24.2% efficient POLO back junction solar cell with an AlO_x/SiN_y dielectric stack from an industrial-scale direct plasma-enhanced chemical vapor deposition system

verfasst von

Byungsul Min, Verena Mertens, Yevgeniya Larionova, Thomas Pernau, Helge Haverkamp, Thorsten Dullweber, Robby Peibst, Rolf Brendel

Abstract

An aluminum oxide (AlO_x)/silicon nitride (SiN_y) dielectric stack was developed using an industrial plasma-enhanced chemical vapor deposition (PECVD) system with low-frequency (LF) plasma source for the surface passivation of undiffused textured p-type crystalline silicon. The median recombination current density is 4.3 fA cm⁻² as determined from photoconductance decay lifetime measurements and numerical device modeling. To the best of our knowledge, this is the first time to present a high-quality LF-PECVD AlO_x/SiN_y passivation stack on undiffused textured p-type crystalline silicon wafers, which are cleaned with industrial processes using HF, HCl, and O₃. The simulation agrees well with the measured effective carrier lifetime if the velocity parameters of 5.6 cm s⁻¹ for holes and 803 cm s⁻¹ for electrons are applied with a fixed negative charge density of −3 × 10¹² cm⁻². The process integration of developed AlO_x/SiN_y dielectric stack is successfully demonstrated by fabricating p-type back junction solar cells featuring a poly-Si-based passivating contact at the cell rear side. As the best cell efficiency, we achieve 24.2% with an open-circuit voltage of 725 mV on a M2-sized Ga-doped p-type Czochralski-grown Si wafer as independently confirmed by ISFH CalTeC.

Organisationseinheit(en)

Institut für Festkörperphysik

Externe Organisation(en)

Institut für Solarenergieforschung GmbH (ISFH)
Centrotherm

Typ

Artikel

Journal

Progress in Photovoltaics: Research and Applications

Anzahl der Seiten

9

ISSN

1062-7995

Publikationsdatum

06.06.2024

Publikationsstatus

Elektronisch veröffentlicht (E-Pub)

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Physik der kondensierten Materie, Elektrotechnik und Elektronik

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1002/pip.3828 (Zugang: Geschlossen)