ECN publicatie:
Femtosecond spectroscopic studies of photoinduced electron transfer in MDMO-PPV:ZnO hybrid bulk heterojunctions
Cecchetto, E.; Slooff, L.H.; Cola, L. de; Zhang, H.
Gepubliceerd door: Publicatie datum:
ECN Zonne-energie 3-1-2007
ECN publicatienummer: Publicatie type:
ECN-W--07-001 Artikel wetenschap tijdschrift
Aantal pagina's:

Gepubliceerd in: Journal of Luminescence (Elsevier), , 2007, Vol.122-123, p.546-548.

The photophysics of charge carriers (polaron) in MDMO–PPV:ZnO hybrid bulk heterojunction is studied at 80K by femtosecond transient absorption spectroscopy. A short-lived positive polaron is observed in the blend phase in MDMO–PPV:ZnO blend films with a weight ratio of 1:1 and 1:2. Further increase of ZnO weight ratio results in a significant quenching of the polaron absorption. The results are discussed in the concept that both pristine polymer and MDMO–PPV:ZnO blend phases coexist in the blend films. It is concluded that a polaron is photogenerated within the excitation laser pulse (o100 fs) and electron transfer efficiency is highest in blend films 1:1 and 1:2. Lack of the interfacial area and faster back electron transfer process are discussed to be responsible for the quenching of the electron transfer efficiency in blend film 1:3.

Terug naar overzicht.