Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Much attention is recently paid to the conversion of solar energy into electrical energy by means of new class of organic devices i.e. organic solar cells (OSCs). The solar energy conversion efficiency of OSCs is lower compared with conventional silicon solar cells. However the use of organic materials in OSCs gives a possibility to make them flexible, sturdy, low cost and environmentally safe [1, 2]. Typicallly, the efficiency of OSC depends on the light absorption efficiency, exciton dissociation efficiency, charge collection efficiency, device architecture [2]. To avoid low solar energy conversion efficiency of OSC and to improve charge carrier transport is needed to search for new hole-transporting and electron-transporting materials for OSC.
In this work we report on the newly synthesized organic p-type semiconductor tri(4-diphenylethenyl-3-methoxyphenyl)amine with high hole mobility of 7,9×10-3 cm2/Vs at an electric field of 2.5×105 V/cm as hole transport material for OSC of the structure ITO/tri(4-diphenylethenyl-3-methoxyphenyl)amine/ DBP/C70/BCP/Al where donor and acceptor materials are DBP and C70 respectively. The experimental device was fabricated by means of thermal vacuum deposition on glass substrate with ITO precursor. The thicknesses of hole-transport layer were 2.5, 5.0, 7.0, 9.5 nm. All the test devices fabricated, handled and charcterized under N2 atmosphere. The current-voltage characteristics of our samples were similar to those widely known for organic photovoltaic devices and showed maximum efficiency of 1.33 % for tri(4-diphenylethenyl-3-methoxyphenyl)amine of 5 nm, as well the maximum open circuit voltage Uoc ~ 0,5 V and short circuit current density Jsc = 5,65 mA/sm2 with high FF (~50%). The quantum efficiency of the fabricated structures was of ca. 30% in the visible range.
Acknowledgments: L. Voznyak acknowledges European Union Structural Funds project “Postdoctoral Fellowship Implementation in Lithuania” for financial support.
1. Nam Su Kang; Byeong-Kwon Ju; Changhee Lee; Jae-Pyoung Ahn; Byung Doo Chin; Jae-Woong Yu. Partitioning of the organic layers for the fabrication of high efficiency organic photovoltaic devices. Organic Electronics 2009, 10, 1091–1096. 2. Dae Hun Kim; Young Pyo Jeon; Se Han Lee; Dea Uk Lee; Tae Whan Kim;Sung Hwan Han. Enhancement of the power conversion efficiency for organic photovoltaic devices due to an embedded rugged nanostructural layer. Organic Electronics 2012, 13, 1068–1072.
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