Laminated Carbon Nanotubes for the Facile Fabrication of Cost-Effective Polymer Solar Cells

Laminated Carbon Nanotubes for the Facile Fabrication of Cost-Effective Polymer Solar Cells

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Abstract and figures:

In this study, we fabricate a metal- and vacuum-free electrode composed of aligned multiwall carbon nanotubes (MWCNTs) as top electrode in inverted type polymer solar cells. Simply drawn MWCNT sheets from vertically grown arrays were directly transferred over the top layer (PEDOT:PSS) of the device as an anode material. Without any post treatment, devices exhibited a short-circuit current density (Jsc) of 7.53 mA cm–2, which is 78% of that of devices employing a thermally deposited silver-based anode (Jsc = 9.69 mA cm–2). Scanning electron microscopy images of the device (top and cross-sectional views) show the successful incorporation of MWCNT sheets over the surface of the device without any damage. The thickness of the MWCNT sheets as top electrode is also investigated, and it has been demonstrated that when the sheets’ thickness increased, the conductance of the electrode increased, which showed improvement for the device performance. The attributes of being flexible, vacuum-free, and stable with regard to environmental factors may lead this idea to become a versatile approach toward cost-effective roll-to-roll production of environmentally friendly polymer solar cells.

SUBJECT: laminated carbon nanotubes, vacuum-free, cost-effective, electrode fabrication, flexible polymer solar cells

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Caption Table 1 . Photovoltaic Parameters of Polymer Solar Cells with Different Sheet Thicknesses of MWCNTs and Silver as Top Electrodes

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Caption Figure 1. (a, b) Schematic illustration and optical image of inverted type polymer solar cell with MWCNT sheets as top electrode; (c) crosssectional and (d) top view of the device with laminated MWCNT electrode via SEM.

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Caption Figure 2. SEM images of (a) ZnO nanoparticles and (b) MWCNT sheet over device surface; (c, d) low-and high-magnification SEM images of vertically aligned MWCNT arrays; (e, f) optical images of MWCNT sheet extracted from arrays and MWCNT sheet on a plastic substrate with bending.

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Caption Figure 5. Electrochemical impedance spectroscopy of inverted type polymer solar cells with MWCNTs and silver as top electrode. Frequencies ranged from 0.1 to 1 MHz with 0.1 V DC voltage under dark conditions.

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Caption Figure 6. (a) Optical image of bending PET/ITO-based inverted polymer solar cell with MWCNTs as top electrode, (b) efficiency ratio after different bending cycles, (c) J−V curves of the device with time, and (d) efficiency ratio with respect to different time intervals.

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