cells with the Moth-eye nanostructured optical film only decreased 0.6%, thereby preventing the PID phenomenon. As of Moth-eye nanostructured optical film, the transmittance was improved by 4%, and the solar module output was improved by 2.5%.
Keywords
Nano imprint lithography; Moth-eye structure; PERC solar Cell; Conversion Efficiency; Potential-induced degradation;
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