IMEC gears up thin-film solar activities
IMEC is working on copper zinc tin sulphide selenide (CZTSSe) as a replacement for CIGS, the expensive indium-containing inorganic thin-film solar material.
The organisation is aiming to develop a single-junction CZTSSe cell with over 14% efficiency by 2016, and will also make tandem cells by shifting the S/Se ratio to alter absorption wavelength.
One possible tandem configuration (see diagram) is a CZTS top cell to absorb 1.4-1.9eV and a CZTSe bottom cell for 0.8-1.1eV.
Along with crystalline silicon cells, IMEC thin-film solar activities also include organic photovoltaics.
Earlier this year it announced a complete solar module with 5.5% efficient, a world-record.
The organisation is now also claiming a record at 8.3% for an ‘inverted’ polymer cell, “and within five years we will have 10% efficiency and 10 year lifetime”, said IMEC CEO Luc van den hove.
Modules are weather-proofed cells with UV and other protection, and are therefore less efficient than bare cells.