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O: Fachverband Oberflächenphysik

O 32: Organic Semiconductors: Photovoltaics (HL jointly with CPP, DS, O)

O 32.2: Vortrag

Dienstag, 1. April 2014, 10:15–10:30, POT 081

Alloyed zinc sulfide - copper indium disulfide nanocrystals for application in hybrid photovoltaics — •Björn Kempken, Nikolay Radychev, Christopher Krause, Jie Li, Holger Borchert, Joanna Kolny-Olesiak, and Jürgen Parisi — Carl von Ossietzky University of Oldenburg, 26111 Oldenburg

Semiconductor nanocrystals (NCs) continue to attract immense attention because of their size-dependent optical, physical, and chemical properties which causes them to be a favourable material for hybrid solar cell applications. A promising candidate for the inorganic/organic active layer is alloys of ZnS and CuInS2 (ZCIS NCs), which on the one hand strongly absorb in the visible range up to 800 nm, and, on the other hand, belongs to the "green" type of semiconductor NCs. In the present work, high quality ZCIS NCs were synthesized and subjected to hexanethiol ligand exchange procedures. Laboratory solar cells based on blends of treated ZCIS NCs and poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) as active layer were prepared and investigated by current-voltage and electron spin resonance measurements. Hybrid ZCIS/PCPDTBT laboratory solar cells demonstrate well pronounced diode behavior with outstanding characteristics of the open-circuit voltage which reached up to 1.2 V.