N-type semiconducting perylene diimide based molecules for organic solar cells. Issue 1733 (29th January 2015)

• Record Type: Journal Article
• Authors: Seferos, D.; Kozycz, L.; Kotowski, D.; Luzzati, S.; Kozma, E.; Catellani, M.
• Is Part Of: MRS proceedings. Issue 1733:(2015)
• Publication Date: 2015-01-29
• Subjects: Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2015.16
• Languages: English
• ISSNs: 0272-9172

Abstract

<abstract abstract-type="normal"> <title>ABSTRACT</title> <p>Core substituted perylene diimides (PDIs) are promising candidates as non-fullerene acceptor materials for organic solar cells. The functionalization of PDIs in the bay positions using chemical groups with different electron donating abilities and with steric hindrance is a versatile tool to modify both the optoelectronic properties and the morphology in the solid state.</p> <p>Herein we present two new PDI based molecules having bulky aromatic substituents linked into the bay positions: <bold>PDI-SF</bold> with spirobifluorene group and <bold>PDI-BSF</bold> with bithienyl-spirobifluorene moieties. The high steric hindrance of spirobifluorene reduce the tendency to form aggregates that has been identified as a limiting factor for the photovoltaic performances in PDI based solar cells.</p> <p>The PDI molecules were tested as electron acceptors in bulk heterojunction solar cells with P3HT as electron donor. Power conversion efficiencies (PCE) of 1.58% and 1.18% were obtained for <bold>PDI-SF</bold> and <bold>PDI-BSF</bold> devices.</p> </abstract>