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Light management design in ultra-thin chalcopyrite photovoltaic devices by employing optical modelling
Univ Ljubljana, Fac Elect Engn, Trzaska 25, Ljubljana 1000, Slovenia.
Univ Ljubljana, Fac Elect Engn, Trzaska 25, Ljubljana 1000, Slovenia.
Univ Ljubljana, Fac Elect Engn, Trzaska 25, Ljubljana 1000, Slovenia.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
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2019 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 200, article id 109933Article in journal (Refereed) Published
Abstract [en]

In ultra-thin chalcopyrite solar cells and photovoltaic modules, efficient light management is required to increase the photocurrent and to gain in conversion efficiency. In this work we employ optical modelling to investigate different optical approaches and quantify their potential improvements in the short-circuit current density of Cu (In, Ga)Se-2 (CIGS) devices. For structures with an ultra-thin (500 nm) CIGS absorber, we study the improvements related to the introduction of (i) highly reflective metal back reflectors, (ii) internal nano-textures applied to the substrate and (iii) external micro-textures by using a light management foil. In the analysis we use CIGS devices in a PV module configuration, thus, solar cell structure including encapsulation and front glass. A thin Al2O3 layer was considered in the structure at the rear side of CIGS for passivation and diffusion barrier for metal reflectors. We show that not any individual aforementioned approach is sufficient to compensate for the short circuit drop related to ultra-thin absorber, but a combination of a highly reflective back contact and textures (internal or external) is needed to obtain and also exceed the short-circuit current density of a thick (1800 nm) CIGS absorber.

Place, publisher, year, edition, pages
ELSEVIER , 2019. Vol. 200, article id 109933
Keywords [en]
Ultra-thin chalcopyrite solar cells, Light management, Reflector, Textures, Optical modelling
National Category
Condensed Matter Physics Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-394192DOI: 10.1016/j.solmat.2019.109933ISI: 000483633400124OAI: oai:DiVA.org:uu-394192DiVA, id: diva2:1359235
Funder
EU, Horizon 2020, 720887 - H2020 NMBP-2016-2017Available from: 2019-10-08 Created: 2019-10-08 Last updated: 2019-10-08Bibliographically approved

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Chen, Wei-ChaoEdoff, Marika

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