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Power loss/gain characterization: Modules with multi-busbar, half-cut cells & light-trapping ribbon

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By Jai Prakash Singh, received his Ph.D. in electrical and computer engineering from NUS. He works as a research scientist with SERIS at NUS, and has more than 10 years’ experience in solar PV.; Yong Sheng Khoo, is the head of module development group at SERIS, and has more than five years’ experience in PV module development and testing.; Cai Yutian, received his B.Eng. (Hons) in materials science and engineering. He is currently a research engineer at SERIS, where his research focuses on the prototyping of PV modules; Srinath Nalluri, obtained his B.Eng. from NUS and has around three years’ experience in the PV industry.; Sven Kramer, studied management and engineering at the Cooperative University in Stuttgart, Germany.; Axel Riethmüller, studied mechanical engineering at the University of Stuttgart, Germany.; Yan Wang, is the director of the PV module cluster at SERIS, and has profes siona l knowledge of PV te chnolog y and hands-on manufacturing experience spanning various PV products.

To guarantee the long-term competitiveness of the PV industry, the cost of PV power generation ($/kWh) must be continuously reduced. Such reduction can be achieved in two ways: 1) by improving PV module performance (efficiency, annual energy yield, reliability); 2) by reducing manufacturing costs ($/Wp).

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As always we have a selection of technical papers from some of the industry’s leading minds. Radovan Kopecek and Joris Libal from ISC Konstanz tackle one of the biggest issues impeding the rollout of bifacial cell and modules, how to standardise their measurement. As long as there is no commercially available means to measure their gain, bifacial modules will struggle to improve their market penetration. The materials section includes an excellent paper from Fraunhofer THM examining the optimization of diamond wire sawing. The method is becoming increasingly predominant with some equipment manufacturers shelving their slurrybased tools. Here Fraunhofer assesses how to squeeze even more efficiency out of diamond wire saws. CSEM meanwhile explores the required metallization and interconnection process changes required to enable a production-scale shift to silicon heterojunction PV. Mark Osborne provides his latest capacity expansion report as upgrades to higher efficiency lines continue to drive planned investments.

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