title: Implications of low breakdown voltage of component subcells on external quantum efficiency measurements of multijunction solar cells
creator: Barrigón Montañés, Enrique
creator: Espinet González, Pilar
creator: Contreras, Yedileth
creator: Rey-Stolle Prado, Ignacio
subject: Telecommunications
description: 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.
rights: https://creativecommons.org/licenses/by-nc-nd/3.0/es/
date: 2015-11
type: info:eu-repo/semantics/article
type: Article
source: Progress in Photovoltaics, ISSN 1062-7995, 2015-11, Vol. 23, No. 11
type: PeerReviewed
format: application/pdf
language: eng
relation: http://onlinelibrary.wiley.com/doi/10.1002/pip.2597/abstract;jsessionid=EDED821223570CC20693BD6458752306.f02t02
relation: info:eu-repo/grantAgreement/MINECO//IPT-2011-1441-920000
relation: info:eu-repo/grantAgreement/MINECO//TEC2011-28639-C02-01
relation: info:eu-repo/grantAgreement/MINECO//TEC2012-37286
relation: info:eu-repo/grantAgreement/MINECO//IPT-2011-1408-420000
relation: info:eu-repo/grantAgreement/CAM//S2009%2FENE1477
rights: info:eu-repo/semantics/openAccess
relation: info:eu-repo/semantics/altIdentifier/doi/10.1002/pip.2597
identifier: https://oa.upm.es/40866/