Nanocomposites and nanomaterials

Morphological properties of the clonidine and sulfacetamide films on a patterned n-type silicon for optoelectronic applications
Matiash O. S1, Smertenko P.S.2, Roshchyna N. M.2
1 Igor Sikorsky Kyiv Politechnic Institute, 
Prospect Peremohy, 37, Kyiv-03056, Ukraine. 
E-mail: oleksmatiash@gmail.com
2 V. E. Lashkaryov Institue of Semiconductor Physics NAS of Ukraine, 
Prospect Nauki, 41, Kyiv-03028, Ukraine

In this work an influence of a morphology of an organic layer and composition on the solar cell’s electrical parameters, as short-circuit current, open-circuit voltage and fill factor is studied.
The cell was formed of a silicon substrate with an organic layer deposited on it. A front contact was formed by a conductive silver paint.
4 different organic layers with different deposition times were studied: a pure clonidine, a pure sulfacetamide, 1:3 and 3:1 clonidine-sulfacetamide compounds(respectively). Deposition times were 40,60 and 100 minutes.
The results show that a formation of a net structure within the organic layer occurs near the time of 100 min because of self-organization processes and that improves the electrical properties of the solar cell comparing to lower values of time. The best results are obtained for 100 minutes in all 4 cases: the increase is 10-15% for short-circuit current, 40-96% for the fill factor and 15-27% for the open-circuit voltage depending on the organic layer’s material used.
It was also shown that using the compounds instead of the pure materials leads to an improvement of the cell’s parameters. The best results were demonstrated for the 3:1 clonidine-sulfacetamide compound, so decreasing the percentage of the sulfacetamide in the compound will be further investigated.
To conclude: the electrical properties of the hybrid solar cell are improved by forming the net structure within its organic layer by self-organization processes and by using the compound instead of the pure material. Hybrid solar are very prospective comparing to the classical silicon technology cells due to their extended lifetime, low cost in terms of an economic compromise between the efficiency and the price[1] and low temperature manufacturing technology.

1.	E. L. Aleksandrova, Semiconductors 38 (2004) 1153.