Vyacheslav Diev - Organic photovoltaics incorporating electron conducting exciton blocking layers

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  Publication Details (including relevant citation   information):

  Appl.   Phys. Lett.   2011, 98, 243307.


  We demonstrate that 3,4,9,10 perylenetetracarboxylic   bisbenzimidazole (PTCBI) and   1,4,5,8-napthalene-tetracarboxylic-dianhydride (NTCDA) can   function as electron conducting and exciton blocking layers when   interposed between the acceptor layer and cathode. A   low-resistance contact is provided by PTCBI, while NTCDA acts as   an exciton blocking layer and optical spacer. Both materials   serve as efficient electron conductors, leading to a fill factor   as high as 0.70. By using an NTCDA/PTCBI compound blocking layer   structure in a functionalized-squaraine/C60-based   device, we obtain a spectrally corrected power conversion   efficiency of 5.1±0.1% under 1 sun, AM 1.5G simulated solar   illumination, an improvement of >25% compared   to an analogous device using a conventional bathocuproine layer   that has previously been shown to conduct electrons via   damage-induced midgap states.

  Address (URL): http://apl.aip.org/resource/1/applab/v98/i24/p243307_s1