Journal Article

FZJ-2023-02283

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Impact of the contacting scheme on I-V measurements of metallization-free silicon heterojunction solar cells

Brinkmann, M. (Corresponding author) ; Haase, F. ; Bothe, K. ; Bittkau, K.FZJ* ; Lambertz, A.FZJ* ; Duan, W.FZJ* ; Ding, K.FZJ* ; Sperlich, H.-P. ; Waltinger, A. ; Schulte-Huxel, H. (Corresponding author)

2023
EDP Sciences Les Ulis

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Please use a persistent id in citations: doi:10.1051/epjpv/2023009  doi:10.34734/FZJ-2023-02283

Abstract: I-V measurements are sensitive to the number and positioning of current and voltage sensingcontacts. For busbarless solar cells, measurement setups have been developed using current collection wires andseparate voltage sense contacts. Placing the latter at a defined position enables a grid resistance neglectingmeasurement and thus I-V characteristics independent from the contacting system. This technique has beendeveloped for solar cells having a finger grid and good conductivity in the direction of the fingers. The optimalposition of the sense contact in case offinger-free silicon heterojunction solar cells has not yet been studied. Here, thelateral charge carrier transport occurs ina transparentconductiveoxide layer resulting ina higher lateral resistance.We perform finite difference method simulations of HJT solar cells without front metallization to investigate theimpact of high lateral resistances on the I-Vmeasurement of solar cells.We showthe high sensitivity on thenumberof used wires for contacting as well as the position of the sense contact for the voltage measurement. Using thesimulations,we are able toexplainthe highdifferenceofupto 7.5%infill factormeasurements ofmetal free solar cellswith varying TCO sheet resistances between two measurement systems using different contacting setups. Wepropose a method to compensate for the contacting system to achieve a grid-resistance neglecting measurementwith both systems allowing a reduction of the FF difference to below 1.5%.

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Contributing Institute(s):

1. Photovoltaik (IEK-5)

Research Program(s):

1. 1213 - Cell Design and Development (POF4-121) (POF4-121)

Appears in the scientific report 2023

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Database coverage:
; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; DOAJ Seal ; Ebsco Academic Search ; Emerging Sources Citation Index ; Fees ; IF < 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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