Format

Send to

Choose Destination
Phys Chem Chem Phys. 2017 Jun 14;19(23):15207-15214. doi: 10.1039/c7cp01326d.

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

Author information

1
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China. guowb@jlu.edu.cn.

Abstract

In this contribution, a series of conducting polyfluorenes (PF) are introduced to improve interface adhesion and boost charge extraction of the TiO2 electron transport layer of 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, interfacial coherence improvement and energy loss decrease are both achieved, facilitating charge transfer from the active layer to the TiO2 layer. The optimized contact, enhanced electrical conductivity, and reduced internal resistance contribute to increased short-circuit current density and fill factor, leading to an enhanced power conversion efficiency (PCE) from 5.72% up to 7.97%. The employment of the PF capping TiO2 buffer layer provides a promising approach to develop high efficiency PSCs.

PMID:
28561846
DOI:
10.1039/c7cp01326d

Supplemental Content

Full text links

Icon for Royal Society of Chemistry
Loading ...
Support Center