Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The mobility of the charge carriers is one of the main parameter determining efficiency of the organic solar cells (OSC). The estimation of the mobility of charge carriers in OSC by the traditional techniques (time of flight or charge extraction by the linearly increasing voltage - CELIV) is problematic, because of the small thickness of the sample and strong influence of the built-in electric field. We demonstrate the novel technique based on the extraction of the injected charge by the linearly increasing voltage (i-CELIV) for independent investigation of holes and electrons transport in bulk heterojunction OSC [1,2]. This technique requires blocking layer between bulk heterojunction and one of the electrodes. Charge carriers are injected from the opposite electrode with offset and extracted by linearly increasing voltage. The mobility of injected charge carriers is estimated from the extraction current transients. By using this technique we estimated holes and electrons mobilities in thin PCBM:RR-P3HT OSC. This technique could be also used in dye synthetized solar cell for estimating charge carriers mobility in the organic semiconductor and recombination rate at the interface with ZnO or TiO2.
1. G. Juška, N. Nekrašas, K. Genevičius, “Investigation of Charge Carriers Transport from Extraction Current Transients of Injected Charge Carriers”, Journal of Non-Crystalline Solids, 358, 748-750 (2012). 2. A. Armin, G. Juška, M. Ullah, M. Velusamy, P. Burn, P. Meredith, A. Pivrikas.”Balanced Carrier Mobilities: Not a Necessary Condition for High-Efficiency Thin Organic Solar Cells as Determined by MIS-CELIV”Adv.Energy Mater. 4, 1300954 (2014).
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