In this work PTB7:[70]PCBM (Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diy1] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b] thiophenediyl]]:[6,6]-Phenyl-C71-butyric acid methyl-ester ([70])) based solar cells with PEIE (Polyethylenimine, 80% Ethoxylated) as electron transport layer (ETL) have been characterized along two months using impedance spectroscopy (IS). The experimental data were fitted using an electrical circuit and the time evolution of circuital parameters was analyzed. At high voltages, the capacitance associated to the PEIE layer decreases within the first days of measurements while the resistance increases during the same period. The flat band voltage, V-fb, obtained from a Mott-Schottky analysis, decreases with measuring time around 0.1 V, suggesting a deterioration of PEIE interface that no longer improves the ITO work-function. Carrier mobility decreases from 2.2 x 10(-3) cm(2)/Vs to 2.4 x 10(-4) cm(2)/Vs within the first few days of measurements. (C) 2017 Elsevier Ltd. All rights reserved.

del Pozo, G., Arredondo, B., Romero, B., Susanna, G., Brunetti, F. (2017). Degradation of PEIE interlayer in PTB7:[70]PCBM based solar cells characterized by impedance spectroscopy. SOLAR ENERGY, 144(March 2017), 105-110 [10.1016/j.solener.2017.01.003].

Degradation of PEIE interlayer in PTB7:[70]PCBM based solar cells characterized by impedance spectroscopy

Susanna G.;Brunetti F.
2017-01-01

Abstract

In this work PTB7:[70]PCBM (Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diy1] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b] thiophenediyl]]:[6,6]-Phenyl-C71-butyric acid methyl-ester ([70])) based solar cells with PEIE (Polyethylenimine, 80% Ethoxylated) as electron transport layer (ETL) have been characterized along two months using impedance spectroscopy (IS). The experimental data were fitted using an electrical circuit and the time evolution of circuital parameters was analyzed. At high voltages, the capacitance associated to the PEIE layer decreases within the first days of measurements while the resistance increases during the same period. The flat band voltage, V-fb, obtained from a Mott-Schottky analysis, decreases with measuring time around 0.1 V, suggesting a deterioration of PEIE interface that no longer improves the ITO work-function. Carrier mobility decreases from 2.2 x 10(-3) cm(2)/Vs to 2.4 x 10(-4) cm(2)/Vs within the first few days of measurements. (C) 2017 Elsevier Ltd. All rights reserved.
2017
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-INF/01 - ELETTRONICA
English
Organic solar cells; Impedance spectroscopy; Degradation; PEIE; Low band-gap polymers
del Pozo, G., Arredondo, B., Romero, B., Susanna, G., Brunetti, F. (2017). Degradation of PEIE interlayer in PTB7:[70]PCBM based solar cells characterized by impedance spectroscopy. SOLAR ENERGY, 144(March 2017), 105-110 [10.1016/j.solener.2017.01.003].
del Pozo, G; Arredondo, B; Romero, B; Susanna, G; Brunetti, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/200607
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