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Rear Optical Reflection and Passivation Using a Nanopatterned Metal/Dielectric Structure in Thin-Film Solar Cells
Int Iberian Nanotechnol Lab, P-4715330 Braga, Portugal.
Int Iberian Nanotechnol Lab, P-4715330 Braga, Portugal;Univ Aveiro, Dept Fis, Campus Univ Santiago, P-3810193 Aveiro, Portugal;Univ Aveiro, I3N, P-3810193 Aveiro, Portugal.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Int Iberian Nanotechnol Lab, P-4715330 Braga, Portugal.ORCID iD: 0000-0002-6449-3321
Int Iberian Nanotechnol Lab, P-4715330 Braga, Portugal.
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2019 (English)In: IEEE Journal of Photovoltaics, ISSN 2156-3381, E-ISSN 2156-3403, Vol. 9, no 5, p. 1421-1427Article in journal (Refereed) Published
Abstract [en]

Currently, one of the main limitations in ultrathin Cu(In,Ga)Se-2 (CIGS) solar cells are the optical losses, since the absorber layer is thinner than the light optical path. Hence, light management, including rear optical reflection, and light trapping is needed. In this paper, we focus on increasing the rear optical reflection. For this, a novel structure based on having a metal interlayer in between the Mo rear contact and the rear passivation layer is presented. In total, eight different metallic interlayers are compared. For the whole series, the passivation layer is aluminum oxide (Al2O3). The interlayers are used to enhance the reflectivity of the rear contact and thereby increasing the amount of light reflected back into the absorber. In order to understand the effects of the interlayer in the solar cell performance both from optical and/or electrical point of view, optical simulations were performed together with fabrication and electrical measurements. Optical simulations results are compared with current density-voltage (J-V) behavior and external quantum efficiency measurements. A detailed comparison between all the interlayers is done, in order to identify the material with the greatest potential to he used as a rear reflective layer for ultrathin CIGS solar cells and to establish fabrication challenges. The Ti-W alloy is a promising a rear reflective layer since it provides solar cells with light to power conversion efficiency values of 9.9%, which is 2.2% (abs) higher than the passivated ultrathin sample and 3.7% (abs) higher than the unpassivated ultrathin reference sample.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2019. Vol. 9, no 5, p. 1421-1427
Keywords [en]
Back/rear contact, Cu(In, Ga)Se-2 (CIGS), light trapping, optical simulation, thin-film solar cells
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-394055DOI: 10.1109/JPHOTOV.2019.2922323ISI: 000483015000034OAI: oai:DiVA.org:uu-394055DiVA, id: diva2:1357302
Funder
EU, Horizon 2020, 720887EU, Horizon 2020Available from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-10-03Bibliographically approved

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Bose, SouravDonzel-Gargand, OlivierHultqvist, AdamChen, Wei-ChaoEdoff, Marika

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Bose, SouravDonzel-Gargand, OlivierHultqvist, AdamChen, Wei-ChaoEdoff, Marika
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Solid State PhysicsApplied Materials SciencesSolid State Electronics
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IEEE Journal of Photovoltaics
Condensed Matter Physics

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