Peer-reviewed publications:





Public documents and reports:

New 2017

Report on realization of integrated light trapping structures into bottom cell. Download report.

Report on optimized particle patterning with redesigned master structures or processing. Download report.

Report on the electrical design of tandem cell. Download report.

Publishable summary of the preliminary life cycle assessment. Download report.



  • Report on adaption of EQE and IV measurement equipment for nanowire solar cells.
    Summary: In this deliverable the work related to the preparation of the set-ups intended for the measurements of the EQE and the light IV curves of the nanowire-Silicon tandem cells to be developed within the project is described. In the case of the EQE measurements this has been mainly related to an adaption of the used bias light illumination via identification and purchase of suitable optical filters. For the light IV measurement work concentrated on the spectrum of the multi-source sun simulator. It turned out that for some potential nanowire-Silicon tandem cells particular blue rich spectra are required. This however could successfully be realized with the simulator at Fraunhofer ISE. In summary it can be stated that the set-ups are now well prepared for the measurement of more or less any potential nanowire-Silicon tandem cell. Download report.
  • Report on the status of the different NIL based techniques.
    Summary: In this deliverable, the work related to the patterning of metal nano-particles as catalyst arrays for the highly defined nanowire growth on III/V substrates is described.
    As patterning technique we are evaluating different nanoimprint lithography (NIL) toolings and processes as well as one alternative technique, namely micro-contact
    printing (μCP). As metallisation technique both physical vapour deposition and electroplating are tested. The quality of the realised catalyst arrays is evaluated first
    using scanning electron microscopy (SEM) and atomic force microscopy (AFM). After the following step of epitaxy (work package 2: III/V nanowire growth), the
    quality of the catalyst arrays is rated with respect to optical properties PL energy and luminescence intensity.
    We reproducibly imprint 2” wafers with Au metal particles in a matrix of 200 nm diameter holes and a hexagonal pitch of 500 nm, optimised for light absorption in InP
    NW arrays. NIL is a working method for large scale economically viable patterning. Download report.



Results achieved 2017 now published under Results



Nano-Tandem funded research success: a silicon-based multi-junction solar cell that converts 33% of the sunlight into electricity has been developed by researchers in Frank Dimroth's group.

The results have been published in Nature Energy

Read Fraunhofer ISE's press release