Title

Cadmium Free Cu 2 ZnSnS 4 Solar Cells with 9.7% Efficiency

Document Type

Article

Publication Date

4-16-2019

Publication Title

Advanced Energy Materials

First page number:

1

Last page number:

8

Abstract

Cu2ZnSnS4(CZTS) thin‐film solar cell absorbers with different bandgaps can be produced by parameter variation during thermal treatments. Here, the effects of varied annealing time in a sulfur atmosphere and an ordering treatment of the absorber are compared. Chemical changes in the surface due to ordering are examined, and a downshift of the valence band edge is observed. With the goal to obtain different band alignments, these CZTS absorbers are combined with Zn1−xSnxOy (ZTO) or CdS buffer layers to produce complete devices. A high open circuit voltage of 809 mV is obtained for an ordered CZTS absorber with CdS buffer layer, while a 9.7% device is obtained utilizing a Cd free ZTO buffer layer. The best performing devices are produced with a very rapid 1 min sulfurization, resulting in very small grains.

Keywords

Cu2ZnSnS4; Thermal treatment; Thin-film solar cells; Valence bands

Disciplines

Biochemistry | Chemistry | Environmental Chemistry

Language

English

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