Routes to develop a [S]/([S]+[Se]) gradient in wide band-gap Cu2ZnGe(S,Se)4 thin-film solar cells

Andrea Ruiz-Perona,Galina Gurieva, Michael Sun,Tim Kodalle,Yudania Sánchez,Maarja Grossberg,José Manuel Merino,Susan Schorr,Máximo León,Raquel Caballero

JOURNAL OF ALLOYS AND COMPOUNDS（2021）

Cited 9|Views21

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Abstract

•[S]/([S]+[Se]) gradient through CZGSSe absorber investigated by GIXRD and GD-OES.•Strong effect of NaF precursor layer thickness on the S distribution through CZGSSe.•Se capping layer before sulfurization modifies S-gradient and Eg of CZGSSe.•Promising efficient wide gap-CZGSSe devices with Eg = 2 eV, Voc = 828 mV and η = 2.7%.

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Key words

Kesterite, Solar cells, Sodium, Selenium capping layer, Sulphur-gradient, Wide band gap energy

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