Laser-based monolithic series interconnection of two-terminal perovskite-CIGSe tandem solar cells: determination of the optimal scribe line properties

Christof Schultz; Guillermo Antonio Farias Basulto; Nicolas Otto; Janardan Dagar; Andreas Bartelt; Rutger Schlatmann; Eva Unger; Bert Stegemann

doi:10.1051/epjpv/2023007

Special Issue on ‘WCPEC-8: State of the Art and Developments in Photovoltaics’, edited by Alessandra Scognamiglio, Robert Kenny, Shuzi Hayase and Arno Smets

Open Access

EPJ Photovoltaics 14, 16 (2023)
https://doi.org/10.1051/epjpv/2023007

Regular Article

Laser-based monolithic series interconnection of two-terminal perovskite-CIGSe tandem solar cells: determination of the optimal scribe line properties

Christof Schultz¹^,a^,*, Guillermo Antonio Farias Basulto²^,a, Nicolas Otto¹, Janardan Dagar³, Andreas Bartelt¹, Rutger Schlatmann¹^,2, Eva Unger³ and Bert Stegemann¹

¹ HTW Berlin—University of Applied Sciences, Wilhelminenhofstr. 75a, 12459 Berlin, Germany
² Competence Centre Photovoltaics Berlin (PVcomB), Helmholtz-Zentrum Berlin für Materialien und Energie, Schwarzschildstr. 3, 12489 Berlin, Germany
³ Helmholtz-Zentrum Berlin für Materialien und Energie, Young Investigator Group Hybrid Materials Formation and Upscaling, Kekuléstraße 5, 12489 Berlin, Germany

^* e-mail: schultz@htw-berlin.de

Received: 20 July 2022
Received in final form: 14 November 2022
Accepted: 2 February 2023
Published online: 30 March 2023

Abstract

To achieve a monolithic series interconnection of tandem solar cell devices consisting of a perovskite top cell and a CIGSe bottom cell, a two-terminal interconnection scheme is introduced that includes an additional, fourth patterning step, the so-called iso-cut, which separates the window layer stack between the two solar cells. The implementation of this interconnection scheme requires a process development for a total of four structuring steps, which was achieved by systematically varying the laser parameters. Based on a detailed characterization of the individual scribe line properties with respect to their scribe line depth, morphology, electrical functionality, chemical composition and their influence on adjacent and underlying layers, the optimal patterning parameters and suitable process windows were derived for each step, which is a prerequisite for a loss-free monolithic series interconnection in a tandem module.

Key words: CIGSe / perovskite / tandem solar cells / laser / series interconnection / solar module / thin-film

These authors contributed equally.

© C. Schultz et al., Published by EDP Sciences, 2023

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