Polar side-chain tuning of perylene diimide and fluorene-based cathode interfacial material for high-performance inverted perovskite solar cells. (4th January 2023)

• Record Type: Journal Article
• Authors: Wu, Tao; Wang, Daizhe; Jiang, Xingjian; Guo, Fengyun; Ye, Tengling; Gao, Shiyong; Zhang, Yong
• Is Part Of: Materials chemistry frontiers. Volume 7:Number 3(2023)
• Page Start: 483
• Page End: 489
• Publication Date: 2023-01-04
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/d2qm01088g
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : Cathode interface layers (CILs) play an important role in inverted perovskite solar cells (PVSCs) to correct the mismatched energy levels, improve electron extraction, and passivate interfacial defects. Abstract : Cathode interface layers (CILs) play an important role in inverted perovskite solar cells (PVSCs) to correct the mismatched energy levels, improve electron extraction, and passivate interfacial defects. Herein, we reported a perylene diimide (PDI) and fluorene-based CIL material 2PDINT-FN with four dimethylamino functional side chains for highly efficient inverted PVSCs. The dimethylamino groups in both PDI and fluorene side chains endow 2PDINT-FN with high electrical conductivity, electron mobility, strong self-doping and interfacial dipole properties, which were further enhanced by adding N-DMBI as the dopant. The inverted PVSCs with 2PDINT-FN as a CIL showed a promising power conversion efficiency (PCE) of 20.03%, which was further improved to 21.85% with a simultaneously enhanced current density ( J sc ) and fill factor (FF) after adding the N-DMBI dopant. A detailed analysis indicates that the defect density and charge recombination at the interface can be reduced effectively after adding the 2PDINT-FN CIL, leading to an improvement of charge collection and extraction efficiency.