Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The metal phthalocyanine complexes (MePc) represent the class of organic low-molecular semiconductors that often are used in different electronic devices, such as gas sensors, organic solar cells, etc. One of the promising materials of the phthalocyanine series for solar cells is p-type vanadyl phthalocyanine (VOPc) with high chemical and thermal stability and effective absorption in the near-infrared range [1]. It is known, that thin vacuum deposited films of VOPc have several polymorphic modifications that are dependent on the conditions of deposition (deposition rate, substrate temperature, etc.) [1, 2]. Accordingly, different polymorphic modifications of VOPc films differ in spectral characteristics and conductivity, therefor these differences can influence performance of the devices based on VOPc films.
In this work were investigated organic solar cells of the structure ITO/VOPc/C60/buffer layer/Al. VOPc films were fabricated in the different conditions. Test cells were obtained by means of thermal vacuum deposition at the vacuum 5 × 10–5 Torr. The first p-type layer of VOPc was deposited on glass substrate with ITO at the different deposition rates: 0.22 nm/s and 0.02 nm/s. Fullerene C60 was applied for the formation of the planar heterojunction. Before deposition of aluminum cathode organic buffer layer of tris-(8-hydroxyquinolinato)aluminum(Alq3) or pyronine G(PyG) was applied.
The structure-properties relationship of VOPc films obtained with different deposition rates was studied. The results showed the more complicated crystal structure and more developed surface relief, which offered the higher conductivity of VOPc film deposited at the rate 0.02 nm/s. As the result the test structure based on VOPc deposited at lower deposition rate had higher conversion efficiencies of solar energy than solar cells with VOPc film obtained at 0.22 nm/s [2], because of the difference in the morphology, and hence, in the transport properties of the layers.
Acknowledgments: Kostiv N.V. acknowledges European Union Structural Funds project “Postdoctoral Fellowship Implementation in Lithuania” for financial support. 1. Aziz, Fakhra; Sulaiman, K.; Karimov, Kh. S.; Sayyad, M. Hassan. The Influence of Doping of Fullerene Derivative (PCBM) on the Optical Properties of Vanadyl Phthalocyanine (VOPc). World Academy of Science, Engineering and Technology 2011, 58, 132-135. 2. Pakhomov, G.L.; Travkin, V.V.; Luk’yanov, A.Yu.; Stakhira, P.I.; Kostiv, N.V. Thin film photovoltaic cells based on vanadyl phthalocyanine and fullerene. Technical Physics 2013, 58, 223–230.
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