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Flexible Dye-Sensitized Solar Cell Based on Vertical ZnO Nanowire Arrays

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ABSTRACT

Flexible dye-sensitized solar cells are fabricated using vertically aligned ZnO nanowire arrays that are transferred onto ITO-coated poly(ethylene terephthalate) substrates using a simple peel-off process. The solar cells demonstrate an energy conversion efficiency of 0.44% with good bending tolerance. This technique paves a new route for building large-scale cost-effective flexible photovoltaic and optoelectronic devices.

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a A schematic view of the flexible DSSC. b Photocurrent density–photovoltage (J–V) curves of the ZnO nanowire array DSSC without illumination (dotted line), under illumination without bending (solid line), and with bending (dash line) with a bending radius ~5 mm. c The quantum efficiency of ZnO nanowire array DSSC with/without mechanical deformation.
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Figure 3: a A schematic view of the flexible DSSC. b Photocurrent density–photovoltage (J–V) curves of the ZnO nanowire array DSSC without illumination (dotted line), under illumination without bending (solid line), and with bending (dash line) with a bending radius ~5 mm. c The quantum efficiency of ZnO nanowire array DSSC with/without mechanical deformation.

Mentions: Figure 3a illustrates a schematic view of the completed ZnO nanowire array-based flexible DSSC. The photovoltaic properties are characterized under a simulated AM1.5G illumination (standard 100 mW/cm2) where a light radiation is introduced to the active dye from the side of the Pt/ITO-PET transparent electrode. Figure 3b shows the photocurrent density versus photovoltage (J–V) curves of the device. Without any mechanical bending (solid curve), the device exhibits a short-circuit current density (JSC) of 2.73 mA/cm2, open-circuit voltage (VOC) of 0.40 V, and a filling factor (FF) of 40%. The corresponding power conversion efficiency (η) is calculated to be 0.44%, comparable to recently reported ZnO nanowire-based DSSC [26,27]. The dashed curve shown in Figure 3b is the device under a strong bending (bending radius ~5 mm), resulting in a reduced JSC (1.15 mA/cm2), FF (26%), and an efficiency of 0.11%, whereas VOC remains the same. Although the performance of non-bending solar cell is stable, the J–V curves vary with different forces and angels. The reduction in efficiency upon bending is attributed to the loss of light absorption and induced mechanical defects. Bending will naturally deteriorate the non-perfect contact between Ag paste and ZnO, as well as of the top contact, thus increasing the series resistance in the solar cell. Furthermore, the Pt film on ITO substrate is not continuous and could likely be removed upon bending, subsequently decreasing the efficiency of redox reaction in the electrolyte.


Flexible Dye-Sensitized Solar Cell Based on Vertical ZnO Nanowire Arrays
a A schematic view of the flexible DSSC. b Photocurrent density–photovoltage (J–V) curves of the ZnO nanowire array DSSC without illumination (dotted line), under illumination without bending (solid line), and with bending (dash line) with a bending radius ~5 mm. c The quantum efficiency of ZnO nanowire array DSSC with/without mechanical deformation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211473&req=5

Figure 3: a A schematic view of the flexible DSSC. b Photocurrent density–photovoltage (J–V) curves of the ZnO nanowire array DSSC without illumination (dotted line), under illumination without bending (solid line), and with bending (dash line) with a bending radius ~5 mm. c The quantum efficiency of ZnO nanowire array DSSC with/without mechanical deformation.
Mentions: Figure 3a illustrates a schematic view of the completed ZnO nanowire array-based flexible DSSC. The photovoltaic properties are characterized under a simulated AM1.5G illumination (standard 100 mW/cm2) where a light radiation is introduced to the active dye from the side of the Pt/ITO-PET transparent electrode. Figure 3b shows the photocurrent density versus photovoltage (J–V) curves of the device. Without any mechanical bending (solid curve), the device exhibits a short-circuit current density (JSC) of 2.73 mA/cm2, open-circuit voltage (VOC) of 0.40 V, and a filling factor (FF) of 40%. The corresponding power conversion efficiency (η) is calculated to be 0.44%, comparable to recently reported ZnO nanowire-based DSSC [26,27]. The dashed curve shown in Figure 3b is the device under a strong bending (bending radius ~5 mm), resulting in a reduced JSC (1.15 mA/cm2), FF (26%), and an efficiency of 0.11%, whereas VOC remains the same. Although the performance of non-bending solar cell is stable, the J–V curves vary with different forces and angels. The reduction in efficiency upon bending is attributed to the loss of light absorption and induced mechanical defects. Bending will naturally deteriorate the non-perfect contact between Ag paste and ZnO, as well as of the top contact, thus increasing the series resistance in the solar cell. Furthermore, the Pt film on ITO substrate is not continuous and could likely be removed upon bending, subsequently decreasing the efficiency of redox reaction in the electrolyte.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Flexible dye-sensitized solar cells are fabricated using vertically aligned ZnO nanowire arrays that are transferred onto ITO-coated poly(ethylene terephthalate) substrates using a simple peel-off process. The solar cells demonstrate an energy conversion efficiency of 0.44% with good bending tolerance. This technique paves a new route for building large-scale cost-effective flexible photovoltaic and optoelectronic devices.

No MeSH data available.


Related in: MedlinePlus