Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster: Nanoparticles and Composite Materials

CPP 12.29: Poster

Monday, March 11, 2013, 17:30–19:30, Poster C

Tuning the electronic properties of the CuInS2 nanoparticles for application in hybrid solar cells — •Rany Miranti¹, Christopher Krause¹, Dorothea Scheunemann¹, Johannes Neumann², Daniela Fenske², Joanna Kolny-Olesiak¹, Holger Borchert¹, and Jürgen Parisi¹ — ¹Univ. of Oldenburg, Dept. of Physics, Energy and Semiconductor Research Laboratory, 26111 Oldenburg, Germany — ²Fraunhofer IFAM, Marie-Curie-Str.1-3 26129 Oldenburg, Germany

CuInS2 (CIS) is one interesting material in solar cell applications because of the wide absorption range extending into the NIR and a lower toxicity. Despite much research in the CIS-based solar cells, the performance of CIS nanocrystal (NC) solar cells remains low so far. In case of CIS/polymer bulk heterojunction solar cells the surface properties of the NCs are one important issue in this field. Modifiying these surface properties is a promising method to influence the performance of the solar cells. Varying Cu to In precursor ratio in the synthesis leads to differences in the Cu and In concentrations in the CIS NCs' surfaces. CIS NCs prepared with Cu excess seem to accept more electrons than those with In excess. In the present work, CIS NCs were synthesized and characterized by XRD and TEM. Furthermore, we studied the composition of the NCs and the ligand shells by EDX and TGA, as well as the I-V characteristics in the hole and electron only devices. The influence of the Cu to In precursor ratio during the synthesis of CIS NCs on the performance of solar cells will also be discussed.