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Interface passivation and electron transport improvement of polymer solar cells through embedding a polyfluorene layer

Abstract

In this contribution, a series of conducting polyfluorenes (PF) are introduced to improve interface adhesion and boost charge extraction of TiO2 electron transport layer for inverted polymer solar cells (PSCs). After employing poly (9,9-dihexylfluorenyl-2,7-diyl) (PDF), poly[(9,9-dioctylfluorenyl-2,7-diyl) -alt-co-(1,4-benzo-{2,1´,3}-thiadiazole)] (PDFBT), and poly[(4-(5-(7-methyl-9,9-dioctyl-9H-fluoren-2-yl) thiophen-2-yl)-7-(5-methylthiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PFTBT) as capping layers, the interfacial coherence improvement and energy loss decrease are both achieved, facilitating charge transfer from active layer to TiO2 layer. The optimized contact, enhanced electrical conductivity, and reduced internal resistance contribute to increase short-circuit current density and fill factor, leading to the enhanced power conversion efficiency (PCE) from 5.72% up to 7.97%. The employment of PF capping TiO2 buffer layer provides a promising approach to develop high efficiency PSCs.

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Publication details

The article was received on 01 Mar 2017, accepted on 12 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7CP01326D
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Interface passivation and electron transport improvement of polymer solar cells through embedding a polyfluorene layer

    W. Guo, S. Li, Z. Li, C. Liu, X. Zhang, Z. Zhang, L. Shen, S. Ruan and L. Zhang, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP01326D

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