Document Type within your search.
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Journal of Laser Micro/Nanoengineering, 17 (2018) 3, S. 314-323
...Solar cells of the next generation...
OpenAccess 
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IEEE journal of photovoltaics, 7 (2017) 5, S. 1292 - 1297
...Solar cells of the next generation...
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Physica status solidi / Rapid research letters, 10 (2016) 3, S. 233 – 236
...Solar cells of the next generation...