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Back Contact Heterojunction Solar Cells Patterned by Laser Ablation.pdf
Available online at
ScienceDirect
Energy Procedia 92 (2016) 730 – 737
6th International Conference on Silicon Photovoltaics, SiliconPV 2016
Back contact heterojunction solar cells patterned by laser ablation
Samuel Harrisona, Oriol Nosa, Guillaume D’Alonzoa, Christine Denisa, Arnau Collb, Delfina Munoza
aCEA-INES, 50 avenue du lac Léman, 73375 Le Bourget du Lac, France bDepartament d’Enginyeria Electronica, Universitat Politecnica de Catalunya, C/Jordi Girona 1-3, Modul C4, 08034 Barcelona, Spain
Abstract Back contact heterojunction (IBC-HIT) solar cells is one of the most promising technology for the upcoming generations of high efficiency crystalline-Silicon (c-Si) based photovoltaic modules [1]. However, the industrialization of the IBC-HIT technology is actually constrained by the complexity of the back side cell processing, which usually involves costly and time consuming photolithography steps. CEA-INES is currently developing a method based only on laser ablation for the structuration of IBCHIT solar cells [2]. Laser ablation is indeed a fast and low cost technique that also allows the patterning of the back side amorphous (a-Si:H) layers on large area IBC-HIT solar cells. However laser irradiation might induce some damage at the c-Si/aSi:H interface thus limiting the final performance of the devices. In this work, we compare the results obtained with our laser patterning process for different stack configurations and laser ablation conditions (532 nm and 355 nm). We will also discuss about the criteria used for the choice of the different materials and the laser ablation conditions needed in order to successfully pattern both the emitter and BSF (Back Surface Field) regions of the cell. Our best cell efficiency achieved up to now is 20.55% on an area of 18.11 cm2. ?TheheAAutuhtohros.rPs.uPbluisbhliesdhbeyd EblyseEvliseervLitedr. LTthdi.s is an open access article under the CC BY-NC-ND license (Phettepr:/r/cerveiaetwivebcyomthmeosncsi.eonrtgi/fliic
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