In this work a novel combination of side chain functionalities, alkyl-phosphonate (EP) and alkyl-ammonium bromide (NBr) groups, on a polyfluorene backbone (PF-NBr-EP) was studied as cathode interfacial material (CIM) in polymer-based solar cells. The devices were made with a conventional geometry, with PTB7:PC71 BM as active layer and aluminum as metal electrode. The CIM showed good solubility in ethanol and film forming ability onto the active layer so that its deposition could be finely tuned. The interface engineering imparted by this CIM was assessed and discussed through kelvin probe force microscopy (KPFM), impedance spectroscopy, charge recombination and electron transport characterizations. To discriminate between the interfacial modifications imparted by the interlayer and its solvent, we included in this study a surface ethanol treated device. In the optimized conditions an average power conversion efficiency of 7.24% was obtained, which is about 60% higher when compared to devices made with bare Al and 26% when compared to devices made with a standard calcium/aluminum cathode. Besides performances, some insights about the devices shelf life stability are also presented. A good persistency through aging was found for the cathode interfacial engineering capabilities of PF-NBr-EP.

Carulli, F., Scavia, G., Lassi, E., Pasini, M., Galeotti, F., Brovelli, S., et al. (2019). A bifunctional conjugated polyelectrolyte for the interfacial engineering of polymer solar cells. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 538, 611-619 [10.1016/j.jcis.2018.12.027].

A bifunctional conjugated polyelectrolyte for the interfacial engineering of polymer solar cells

Carulli, F
;
Brovelli, S;
2019

Abstract

In this work a novel combination of side chain functionalities, alkyl-phosphonate (EP) and alkyl-ammonium bromide (NBr) groups, on a polyfluorene backbone (PF-NBr-EP) was studied as cathode interfacial material (CIM) in polymer-based solar cells. The devices were made with a conventional geometry, with PTB7:PC71 BM as active layer and aluminum as metal electrode. The CIM showed good solubility in ethanol and film forming ability onto the active layer so that its deposition could be finely tuned. The interface engineering imparted by this CIM was assessed and discussed through kelvin probe force microscopy (KPFM), impedance spectroscopy, charge recombination and electron transport characterizations. To discriminate between the interfacial modifications imparted by the interlayer and its solvent, we included in this study a surface ethanol treated device. In the optimized conditions an average power conversion efficiency of 7.24% was obtained, which is about 60% higher when compared to devices made with bare Al and 26% when compared to devices made with a standard calcium/aluminum cathode. Besides performances, some insights about the devices shelf life stability are also presented. A good persistency through aging was found for the cathode interfacial engineering capabilities of PF-NBr-EP.
Articolo in rivista - Articolo scientifico
Alcohol soluble interlayer; Interfacial engineering; Polyfluorene derivatives; Polymeric solar cells;
English
2019
538
611
619
none
Carulli, F., Scavia, G., Lassi, E., Pasini, M., Galeotti, F., Brovelli, S., et al. (2019). A bifunctional conjugated polyelectrolyte for the interfacial engineering of polymer solar cells. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 538, 611-619 [10.1016/j.jcis.2018.12.027].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/294243
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