Pyrolytic synthesis of densely packed grown CdSe nanoparticles using a dual function octylamine for hybrid solar cells
by Khan, M. A.; Farva, U.; Kang, Y. M.
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 degrees C. The synthesized CdSe nanocrystals possess a diameter of similar to 6 nm with a band gap of 1.85 eV. 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.
- Journal
- Materials Letters
- Volume
- 123
- Year
- 2014
- Start Page
- 62-65
- URL
- https://dx.doi.org/10.1016/j.matlet.2014.02.071
- ISBN/ISSN
- 1873-4979; 0167-577X
- DOI
- 10.1016/j.matlet.2014.02.071