UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2011 Meeting


Section: Solid State Physics and Materials Science


Title:
PROGRESS IN PHOTOVOLTAIC CELLS BASED ON ORGANIC THIN FILMS &ORGANIC/INORGANIC HYBRID STRUCTURES


Authors:
STEFAN ANTOHE


Affiliation:
University of Bucharest, Faculty of Physics, P.O.Box: MG-11, Bucharest-Magurele, 077125 ROMANIA


E-mail
santohe@solid.fizica.unibuc.ro


Keywords:
organic semiconductors, organic photovoltaic cells, hybrid inorganic/organic photovoltaic cells


Abstract:
In this work are summarized the electrical and photoelectrical properties of the photovoltaic cells based on the organic thin films and hybrid inorganic/organic structures. Photovoltaic cells of second generation, single-layer structures (ITO/CuPc/Al and ITO/TPyP/Al) and double-layer structures based on the p-n heterojunction (ITO/CuPc/TPyP/Al and ITO/Chl a/TPyP/Al) were prepared and characterized. Three-layered organic solar cells with an interlayer of codeposited dyes of p-type CuPc and n-type TPyP between the respective dye layers were also prepared and characterized, showing an increased power conversion efficiency, with respect of double–layer structures. The spectral sensitization of a-Si: H solar cells using an organic layer were also obtained. In the case of third generation of solar cells, the structures based on the P3HT: PCBM (1:1) blend have a power conversion efficiency increased of about two order of degree in respect of those measured in the case of structures based on P3HT or PCBM polymers. In order to increase the area of the interface between the two components of the heterostructure, so to improve the extraction of the charge carriers, three types of hybrid structures based on nanostructured ZnO were prepared: a) Nanostructured ZnO thin films/CuPc; b) ZnO nanowires array/CuPc; c) ZnO nanotubes array/CuPc. EQE of ZnO wire arrays/CuPc structures was four time larger than that of ZnO nanostructured film/CuPc structures and EQE of ZnO nanotubes arrays/CuPc structures was about one order of magnitude higher than that of ZnO nanostructured film/CuPc structures.For second type, hybrid cells based on the heterostructure at the interface between wire arrays of CdTe, and the organic film ZnPc and TPyP, were produced and characterized. EQE of CdTe nws/CdTe (200nm)/ZnPc structures was two order of magnitude higher than in the case of CdTe nws/ZnPc.