Publication date: 1st April 2013
Photovoltaic conversion requires two successive steps: i) accumulation of photogenerated charge and ii) charge separation. Here we are going to highlight the importance of these processes in order to obtain an optimized photovoltaic device. To illustrate these topics two different configurations of semiconductor nanostructured solar cells will be used as examples:
- Importance of charge accumulation will be introduced with the recently developed perovskite solar cells. The signature of perovskite light absorber material, undetectable by impedance spectroscopy in conventional sensitized solar cells, has been observed.
- Charge separation and the role of selective contacts will be analyzed for colloidal quantum dot (CQD) solar cells. In this kind of cells, a thin layer formed by CQDs harvests and transports photogenerated charges. These charges can be selectively extracted based on kinetic consideration depending on the material used for the contact, consequently an electrical field is not strictly needed for charge separation in this kind of configuration in contrast with the assumption usually admitted.
This presentation provides an overview of two of the most currently investigated solar cell configurations using nanostructured semiconductors, highlighting some of the controversies detected in these systems.
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