A quantitative model for charge carrier transport, trapping and recombination in nanocrystal-based solar cells.

ABSTRACT: Improving devices incorporating solution-processed nanocrystal-based semiconductors requires a better understanding of charge transport in these complex, inorganic-organic materials. Here we perform a systematic study on PbS nanocrystal-based diodes using temperature-dependent current-voltage characterization and thermal admittance spectroscopy to develop a model for charge transport that is applicable to different nanocrystal-solids and device architectures. Our analysis confirms that charge transport occurs in states that derive from the quantum-confined electronic levels of the individual nanocrystals and is governed by diffusion-controlled trap-assisted recombination. The current is limited not by the Schottky effect, but by Fermi-level pinning because of trap states that is independen

SUBMITTER: Bozyigit D 

PROVIDER: S-EPMC4317500 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature