Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: Poster: Hybrid and Perovskite Photovoltaics
CPP 11.23: Poster
Montag, 7. März 2016, 18:15–21:00, Poster B2
Electric characterization of single crystalline and polycrystalline Copper-Zinc-Tin-Sulfide — •Martin Handwerg1,2, Rüdiger Mitdank1, Justus Just2, Segej Levcenco2, Thomas Unold2, and and Saskia F. Fischer1 — 1AG Neue Materialien, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin, Germany
Copper Zinc Tin Sulfide (CZTS) is investigated as absorption layer for solar cells to increase their efficiency. To understand the electrical transport mechanism in this material system, temperature dependent electrical conductivity measurements are carried out. Here, the temperature dependence of the electrical conductivity of single crystals and polycrystalline films is investigated. The composition of the polycrystalline films range from high copper (2.29 nCu/nZn+Sn) to low copper content (0.47 nCu/nZn+Sn), where as the single crystals have a stoichiometric composition. All measurements were performed between 4.2 K and 300 K and show an increase of conductivity with increasing temperature. Different hopping transport mechanism occur in different temperature regions: Nearest neighbor hopping at high temperatures, Mott variable range hopping at intermediate temperatures and Efros-Shklovskii hopping at low temperatures. Grain boundary scattering is detected in polycrystalline material as well. Also, the electrical conductivity increases with increasing copper content. Specific electrical applications can be designed by knowing these material properties.