Meet our coating team at the EU PVSEC in Germany!

To improve the molybdenum layers used in thin-film solar cells, we have developed two very special alloys: MoNa for a precise sodium doping, and MoTa for a better corrosion resistance. Dr. Christoph Adelhelm will present both materials at the EU PVSEC.

Thanks to its good adhesion to glass and high level of electrical conductivity, molybdenum is used as a CIGS back contact. As one of the leading manufacturers of molybdenum sputtering targets, Plansee is now able to provide two new molybdenum alloys. These are molybdenum-sodium (MoNa) and molybdenum-tantalum (MoTa).

Targeted improvements of efficiency


Small amounts of sodium in the CIGS absorber improve the efficiency of the solar cell. In the case of glass-based CIGS modules, the soda-lime glass usually also acts as the sodium source. During the production process, sodium from the glass diffuses through the molybdenum back contact into the absorber layer. Unfortunately, this process is not easy to control and the sodium is often unevenly distributed. Sputtering targets made from sodium-doped molybdenum (MoNa) offer a simple alternative. A thin MoNa layer is sputtered above or below the molybdenum back contact. This MoNa layer is then responsible for the controlled release of sodium that occurs as the CIGS absorber is being formed. The concentration of sodium in the absorber can be precisely adjusted by varying the thickness of the layer.

Corrosion protection


Molybdenum can oxidize in corrosive atmospheres. That is why PLANSEE has developed targets made from molybdenum-tantalum. The superior corrosion resistance of this material has been proven in numerous tests.

And if you want to find out more:


Visit the Plansee team at the EU PVSEC from September 24 to 28 in Frankfurt. You will find the Plansee stand in hall 3.0, F29. Alongside molybdenum, MoTa and MoNa, Plansee will use the occasion of the trade fair to present its coating material for CIGS absorber layers and chromium targets for the production of diffusion barriers.

At the PV Production Forum that will be held during the EU PVSEC, Dr. Christoph Adelhelm, application group manager for Solar at Plansee, will tell visitors more about the new materials for CIGS layers. Christoph's address will take place on September 26 from 3.40 to 4.00 pm in hall 4. The EMPA Institute will also present the latest research results concerning the effects of MoNa layers in CIGS in a contribution to the EU PVSEC Conference at 2.30 pm on 26.9.2012

For full information on the trade fair and lecture program, go to

Find more information on our sputtering targets for thin film solar cells.