Optical Characterization of III-V Multijunction Solar Cells for Temperature-Independent Band Gap Features

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorBaumgartner, H.en_US
dc.contributor.authorOksanen, B.en_US
dc.contributor.authorKärhä, P.en_US
dc.contributor.authorIkonen, E.en_US
dc.contributor.departmentDepartment of Signal Processing and Acousticsen
dc.contributor.groupauthorMetrology Research Instituteen
dc.date.accessioned2020-02-03T08:59:03Z
dc.date.available2020-02-03T08:59:03Z
dc.date.issued2019-11en_US
dc.description.abstractA recently developed method to characterize the band gap energies of III-V optosemiconductors was utilized to determine temperature-invariant band gap features of multijunction solar cells. The method is based on measuring electroluminescent spectra of the solar cells at different temperatures. The normalized spectra reveal temperature-invariant energy values of the different junctions which are further converted to band gap energies. The method utilization requires a calibrated spectroradiometer and a temperature controlled mounting base for the solar cell under test, however, no knowledge about the absolute temperature of the cell under measurement. The method was tested on GaAs and GaInP solar cells that consist of single and dual junctions. The band gap energies were also derived from spectral response measurements. The differences of the determined band gap energies from the literature values were smaller than 1.1%. Compared with other band gap determination methods, the developed method yields temperature-invariant band gap characteristics; with a known uncertainty, that separated the different junctions in a multijunction device without individual biasing for the different junctions. In addition, a temperature-independent characterization parameter ensures that the operating conditions of the device under test do not affect the results.en
dc.description.versionPeer revieweden
dc.format.extent6
dc.format.extent1631-1636
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationBaumgartner, H, Oksanen, B, Kärhä, P & Ikonen, E 2019, ' Optical Characterization of III-V Multijunction Solar Cells for Temperature-Independent Band Gap Features ', IEEE Journal of Photovoltaics, vol. 9, no. 6, pp. 1631-1636 . https://doi.org/10.1109/JPHOTOV.2019.2933190en
dc.identifier.doi10.1109/JPHOTOV.2019.2933190en_US
dc.identifier.issn2156-3381
dc.identifier.issn2156-3403
dc.identifier.otherPURE UUID: 26da36c5-5075-4f02-a1b4-fe154c02c5aaen_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/26da36c5-5075-4f02-a1b4-fe154c02c5aaen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/40450569/ELEC_Baumgartner_Optical_characterization_IEEEJoPV.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/42882
dc.identifier.urnURN:NBN:fi:aalto-202002031961
dc.language.isoenen
dc.publisherIEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
dc.relation.ispartofseriesIEEE Journal of Photovoltaicsen
dc.relation.ispartofseriesVolume 9, issue 6en
dc.rightsopenAccessen
dc.subject.keywordBand gapen_US
dc.subject.keywordlight-emitting diode (LED)en_US
dc.subject.keywordspectral responseen_US
dc.subject.keywordtemperatureen_US
dc.subject.keywordIII-V solar cellsen_US
dc.titleOptical Characterization of III-V Multijunction Solar Cells for Temperature-Independent Band Gap Featuresen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion

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