Cove‐Edge Nanoribbon Materials for Efficient Inverted Halide Perovskite Solar Cells. Issue 46 (17th October 2017)

• Record Type: Journal Article
• Authors: Castro, Edison; Sisto, Thomas J.; Romero, Elkin L.; Liu, Fang; Peurifoy, Samuel R.; Wang, Jue; Zhu, Xiaoyang; Nuckolls, Colin; Echegoyen, Luis
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 46(2017)
• Page Start: 14648
• Page End: 14652
• Publication Date: 2017-10-17
• Subjects: electron-transporting materials -- nanoribbons -- perovskite -- photoluminescence -- solar cells; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201706895
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Two cove‐edge graphene nanoribbons hPDI2‐Pyr‐hPDI2 (1 ) and hPDI3‐Pyr‐hPDI3 (2 ) are used as efficient electron‐transporting materials (ETMs) in inverted planar perovskite solar cells (PSCs). Devices based on the new graphene nanoribbons exhibit maximum power‐conversion efficiencies (PCEs) of 15.6 % and 16.5 % for1 and2, respectively, while a maximum PCE of 14.9 % is achieved with devices based on [6, 6]‐phenyl‐C61 ‐butyric acid methyl ester (PC61 BM). The interfacial effects induced by these new materials are studied using photoluminescence (PL), and we find that1 and2 act as efficient electron‐extraction materials. Additionally, compared with PC61 BM, these new materials are more hydrophobic and have slightly higher LUMO energy levels, thus providing better device performance and higher device stability. Abstract : Blue (nano)ribbon solar cells : Two electron‐deficient graphene nanoribbons are used as the electron‐transporting materials (ETMs) in inverted perovskite solar cells (PSCs). The nanoribbons provide improved performance over the commonly used PC61 BM. The most important benefits are the improved PCE (>10 % over PC61 BM) and improved device lifetime owing to the hydrophobic nature of the solubilizing chains on the ribbons.