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Oleylamine-Functionalized Graphene Oxide as Electron Block Layer Toward High-Performance and Photo-Stability Fullerene-Free Polymer Solar Cells

Abstract

Oleylamine-functionalized graphene oxide (GOs) has a shallower energy level of conduction band (ECB) and a deeper energy level of the valence band (EVB) compared with common hole extraction layer (HEL) materials, which make up the electron block layer (EBL). Photoluminescence, X-ray photoelectron spectroscopy (XPS) and current density-voltage (J-V) curves with a large reverse bias voltage range and dark condition are used to determine GOs layer play important roles in blocking electron transport into the MoO3/Ag composite anode and prevent MoO3 diffusion into the photoactive layer under light illumination. Meanwhile, the insert GOs between photoactive and HEL, which is enhancement of charge carrier transport and collection and avoid the monomolecular recombination between photoactive layer and HEL. Photovoltaic parameter and the photo-stability measurement of inverted and forward PSCs have shown that introducing GOs has improved the performance and photo-stability of PSCs. When add GOs to the PSCs, the power conversion efficiency (PCE) increase approximately 5% and 4%, and reduces the decay ratio to approximately 50% and 65% of the initial value for the inverted and forward PSCs respectively.

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Supplementary files

Publication details

The article was received on 11 Aug 2017, accepted on 03 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05939F
Citation: Nanoscale, 2017, Accepted Manuscript
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    Oleylamine-Functionalized Graphene Oxide as Electron Block Layer Toward High-Performance and Photo-Stability Fullerene-Free Polymer Solar Cells

    Z. Liu, S. Niu and N. Wang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05939F

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