eprintid: 40866 rev_number: 14 eprint_status: archive userid: 1903 dir: disk0/00/04/08/66 datestamp: 2016-09-07 18:01:45 lastmod: 2022-11-30 09:00:00 status_changed: 2016-09-07 18:01:45 type: article metadata_visibility: show creators_name: Barrigón Montañés, Enrique creators_name: Espinet González, Pilar creators_name: Contreras, Yedileth creators_name: Rey-Stolle Prado, Ignacio creators_id: enrique.barrigon@ies-def.upm.es title: Implications of low breakdown voltage of component subcells on external quantum efficiency measurements of multijunction solar cells ispublished: pub subjects: telecomunicaciones keywords: Ge subcell; breakdown voltage; external quantum efficiency; multijunction solar cells abstract: The electrical and optical coupling between subcells in a multijunction solar cell affects its external quantum efficiency (EQE) measurement. In this study, we show how a low breakdown voltage of a component subcell impacts the EQE determination of a multijunction solar cell and demands the use of a finely adjusted external voltage bias. The optimum voltage bias for the EQE measurement of a Ge subcell in two different GaInP/GaInAs/Ge triple-junction solar cells is determined both by sweeping the external voltage bias and by tracing the I–V curve under the same light bias conditions applied during the EQE measurement. It is shown that the I–V curve gives rapid and valuable information about the adequate light and voltage bias needed, and also helps to detect problems associated with non-ideal I–V curves that might affect the EQE measurement. The results also show that, if a non-optimum voltage bias is applied, a measurement artifact can result. Only when the problems associated with a non-ideal I–V curve and/or a low breakdown voltage have been discarded, the measurement artifacts, if any, can be attributed to other effects such as luminescent coupling between subcells. date: 2015-11 date_type: published publisher: Wiley Online Library official_url: http://onlinelibrary.wiley.com/doi/10.1002/pip.2597/abstract;jsessionid=EDED821223570CC20693BD6458752306.f02t02 id_number: 10.1002/pip.2597 full_text_status: public publication: Progress in Photovoltaics volume: 23 number: 11 pagerange: 1597-1607 institution: Ies department: otro refereed: TRUE issn: 1062-7995 rights: by-nc-nd comprojects_type: MINECO comprojects_type: MINECO comprojects_type: MINECO comprojects_type: MINECO comprojects_type: CM comprojects_code: IPT-2011-1441-920000 comprojects_code: TEC2011-28639-C02-01 comprojects_code: TEC2012-37286 comprojects_code: IPT-2011-1408-420000 comprojects_code: S2009/ENE1477 comprojects_acronym: SIGMAPLANTAS comprojects_acronym: ENERGRAP comprojects_acronym: NUMANCIA II comprojects_leader: Abengoa Solar New Technologies S.A comprojects_leader: Graphenea S.A. comprojects_title: La Innovación en las Plantas y Modelos de Sistemas de Concentración Fotovoltaica en España” comprojects_title: Células solares para alta concentración con eficiencias superiores al 40% comprojects_title: Fabricación por MOVPE de células solares multiunion de. Semiconductores III-V sobre silicio comprojects_title: Grapheno en Aplicaciones de Energía citation: Barrigón Montañés, Enrique and Espinet González, Pilar and Contreras, Yedileth and Rey-Stolle Prado, Ignacio (2015). Implications of low breakdown voltage of component subcells on external quantum efficiency measurements of multijunction solar cells. "Progress in Photovoltaics", v. 23 (n. 11); pp. 1597-1607. ISSN 1062-7995. https://doi.org/10.1002/pip.2597 . document_url: https://oa.upm.es/40866/1/INVE_MEM_2015_223469.pdf