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      Evaluation of recombination losses in thin film solar cells using an LED sun simulator − the effect of RbF post-deposition on CIGS solar cells

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          Abstract

          Distinguishing among different electrical loss mechanisms − such as interface and bulk recombination − is a common problem in thin film solar cells. In this work, we report a J–V measurement technique using different illuminating spectra to distinguish between these two recombination losses. The basic idea is to change the relative contribution of bulk recombination to the total losses of photo-generated charge carriers by generating them in different depths within the absorber layer using different spectral regions of the illuminating light. The use of modern LED sun-simulators allows an almost free design of illumination spectra at intensities close to 1 sun. The comparison of two simple J–V measurements, one recorded with illumination near the absorber's band-gap energy and one with light of higher energy, in combination with supporting measurements of the absorber properties, as well as device modeling, enables the extraction of the diffusion length and the interface recombination velocity. Using this technique, we show that in CIGS solar cells, an RbF post-deposition treatment does not only reduce interface recombination losses, as often reported, but also reduces bulk recombination in the CIGS absorber. Furthermore, we find that both cells, with and without RbF treatment, are dominantly affected by interface recombination losses.

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          Modelling polycrystalline semiconductor solar cells

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            Effects of heavy alkali elements in Cu(In,Ga)Se2solar cells with efficiencies up to 22.6%

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              Long lifetimes in high-efficiency Cu(In,Ga)Se2 solar cells

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                Author and article information

                Journal
                epjpv
                https://www.epj-pv.org
                EPJ Photovoltaics
                EPJ Photovolt.
                EDP Sciences
                2105-0716
                28 September 2018
                28 September 2018
                2018
                : 9
                : ( publisher-idID: epjpv/2018/01 )
                : 9
                Affiliations
                Helmholtz Zentrum Berlin, , 12489 Berlin, Germany,
                Author notes
                Article
                pv180002
                10.1051/epjpv/2018006
                82120245-8dae-4d53-b022-bf6638bca8a7
                © M.D. Heinemann et al., published by EDP Sciences, 2018

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 25 January 2018
                : 28 April 2018
                : 21 June 2018
                Page count
                Figures: 8, Tables: 0, Equations: 0, References: 20, Pages: 6
                Categories
                Semiconductor Thin Films
                Regular Article
                Custom metadata
                EPJ Photovoltaics 9, 9 (2018)
                2018
                2018
                2018

                Sustainable & Green chemistry,Materials technology,Semiconductors,Materials for energy,Technical & Applied physics,Renewable energy
                LED,CIGS,bulk recombination,RbF,interface recombination

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