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Photoelectric conversion; solar cells and arrays

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Solution-Processed Indium Doped Zinc Oxide as Electron Transport Layer for Inverted Polymer Solar Cells
Author(s): P. Morvillo, R. Diana, E. Bobeico, C. Minarini
Source: 18th Italian National Conference on Photonic Technologies (Fotonica 2016), 2016, p. 70 (4 .) - 70 (4 .)
Type: ConferencePaper
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In this work, we report the synthesis and the application of a low-temperature sol-gel In-doped zinc oxide (IZO) thin film with various indium content as an electron transport layer (ETL) for high efficiency inverted polymer solar cells (PSCs). The IZO precursor was prepared by dissolving zinc acetate and ethanolamine in the 2-methoxyethanol in the presence of InCl3 at different concentration. Doped ZnO thin films were then deposited on indium tin oxide (ITO)/glass substrates by spin coating the above solution and annealed at 150°C for 5' in air. Inverted polymer solar cells with the configuration ITO/IZO/photoactive layer/MoO3/Ag were realized in order to investigate the performance of the IZO thin film. The photoactive layer was a blend of poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PTB7-Th) and [6,6]-phenyl C71 butyric acid methyl ester ([70]PCBM). We made a comparative study of the photovoltaic behavior of PSCs realized employing IZO films with various indium contents. The best efficiency of 9.27% was reached using a 1 at% IZO film. The improved performance of such device is due to the better charge collection efficiency of this ETL.

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Comparison of various solution processed electron transport layers for high efficiency polymer solar cells
Author(s): R. Diana, P. Morvillo, E. Bobeico, R. Ricciardi, C. Minarini
Source: 2015 Fotonica AEIT Italian Conference on Photonics Technologies, 2015, p. 4 . - 4 .
Type: ConferencePaper
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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.

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