Improvement in the Power of Shingled-Type Photovoltaic Module by Control of the Overlapped Width
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Improvement in the Power of Shingled-Type Photovoltaic Module by Control of the Overlapped Width Min-Joon Park, Jinho Song, Daehan Moon and Chaehwan Jeong∗ Smart Energy & Nano R&D Group, Korea Institute of industrial Technology, Gwangju 61012, Korea
Hongsub Jee Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea (Received 27 May 2020; revised 5 June 2020; accepted 11 June 2020) Shingled string photovoltaic (PV) cells have a larger active area, and they significantly reduced damage from the interconnection process using electrically conductive adhesives. This new method using a shingled design provides increased PV module power compared with the conventional PV module for the same installed area. In this work, we study the optimization of shingled string PV cells for high-power shingled design modules (SDMs). To successfully fabricate shingled string PV cells and high-power SDMs, we adjusted the overlap width between solar cells and achieve conversion powers of 406.5 W for a 1100 mm × 1980 mm area. Finally, we perform a reliability tests to verify the durability of our SDMs. Keywords: Shingled string, Silicon solar cells, Photovoltaic modules, High- density modules, Electrically conductive adhesive DOI: 10.3938/jkps.77.1040
I. INTRODUCTION The photovoltaics (PV) market is dominated by crystalline silicon (c-Si) technology and aims at improving the conversion power and lowering costs [1–4]. However, without further improvement of the cell and the module efficiency, the potential for future reductions in the module cost per watt and the total installed system cost is limited. To realize a high-power generated PV module system, Dickson et al. introduced a shingled string of solar cells in 1960 [5]. The shingled design modules, which are in the spotlight for high-power generated PV systems have two advantages over conventional Si PV modules. First, the shingled string device has a large active area compared with the conventional PV system. An array of serially connected cells does not have a busbar electrode on the top of the PV cells. Generally, the power loss in a PV module system is mainly because of a decrease in the current density. This new method using a shingled design increases the module power for the same installed area an used in conventional modules [6–8]. Second, we connected each other cells by using electrically conductive adhesive (ECA) instead of metallic wire connections [9,10]. The thermo-mechanical balance between the cell and the interconnectors, i.e., the metallic wire connec∗ E-mail:
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pISSN:0374-4884/eISSN:1976-8524
tion, results in stress [11,12]. When the ECA cell connection is used instead of the metallic wire, the damage from the interconnection process is reduced significantly. Moreover, direct interconnection between the top and the bottom of cells with ECA improves the fill factor because of a reduction in the series resistance [13]. In our previous work, we studied the ECA characteristics for shingled string cells and the relati
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