UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 2:28
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Conference: Bucharest University Faculty of Physics 2011 Meeting


Section: Solid State Physics and Materials Science


Title:
Indium Zinc Oxide Used as Transparent Conducting Film in Photovoltaic Cells Based on Organic Active Layers


Authors:
Iulia Arghir(1,4),Cristina Besleaga(1), L. Ion(1), Veta Ghenescu(1,2), G. Socol(3), A. Radu(1), S. Antohe(1)


Affiliation:
1) University of Bucharest, Faculty of Physics, 405 Atomistilor Street, PO Box MG-11, 077125, Magurele-Ilfov, Romania

2) Institute for Space Sciences, 409 Atomistilor Street, PO Box MG-23, 077125, Magurele-Ilfov, Romania

3National Institute for Lasers, Plasma and Radiation Physics, Magurele, Ilfov, Romania

4) National Institute of Material Physics (NIMP-RO), 105 bis Atomistilor Str., PO Box MG. 7, 077125, Magurele-Ilfov, Romania


E-mail


Keywords:
zinc oxide, photovoltaic cells, organic layer, PLD, TCO


Abstract:
The improvement of transparent conducting oxides (TCO) has become a priority research topic in the field of solar energy conversion. Such contacts have to be made from low-cost materials, they must have high conductivities and high transmittance values in the NIR-Vis range of the solar spectrum. A promising alternative is the ZnO which has received much attention as transparent conducting electrode for solar cells due to its remarkable properties (large band gap ~3.4 eV, large exciton binding ~60 meV, high transparence more than 90%, versatility in doping leading to high conductivity~103 W-1 cm-1) Amorphous and highly transparent indium zinc oxide (IZO) thin films were obtained using PLD technique. IZO samples were prepared using targets with different In concentrations, In/(In+Zn) (70 at.%, 80 at.% and 90 at.% ). The deposition was performed at low substrate temperatures and the targets were ablated by a KrF laser source under an oxygen atmosphere. The P3HT:PCBM layers were prepared using spin-coating technique, the CuPc films and the Al top contact were deposited by thermal vacuum evaporation. The obtained photovoltaic structures were analyzed from the electrical point of view, measuring the Current-Voltage (I-V) characteristics in dark, and photoelectrical characterization was performed in A.M. 1.5 conditions. The action spectra revealed that in the case of IZO/PEDOT/P3HT:PCBM/Al and IZO/PEDOT/P3HT:PCBM/LiF/Al samples, the EQE values are larger compared with the IZO/CuPc/Al, due to the higher absorbance of the blend. Our research study shows that ZnO can successfully replace ITO as TCO in photovoltaic cells based on organic active layers.