Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Among all the novel high efficient donor polymer synthesized for organic bulk heterojunction solar cells, polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7) is one of the most promising and widely studied donor materials that allow efficiencies up to 9%. In our group, we could obtained high efficiency in solar cells based ITO/PEDOT:PSS/PTB7:PC71BM/ZnO/AL of 7.6%. Different processing conditions which dramatically have influenced the solar cells performances have been investigated: heat temperature, nature of the zinc oxyde, zinc oxyde deposition.
To clarify the link between the performance of the devices and charge transport properties within the active layer, we studied ambipolar charge transport properties of PTB7:PC71BM blends by using at first the analysis of the transfer characteristic of organic field effect transistor (OFET). In the second time, to better understand the transport properties between the electrode of the solar cells, we used space charge limited current (SCLC) analysis by fabrication of electron and hole only devices and correlated the results with the in plane mobility obtained in OFET devices. Furthermore we studied in detail electron extraction at the cathode as a function of the ZnO interlayer thickness, Al doping level and morphology.
Aix-Marseille University, Centre Interdisciplinaire de Nanosciences de Marseille CINaM, UMR CNRS 7325, 13288 Marseille, France.
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