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Solution-Processed Small-Molecule Bulk Heterojunctions: Leakage Currents and the Dewetting Issue for Inverted Solar Cells

Elodie Destouesse 1 Sylvain Chambon 1 Stéphanie Courtel Lionel Hirsch 1 Guillaume Wantz 1
1 ELORGA
IMS - Laboratoire de l'intégration, du matériau au système : UMR 5218
Abstract : In organic photovoltaic (PV) devices based on solution-processed small molecules, we report here that the physicochemical properties of the substrate are critical for achieving high-performances organic solar cells. Three different substrates were tested: ITO coated with PEDOT:PSS, ZnO sol-gel, and ZnO nanoparticles. PV performances are found to be low when the ZnO nanoparticles layer is used. This performance loss is attributed to the formation of many dewetting points in the active layer, because of a relatively high roughness of the ZnO nanoparticles layer, compared to the other layers. We successfully circumvented this phenomenon by adding a small quantity of polystyrene (PS) in the active layer. The introduction of PS improves the quality of film forming and reduces the dark currents of solar cells. Using this method, high-efficiency devices were achieved, even in the case of substrates with higher roughness.
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https://hal.archives-ouvertes.fr/hal-01280407
Contributor : Sylvain Chambon Connect in order to contact the contributor
Submitted on : Monday, February 29, 2016 - 3:01:38 PM
Last modification on : Wednesday, November 17, 2021 - 9:48:04 AM

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Elodie Destouesse, Sylvain Chambon, Stéphanie Courtel, Lionel Hirsch, Guillaume Wantz. Solution-Processed Small-Molecule Bulk Heterojunctions: Leakage Currents and the Dewetting Issue for Inverted Solar Cells. ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2015, 7 (44), pp.24663-24669. ⟨10.1021/acsami.5b06964⟩. ⟨hal-01280407⟩

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