Enhanced Charge Collection in Non‐Fullerene Organic Solar Cells Using Iridium Complex as an Electron Extraction Layer. Issue 19 (13th September 2021)

• Record Type: Journal Article
• Authors: Zhou, Pengchao; Liu, Yuling; Gu, Jialu; Lian, Hong; Lan, Weixia; Liao, Yingjie; Pu, Huayan; Wei, Bin
• Is Part Of: Advanced materials interfaces. Volume 8:Issue 19(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-13
• Subjects: electron extraction layers -- FIrpic -- iridium complex -- organic photovoltaics; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202100850
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Ultrathin iridium (Ir) complexes (e.g., bis[2‐(4, 6‐difluorophenyl)pyridinato‐C2, N](picolinato)iridium(III) (FIrpic)) are first introduced as electron extraction layers (EELs) in non‐fullerene organic photovoltaics (OPVs), and a set of devices based on non‐fullerene materials is fabricated. It is demonstrated that this approach can rationally enhance the corresponding short current density and open circuit voltage and finally improve the photovoltaic performance of OPVs. Furthermore, optimized bilayer EELs using combined FIrpic and 8‐hydroxyquinoline lithium (Liq) are investigated. The resulting device presents excellent power conversion efficiency (PCE) of 15.85%, which is much higher than that of control device without FIrpic layer (14.6%). Moreover, Ir complexes show great universality when combined with other materials serving as EELs. This may provide an extra direction for further enhancement of OPVs performance. Abstract : Varying thickness of Iridium(Ir) complexes (e.g., bis[2‐(4, 6‐difluorophenyl)pyridinato‐C2, N](picolinato)iridium(III) (FIrpic)) is used as electron extraction layers (EELs) based on non‐fullerene organic photovoltaics (OPVs). The optimal thickness of FIrpic rationally enhances the corresponding short current density ( J sc ) and open circuit voltage ( V oc ) and finally improves the photovoltaic performance of OPVs. Moreover, Ir complexes show universality in combining with other materials serving as EELs.