A joint study carried out by researchers of CNST IIT@PoliMi and Politecnico di Milano, and followed by Guglielmo Lanzani, coordinator of the IIT center in Milan, has been awarded as the best Poster at the European Conference on Molecular Electronics 2011.
The presented study shines light on the possible photophysical processes occurring in active material for organic solar cells, crucial to understand the device work mechanism.
In particular, it aims to investigate the charge dynamics in a polymer blend (P3HT:PCBM), widely used as active material for efficient bulk heterojunction solar cells. Combining ultrafast pump-probe spectroscopy with confocal microscopy allows a local imaging of the transient absorption signal with simultaneously high temporal (150 fs) and spatial (300nm) resolution.
Both experimental and theoretical investigations reveal a peculiar long lived charge transfer state at the P3HT:PCBM interface, not affected by geminate recombination and characterized by a different polarization with respect to the one in the usual polydispersed blend.
The authors of the Poster are: Giulia Grancini (PoliMi), Dario Polli (PoliMi), Daniele Fazzi (CNST of IIT), Juan Cabanillas-Gonzalez (IMDEA-Madrid), Giulio Cerullo (PoliMi), and Guglielmo Lanzani (CNST of IIT and PoliMi)."
For more information about the conference: http://www.ecme2011.com