Programm Photovoltaik Ausgabe 2009 ... - Bundesamt für Energie BFE

5/6
Figure 2: Scheme of a monolithic tandem device integrating a DSC top cell and a CIGS bottom cell.
The monolithic tandem device reached an initial power conversion efficiency of 9.9%. The open circuit
potential is close to the sum of the potentials of the top and bottom cell, clearly demonstrating the existence
of a series-connected double junction. However, the performance of the tandem device degrades
within hours. Analysis of the degradation mechanism is currently in progress. In order to further
optimize the device conducting oxides with better transparency will be employed.
Part C
The goal of this year’s workshop entitled “A look inside solar cells” was to provide tutorial lectures from
world renowned experts in the various fields of thin film photovoltaics (Monte Verità, November 16 th to
18 th 2008). The prestigious panel of speakers comprised Prof. L:M: Peter, Prof. M. Burgelman, Prof. R.
Janssen, Dr. T. J: Coutts as well as Prof. B. Rech. Furthermore, a full day was reserved for student
presentations and posters. About 60 scientists, mostly students, participated in the event.
National / international collaborations
The project benefit from the numerous individual contacts and collaborations of the partners.
Collaboration with the theoretical modelling group at the Institute of Computational Physics at ZHAW
was intensified this year.
ThinPV, F. Nüesch, Empa
173/290