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III-V quantum dot systems are widely studied for implementing the promising intermediate band solar cell concept. However, current performances are quite lower than theoretical expectations and several losses mechanisms were proposed to explain experimental findings. Here we show that quantum dot solar cells are far from a simple intermediate band system, because of a complex energy structuring. Thanks to the combination of high quality hetero-structures and high resolution modulation spectroscopy, we experimentally unveil specific resonances, hidden upon continuous wave spectroscopy inspection because of ensemble effects and thermal broadening. These resonances are associated to strain induced localized states and to crossed transitions, and arise from the coexistence of materials with different dimensionalities, i.e., nanostructures, wetting layers and continuum. The study clearly shows that …
American Chemical Society
Publication date: 
13 Jul 2020

Arianna Creti, Vittorianna Tasco, Giovanni Montagna, Iolena Tarantini, Abdelmajid Salhi, Adriana Passaseo, Mauro Lomascolo

Biblio References: 
ACS Applied Nano Materials