In this work we made a comparative study between the electrical performances of three different electron transport layers (ETLs), used to build inverted polymer solar cells (PSCs). Two different metal oxides are prepared with a solution process: the first one is zinc oxide, prepared by a solgel procedure dissolving zinc acetate and ethanolamine in the 2-methoxyethanol, the second one is titanium oxide, prepared by spin coating a solution of commercial Titanium(IV)isoproxide in 2-methoxyethanol.
The last ETL is an alcohol soluble conjugated polymer: poly[(9,9-bis(3'-(N,Ndimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)](PFN). Inverted PSCs with the configuration glass/ITO/ETL/ photoactive layer/MoO3/Ag were realized in order to investigate the performance of different ETL thin films.
The photoactive layer was a blend of poly[(4,8-bis-(2ethylhexyloxy)-benzo[1,2-b;4,5-b'] dithiophene)-2,6-diyl-alt(4-(2-ethylhexanoyl)-thieno[3,4-b]thiopene)-2,6-diyl] and [6,6]-phenyl C71 butyric acid methyl ester. The best power conversion efficiency (6.4%) under simulated AM1.5G illumination of 100 mW/cm2, was achieved for the PSCs fabricated using a ZnO and PFN films
Diana, R., Morvillo, P., Bobeico, E., Ricciardi, R. and Minarini, C., 2015, May. Comparison of various solution processed electron transport layers for high efficiency polymer solar cells. In Fotonica AEIT Italian Conference on Photonics Technologies, 2015 (pp. 1-4). IET.
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