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2 May 2012 Electron recombination dynamics in CdSe/P3HT hybrid heterojunctions
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The combination in hybrid heterojunction of nanocrystals and semiconductor polymers has great potential for light-toenergy conversion devices. For this reason, a great number of different quantum dots/polymer molecular solar cells have been investigated. However, less attention has been paid to the photo-induced charge transfer processes at the interface of these systems. Here we report a time resolved spectroscopic study of the electron injection and recombination transfer steps of CdSe/P3HT bulk heterojunction films. From the data obtained using Time Correlating Single Photon Counting (TCSPC) we have inferred that electron injection from P3HT excited state to CdSe nanocrystal conduction band occurs faster than 250 ps and the electron yield is higher than 85%, independently of the nanocrystal shape. On the other hand, the use of Laser Transient Absorption Spectroscopy allowed us to observe that all the studied interfacial charge transfer process can be fitted to dispersive stretched exponentials kinetics, independently of the QD's concentration and nanocrystal morphology, thereby offering evidence of multiple decay process in CdSe/P3HT bulk heterojunctions.
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Emilio Palomares, Eugenia Martinez-Ferrero, and Josep Albero "Electron recombination dynamics in CdSe/P3HT hybrid heterojunctions", Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 84380P (2 May 2012);

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