Novel hybrid nanocomposite heterostructures based on ZnO and poly-3-methylthiopen for photovoltaic devices

Dmytro Sydorov 1A. Pud 1Tsukasa Yoshida 2Kentaro Chikamatsu 2Petro Smertenko 4Yuriy Piryatinski 3

1. Institute of bioorganic chemistry and petroleum chemistry (IBPC), Kharkovske shosse, 50, Kiev 02160, Ukraine
2. Gifu University, Environmental and Renewable Energy Systems, Graduate School of Engineering, Gifu 501-1193, Japan
3. Institute of Physics National Academy of Sciences of Ukraine, prosp. Nauki, 46, Kiev 0365, Ukraine
4. V. Lashkaryov Institute of Semiconductor Physics NASU (ISP), 41, pr. Nauki, Kiev 03028, Ukraine

Abstract

Currently hybrid dye sensitized solar cells (DSSC) are considered as an important alternative for silicon based photovoltaics in a sector of cheap devices. Photoactive inorganic anode materials, such as ZnO, TiO2 are generally used in these cells. But DSSCs have substantial shortcoming hampering their wide application. Specifically, the most effective cells are filled with a liquid electrolyte, and special conditions are needed for their storage and exploitation. Our work is directed on elaboration of composite structures for solid-state photovoltaic cells with ZnO photoanode having highly developed surface, which is interpenetrated with photovoltaically active organic polymer poly-3-methylthiophen (P3MT). The photoanode consisted of two electrochemically deposited ZnO layers: the first one was a dense layer contacting with conducting fluorinated thin oxide glass and the second one was a porous overlayer of ZnO nanorods. Interpenetration of P3MT chains between ZnO nanorods and a good contact of these p-type organic and n-type inorganic counterparts were realized through specific electrochemical polymerization of 3MT at the electrode covered with above-mentioned two ZnO layers. The polymerization was run in solutions of LiCIO4 and 3MT in dry acetonitrile. The best ZnO/P3MT heterostructures were obtained at potentials ~1.2 V vs. Ag/Ag+ reference electrode. These photoactive heterostructures both in oxidized (conducting) and reduced (semiconducting) forms were characterized by UV-Vis and PL spectroscopy, SEM, dark and light I-V measurements. The results confirmed interaction and charge transfer between the inorganic and organic components and, in turn, testified to good perspectives of the developed interpenetrated heterostructures. It should be emphasized here that electrodeposition of all the materials from solutions in the present approach without applying high temperatures thus allows using conducting plastic films to achieve flexible photovoltaic cells also.

 

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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium I, by Dmytro Sydorov
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-12 14:21
Revised:   2009-06-07 00:48