Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 84: [DS] Organic Electronics and Photovoltaics IV (jointly with CPP, HL, and O)

O 84.3: Vortrag

Donnerstag, 17. März 2011, 16:45–17:00, GER 38

improvement of the CdSe/P3HT solar cells efficiency due to surface modification of the CdSe nanoparticles by alkylamine treatments — •nikolay radychev, irina lokteva, holger borchert, joanna kolny-olesiak, and jürgen parisi — institute of physics, energy and semiconductor research laboratory, university of oldenburg,oldenburg,germany

Semiconductor quantum dots (QDs) continue to attract immense attention because of their size-dependent optical, physical, and chemical properties which causes them to be a promising material for hybrid solar cell applications. Meanwhile QDs in a polymer matrix have to be stabilized by organic ligands that show significant influence on the charge transport and charge separation processes. Surface modification procedures such as stabilizing ligand exchange or crosslinking the QDs can enhance the efficiency of the hybrid blends. In the present work, as-synthesized QDs, initially capped with oleic acid, were subjected to ligand exchange procedures with the intention to obtain nanoparticles capped by butylamine ligands. Detailed characterisations of the butylamine stabilized QDs based on thermogravimetric analysis, nuclear magnetic resonance and transmission electron microscopy are shown. Laboratory solar cells with blends of the butylamine capped CdSe QDs and poly-3-hexylthiophene (P3HT) as active layer were prepared and investigated by current-voltage and external quantum efficiency measurements. Energy conversion efficiency of about 2% was obtained. The fundamental reasons of the efficiency enhancement were analyzed