An efficiency of 12.4% has been reached with

flexible cadmium telluride (CdTe) thin-film solar cells by EMPA, the

Swiss Federal Laboratories for Materials Testing and Research in

Advertisement

Dubendorf, Switzerland.

The laboratory for thin Films and Photovoltaics

attached flexible CdTe thin-film solar cells on a lightweight polyimide

film by sing low temperatures (<450°C) vacuum evaporation process to

grow cadmium sulphide/cadmium telluride (CdS/CdTe) layers and a

subsequent annealing step in air where the materials are heated up and

cooled down to harden them.

The researchers used zinc oxide doped

on aluminium (ZnO:Al) as a transparent electric contact instead of the

expensive indium tin oxide (ITO) layer used in earlier 11.4% solar

cells.

In addition to being cheaper, the ZnO/ZnO:Al bi-layer

improved process yield and reproducibility of high efficiency solar

cells, EMPA says.

The

12.4% efficiency of the flexible thin-film solar cells was measured

under standard AMI.5 illumination condition. The parameters were Voc =

823 mV, Jsc = 19.6 mA.cm-2, FF = 76.5%.

EMPA says all the process

steps of the flexible thin-film solar cells are compatible with

continuous in-line processing and can be transferred to roll-to-roll

manufacturing of large area solar modules with high deposition speed.

“Such

high efficiency flexible CdTe solar cells can become a low cost option

for cost-effective solar electricity generation in near future,” EMPA

concludes.

Announcement from our Chairman, David C BarclayThe World Renewable Energy Association are delighted to announce the launch of a brand-new initiative exclusively for its members. The Renewable Energy Finance Hub has been launched following the largest survey undertaken with UK businesses conducted by WoREA in conjunction with the UK Government and its partners. Reduce your businesses carbon footprint today and begin your journey towards net zero!