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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Electrical properties of organic layers for solar cells
 Klosse, Patricie ; Toušek, Jiří (advisor) ; Urbánek, Pavel (referee)
The aim of this work is to measure the diffusion length and mobility of charge carriers in MEH-PPV polymer layers as a function of SiO2 nanoparticle concentration. MEH-PPV samples contained particles with volume concentrations: 0.0%; 3.5%; 6.0%; 18.5%; 25.0%. The diffusion length was measured by the surface photovoltage (SPV) method. The diffusion length for the samples with lower concentrations: 0.0%; 3.5%; 6.0% was approximately constant at about 12 nm. For samples with concentrations of 18.5%; 25.0%, the diffusion length could not be determined due to the effect of additional traps introduced by the nanoparticles. The mobility was measured by charge extraction by applying a linearly increasing photovoltage method CELIV. The mobility came out to be in the order of 1E-06 for the samples 0.0%; 3.5%; 6.0%; 18.5%; with lower nanoparticle concentration, but the mobility increased by an order of magnitude for the sample with nanoparticle concentration of 25%. This is explained by the fact that the SiO2 particles improved the material properties.
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