Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
While promising candidates for next generation solar cells, nanocrystal-based solar cells still suffer from inferior efficiency compared to traditional and other emerging solar cell technologies. Methods to characterize and compare different device architectures and chemical treatments are crucial to improve the overall performance and identifying the limiting factors.
We have recently shown that the decay time measured with transient photovoltage (TPV) measurements in nanocrystal-based solar cells can be associated with the decay time of an RC-circuit where the resistive term indicates the degree of trap-assisted Shockley-Read-Hall recombination and the capacitive contribution comes from the space charge region.
We now apply this method to investigate the influence of device structure (i.e. metal-semiconductor-metal devices vs. hetreojunction device), the chemistry of the absorption layer (i.e, nanocrystal composition, size, and cross linking ligands), and/or the interface layers on the underlying processes in the solar cell (e.g. recombination) and in turn develop design guidelines for NC-based solar cell device fabrication.
[1] Weyde Lin, Deniz Bozyigit, Olesya Yarema, Vanessa Wood. “Transient Photovoltage Measurements in Nanocrystal-Based Solar Cells” J. Physical Chem. C. accepted 2016.
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