Chemical bath deposition of thin film CdSe layers for use in Se alloyed CdTe solar cells
Kerrie Morris
Christos Potamialis
Francesco Bittau
Jake Bowers
Michael Walls
2134/11627370.v1
https://repository.lboro.ac.uk/articles/conference_contribution/Chemical_bath_deposition_of_thin_film_CdSe_layers_for_use_in_Se_alloyed_CdTe_solar_cells/11627370
Chemical bath deposition (CBD) was used as a
method to deposit CdSe thin films for use in CdTe solar cells.
Solution parameters such as precursor stoichiometry,
concentration and deposition time, were varied to assess the
impact on the morphology of the CdSe films deposited on FTO
coated glass. The solution precursors were cadmium acetate and
sodium selenosulphite with NH3 used as a complexant to control
the release of ions into the solution. It was seen that particle size,
surface coverage and thickness were successfully controlled. CdSe
films were grown with a band gap of ~1.74 eV and were made into
full devices with CdTe. A ternary compound of CdTe1-xSex formed
with a band gap of ~1.40 eV, which was shown in an improved EQE
in the IR, as well as an improved Jsc. The best device, with an
efficiency of 12.3% was produced from a 280 nm thick film with a
surface coverage of 59% and grain size of ~600 nm. An increased
response at longer wavelengths due to the lowered band gap
resulted in a high JSC value of 28.2 mA cm-2
sugg
2020-01-16 14:11:34
Cadmium compounds
Photovoltaic Cells
selenium
surface morphology
thin film devices