Triarylphosphine Oxide as Cathode Interfacial Material for Inverted Perovskite Solar Cells. Issue 12 (8th May 2019)

• Record Type: Journal Article
• Authors: Wang, Kai; Neophytou, Marios; Aydin, Erkan; Wang, Mingcong; Laurent, Thomas; Harrison, George T.; Liu, Jiang; Liu, Wenzhu; De Bastiani, Michele; Khan, Jafar I.; Anthopoulos, Thomas D.; Laquai, Frédéric; De Wolf, Stefaan
• Is Part Of: Advanced materials interfaces. Volume 6:Issue 12(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-05-08
• Subjects: cathode interlayer -- interface engineering -- organic molecule -- p‐i‐n perovskite solar cell -- semitransparent solar cell; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201900434
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Metal halide perovskite solar cells (PSCs) in the inverted planar p‐i‐n configuration often employ phenyl‐C61‐butyric acid methyl ester (PC61 BM) as electron transport layer, onto which Ag is deposited as outer electrode. However, the energy offset between PC61 BM and Ag imposes an energy barrier for electron extraction. In this work, to improve the contact quality of this stack, a small organic molecule (2‐(1, 10‐phenanthrolin‐3‐yl)naphth‐6‐yl)diphenylphosphine oxide (DPO) as a cathode interfacial material (CIM), inserted between PC61 BM and Ag, is introduced. In devices with the indium tin oxide (ITO)/NiO x /methylammonium lead iodide (MAPbI3 )/PC61 BM/CIM/Ag configuration, it is found that this results in fill factor (FF) and short‐circuit current density values ( J SC ) that are up to ≈34% and ≈1 mA cm −2 higher, respectively, compared to DPO‐free devices. Inserting additional thin ZnO nanoparticle layers further improves the contact quality, leading to a power conversion efficiency of 18.2%. Semitransparent PSCs, utilizing DPO as an interlayer buffer layer are also realised. Resultant devices exhibit improved performance compared to DPO‐free devices. This proves that DPO withstands the sputtering of ITO, and may thus find application in perovskite‐based tandem devices. It is concluded that DPO acts as an excellent cathode modifier, opening new device‐engineering opportunities for p‐i‐n PSCs, especially in their semitransparent implementation. Abstract : The small organic molecule (2‐(1, 10‐phenanthrolin‐3‐yl)naphth‐6‐yl)diphenylphosphine oxide is explored as cathode interfacial material to reduce the extraction barrier between phenyl‐C61‐butyric acid methyl ester and Ag. With the better contact quality thanks to this molecule, both opaque and semitransparent p‐i‐n perovskite solar cell achieve improved performance and stability.