Copper phosphotungstate as low cost, solution-processed, stable inorganic anode interfacial material enables organic photovoltaics with over 18% efficiency. (April 2022)

• Record Type: Journal Article
• Authors: Yu, Jiangsheng; Liu, Xin; Zhong, Ziping; Yan, Cenqi; Liu, Heng; Fong, Patrick W.K.; Liang, Qiong; Lu, Xinhui; Li, Gang
• Is Part Of: Nano energy. Volume 94(2022)
• Publication Date: 2022-04
• Subjects: Copper phosphotungstate -- Anode interfacial layer -- Non-halogenated solvent -- Organic photovoltaics -- Organic light-emitting diodes; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.106923
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: The performance and lifespan of organic photovoltaics (OPVs) and organic light-emitting diodes (OLEDs) are highly dependent on the properties of anode interfacial layers (AILs). In this work, a low cost, methanol processed copper phosphotungstate (Cu003) as AIL is developed for OPVs and OLEDs. The Cu003 film features an optical bandgap of 3.9 eV, a work function of 5.08 eV, and a hole mobility of 9.78 × 10 -4 cm 2 V -1 s -1 . Cu003 AIL exhibits superior stability, higher transmittance and carrier extraction capacity than PEDOT:PSS, and induces better optoelectronic field intensity distribution, contributing to exciton generation and recombination inhibition. Therefore, non-halogenated solvent processed OPVs incorporating Cu003 AIL and PM6:BTPBO-4Cl active layer afford a high efficiency of 17.6%, with an outstanding fill factor of 79.6%, exceeding those with PEDOT:PSS. Moreover, the device based on Cu003/PM6:BTP-eC9:PC71 BM affords a remarkable efficiency of 18.2%. The flexible OPVs and OLEDs incorporating Cu003 AIL are also successfully demonstrated. Our research shows that the inorganic Cu003 AIL is stable, low-cost, ecologically friendly, and facile-processing for organic electronics. Graphical Abstract: ga1 Highlights: Low cost copper phosphotungstate (Cu003) is developed as anode interfacial layer. Transparent Cu003 AIL exhibits superior stability and carrier extraction capacity. A remarkable efficiency of 18.2% is achieved for Cu003 based organic photovoltaics. The flexible OPVs and OLEDs incorporating Cu003 AIL are successfully demonstrated.