Voltage

Engineering

Materials science

Capillary number

Capillary action

Open-circuit voltage

Nanotechnology

Interface (matter)

CZTS

Solar cell

Composite material

Heterojunction

Photovoltaics

Kesterite

Optoelectronics

Photovoltaic system

Electrical engineering

Engineering physics

Journal of Materials Chemistry A

We review critical aspects of interface engineering of the absorber–buffer heterojunction in CZTSSe solar cells and highlight the importance of tools that are essential to identify and eradicate the root causes of low efficiency.

Progress and prospects of CZTSSe/CdS interface engineering to combat high open-circuit voltage deficit of kesterite photovoltaics: a critical review