Enhancement in charge transfer by non-ligand exchange process for colloidal hybrid organic(MEH-PPV):inorganic(CdSe) nanocomposites
2012
In this work, we demonstrate the effect of surface modification of as-synthesized oleylamine-capped spherical CdSe QDs
of size (5-7 nm). The as-prepared CdSe QDs are highly luminescent, monodispersive and exhibit energy transfer effects
upon their dispersion in MEH-PPV polymer matrix. However, repetitive washing of CdSe QDs upon suitable chemical
treatment leads to enhancement in charge transfer process as observed in their corresponding MEH-PPV: CdSe
nanocomposites. Here, no evidence of agglomeration effects and surface states were found. This enhancement in charge
transfer is mainly due to the partial removal of oleylamine capping ligand, which acts as a hindrance in the interaction
between polymer and CdSe QDs. The importance of this study is that as-synthesized CdSe QDs show effective energy
transfer whereas after chemical treatment, it shows enhanced charge transfer mechanism which makes their
corresponding nanocomposites useful for different applications in organic electronic devices such as efficient
electroluminescent (OLED) and photovoltaic (OPV) devices respectively.
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