Dresden 2011 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.59: Poster
Thursday, March 17, 2011, 18:00–21:00, P4
Preparation and immobilization of noble metal nanoparticles for plasmonic solar cells — •Ruoli Wang1,2, Martin Pitzer1,2, DongZhi Hu1,2, Daniel M. Schaadt1,2, and Ljiljana Fruk2 — 1Institut für Angewandte Physik,Karlsruhe Institut für Technologie (KIT),76131 Karlsruhe — 2DFG Centrum für Funktionelle Nanostrukturen (CFN), KIT
Thin-film solar cells are of high interest due to good electrical properties and low material consumption. Traditional thin-film cells, however, have considerable transmission losses because of the reduced absorption volume. A promising way to enhance absorption in the active layer is the light-trapping by plasmonic nanostructures. Metallic nanoparticles have in particular shown large enhancement of the photocurrent in thin-film devices. In this poster, we present preparation of Au,Ag and Pt nanoparticles by polyol method and seed mediated methods for use in plasmonic solar cells. Polyol method typically uses ethylene glycol as the solvent and reducing agent,and in seed-mediated synthesis small nanoparticle seeds are first prepared and then used to promote the growth of different shapes of nanoparticles. We particulary focus on the use of nanocubes and nanospheres for solar cell design. Following the nanoparticle preparation, a new method to immobilize particles on GaAs surfaces via covalent chemical bonds has been developed which prevents agglomerations and allows control of the surface density. Photocurrent spectra of GaAs pin solar cells with and without particles have been recorded. These measurements show the dependence of the photocurrent enhancement on particle material, shape and density.