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Title: Module-level Cell Processing of Silicon Heterojunction Interdigitated Back-Contacted (SHJ-IBC) Solar Cells with Efficiencies above 22%: Towards All-Dry Processing
Authors: Radhakrishnan, Hariharsudan Sivaramakrishnan
Bearda, Twan
Xu, Menglei
Jonnak, Shashi Kiran
Malik, Shuja
Hasan, Mahmudul
Depauw, Valerie
Filipic, Miha
Van Nieuwenhuysen, Kris
Abdulraheem, Yaser
Debucquoy, Maarten
Gordon, Ivan
Szlufcik, Jozef
Issue Date: 2016
Publisher: IEEE
Source: 2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC), IEEE,p. 1182-1187
Series/Report: IEEE Photovoltaic Specialists Conference
Abstract: Module-level processing of silicon heterojunction interdigitated back-contacted (SHJ-IBC) solar cells while bonded to glass, in the so-called i2-module concept, is discussed. In this approach, a key challenge is the interdigitated patterning of aSi:H without compromising on the rear-surface passivation. Process adaptations involving more resistant bonding agents and a milder wet etchant enabled bonded cells with the best efficiency of 21.7% and VOC of 734 mV, which are the highest reported for bonded cells processed partially at module level, and which undoubtedly proves the potential of this i2-module concept to reach high Voc and efficiency. Yet another challenge is to make the process flow cost-effective and industrially-relevant, i.e. a lithofree, all-dry process flow, analogous to thin-film PV module fabrication. As a first step, dry etching of a-Si:H was developed to replace wet etching, and was successfully incorporated in a SHJIBC process flow to fabricate freestanding cells with the best efficiency of 22.9% and above 20% on thick (190 μm) and thin (56 μm) EVA-bonded silicon.
Notes: Radhakrishnan, HS (reprint author), IMEC, Leuven, Belgium.
Keywords: heterojunction solar cells; interdigitated backcontacted cells; amorphous silicon; charge carrier lifetime; surface passivation; module-level processing; bonding
Document URI:
ISBN: 9781509027248
DOI: 10.1109/PVSC.2016.7749801
ISI #: 000399818701042
Rights: ©2016 IEEE
Category: C1
Type: Proceedings Paper
Validations: ecoom 2018
Appears in Collections:Research publications

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