Abstract
We report here a well crystallized wurtzite phased CdSe nanocrystals by utilizing only octylamine ligand without the use of standard surfactants (TOPO, Fatty acids, Long chain alkyalmines, ODE) by a pyrolytic synthesis at 270°C. The synthesized CdSe nanocrystals possess a diameter of ~6nm with a band gap of 1.85eV. Hybrid P3HT:CdSe heterojunction solar cells have been fabricated from the blends of the synthesized CdSe nanocrystals and poly (3-hexylthiophene) (P3HT) in a chloroform solvent which shows a maximum power conversion efficiency of 1.41%. However, standard CdSe quantum dot nanocrystals show a low conversion efficiency of 0.08% due to presence of a thick ligand shell. The enhanced efficiency can be attributed to the surface narrow size distribution (thin shell) and better optical properties; additionally it does not require post synthetic pyridine treatment. The details of morphological and optical properties of samples have been analyzed by TEM, XRD, UV–vis, PL, J–V and EQE techniques.
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