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Light Management in Ultra-Thin Cu(In, Ga)Se2 Photovoltaic Devices
University of Ljubljana.
University of Ljubljana.
University of Ljubljana.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. (Avdelningen för Solcellsteknik)
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2019 (English)In: Proceedings of 36th European Photovoltaic Solar Energy Conference and Exhibition, 2019, p. 654-660, article id 3BV.1.9Conference paper, Published paper (Other academic)
Abstract [en]

Cu(In, Ga)Se2 (CIGS) solar cells exhibit high conversion efficiencies, with a recent record of 23.35 % on the cell level. However, an absorber thickness >1.8 m is required for efficient absorption of long-wavelength light. In order to minimize the material consumption (In, Ga and other elements) and to accelerate the fabrication process, further thinning down of CIGS absorber layer is important. One of the main challenges of ultra-thin absorber devices is to increase light absorption and consequently the photocurrent. We employ advanced optical simulations of ultra-thin (500 nm) CIGS devices in a PV module configuration, thus solar cell structure including encapsulation and front glass. Using simulations, we design and investigate different solutions for increased short circuit current, in particular (i) highly reflective back reflectors (BR), (ii) internal nano-textures and (iii) external textures by applying a light management foil. We show that any single solution (i, ii, iii) is not enough to compensate for the lower photocurrent, when thinning down (1800 nm -> 500 nm) the absorber layer. A combination of properly optimized internal or external textures and highly reflective back reflector is needed to reach, or even exceed (by ~3-5 %), the short circuit current of a standard thick (1800 nm) CIGS module structure.

Place, publisher, year, edition, pages
2019. p. 654-660, article id 3BV.1.9
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Electronics
Identifiers
URN: urn:nbn:se:uu:diva-401418DOI: 10.4229/EUPVSEC20192019-3BV.1.9ISBN: 3-936338-60-4 (electronic)OAI: oai:DiVA.org:uu-401418DiVA, id: diva2:1383363
Conference
36th European Photovoltaic Solar Energy Conference and Exhibition
Part of project
ARCIGS-M
Funder
EU, Horizon 2020, 720887Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-08

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Chen, Wei-ChaoEdoff, Marika

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