Stefan Luxembourg, ECN

Title: Efficient application of a silicon nanocrystal downconverter to a c-Si solar cell
Session: Monday 5 October, 14:00


Spectral conversion aims at improving solar cell efficiency through modification of the incident solar spectrum. Silicon nanocrystals (Si NCs) can downshift incoming blue-UV photons to the near infrared, where the c-Si solar cell's internal quantum efficiency (IQE) is near 100%. In addition, Si NCs have been shown to demonstrate space-separated quantum cutting, a process which yields the emission of two (or more) downshifted photons upon absorption of a single high energy photon. Here, we apply a Si NC spectral shaper to the glass cover in a c-Si module configuration and optimize the optical stack to achieve 87% emission coupling efficiency. Ray-tracing simulations predict a 1 - 3% gain in short circuit current for this configuration for moderate levels of quantum cutting, mainly limited by parasitic absorption in the spectral range of high IQE.





Stefan Luxembourg works as researcher at ECN Solar Energy, where he is involved in several projects focusing on light management and spectral conversion in crystalline silicon solar cells and modules. Before he joined ECN Solar Energy he obtained his PhD degree in (biomolecular)physics at FOM Institute Amolf after which he moved into the field of photovoltaics working as postdoc at Delft University of Technology on photonic crystals and superlattices. In 2009 he joined ECN, where he first worked in the field of Energy Policy before he joined the Solar Energy unit in 2012.



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