scholarly journals ZnO-CuO core-shell heterostructure for improving the efficiency of ZnO-based dye-sensitized solar cells

MRS Advances ◽  
2017 ◽  
Vol 2 (15) ◽  
pp. 857-862 ◽  
Author(s):  
Kichang Jung ◽  
Taehoon Lim ◽  
Yaqiong Li ◽  
Alfredo A. Martinez-Morales
Keyword(s):  
Solar Cells ◽  
Thermal Oxidation ◽  
Conversion Efficiency ◽  
Seed Layer ◽  
Near Infrared ◽  
Zno Nanorods ◽  
Dye Sensitized Solar Cells ◽  
Core Shell ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

ABSTRACTIn this work, the integration of ZnO-CuO core-shell nanostructures shows improvement in the conversion efficiency of ZnO-based dye-sensitized solar cells (DSSCs). This is due to CuO acting as a secondary absorption layer that allows the absorption of near-infrared (NIR) light increasing the generated photocurrent in the device, and as a blocking layer that reduces electron-hole recombination. The ZnO core and encapsulating CuO shell are synthesized through chemical vapor deposition (CVD), and thermal oxidation of a Cu seed layer, respectively. The crystallinity of the synthesized ZnO and CuO is analyzed by X-ray diffraction (XRD). Scanning electron microscope (SEM) images show the change in morphology through the steps of Cu seed layer deposition and thermal oxidation of this layer. To determine optical properties of CuO on ZnO nanorods, UV-Vis-NIR photospectrocopy is used. The comparison of conversion efficiency of DSSCs using two different photoelectrodes (i.e. ZnO nanorods versus ZnO-CuO core-shell nanostructure) is performed by I-V measurements.

Design of efficient dye-sensitized solar cells with patterned ZnO–ZnS core–shell nanowire array photoanodes

Nanoscale ◽  
2014 ◽  
Vol 6 (9) ◽  
pp. 4691-4697 ◽  
Author(s):  
Xiang Chen ◽  
Zhiming Bai ◽  
Xiaoqin Yan ◽  
Haoge Yuan ◽  
Guangjie Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
Light Harvesting ◽  
Nanowire Array ◽  
Dye Sensitized Solar Cells ◽  
Core Shell ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

The light-harvesting ability and conversion efficiency of DSSCs can be significantly improved with the use of patterned ZnO–ZnS core–shell nanowire array photoanodes.

Near-infrared absorbing porphyrin dyes with perpendicularly extended π-conjugation for dye-sensitized solar cells

RSC Advances ◽  
2014 ◽  
Vol 4 (92) ◽  
pp. 50897-50905 ◽  
Author(s):  
Wenhui Li ◽  
Zonghao Liu ◽  
Xiaobao Xu ◽  
Yi-Bing Cheng ◽  
Zhixin Zhao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Near Infrared ◽  
Dye Sensitized Solar Cells ◽  
Energy Conversion Efficiency ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Two new near-infrared porphyrins exhibited energy conversion efficiency of 7.21% in dye-sensitized solar cells.

Effect of ZnO Seed Layer and TiO2 Coating Treatments on Aligned TiO2/ZnO Nanostructures for Dye-Sensitized Solar Cells

2013 ◽  
Vol 479-480 ◽  
pp. 69-74
Author(s):  
Lung Chuan Chen ◽  
Jean Hong Chen ◽  
Shuei Feng Tsai ◽  
Guan Wen Wang
Keyword(s):  
Solar Cells ◽  
Seed Layer ◽  
Zno Nanorods ◽  
Dye Sensitized Solar Cells ◽  
Atomic Ratio ◽  
Band Gap Energy ◽  
Zno Nanostructures ◽  
Dye Sensitized ◽  
Cbd Method ◽  
Sensitized Solar Cells

A chemical bath deposition (CBD) method was applied to grow zinc oxide nanorod arrays on transparent conductive oxides acting as templates for the synthesis of TiO2/ZnO nanostructures (TiO2/ZNR) followed by HCl etching, and then these nanostructures were assembled as anodes in dye-sensitized solar cells. The ZnO nanorods, predominantly grew with good crystallinity along c-axis, exhibit wurtzite structure with smooth surface. Etching of the TiO2/ZNR by HCl changes the most preferential crystal plane of ZnO from (002) to (100) and significantly increases the atomic ratio of Ti/Zn. Optical absorption measurements indicate a band gap energy of 3.1 eV for ZNR and TiO2/ZNR. Increasing the spin coating time (SCT) of TiO2on ZNR increases the PL intensity. The seed layer number (SLN) of ZnO exerts moderate influence on the photo-to-electricity conversion and an optimum SLN was observed for this study.

Preparation and Photovoltaic Properties of Dye Sensitized Solar Cells Using ZnO Nanorods Stacking Films on AZO Substrate as Photoanode

2016 ◽  
Vol 16 (4) ◽  
pp. 3622-3627
Author(s):  
Yang Xu ◽  
Xina Wang ◽  
Rong Liu ◽  
Hao Wang
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
Zno Nanorods ◽  
Dye Sensitized Solar Cells ◽  
Growth Time ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Light Power ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Three-dimensional stacking of ZnO nanorods on conducting aluminum-doped ZnO (AZO) glass were studied as efficient photoanodes of dye sensitized solar cells (DSSCs). By changing hydrothermal growth time and cycle times, the thickness of ZnO nanorods stacking films varied from 30 μm to 64 μm, and its influence on the energetic conversion efficiency of the DSSCs based on the stacking films photoanodes was investigated. The loading density of N719 on the surface of ZnO nanorods was studied to increase the efficiency of the cells. Annealing experiments showed that the AZO substrates remained good conductors until heated above 350 °C. A photoelectric conversion efficiency as high as ∼2.0% together with Isc of ∼9.5 mA/cm2, Voc of ∼0.5 V and FF of ∼41.4% was achieved for the DSSC using 50 μm-thick film stacking by ZnO nanorods as photoanode and N719 as sensitizer under illumination of AM1.5G solar light (power density of 100 mW/cm2). A charge separation and transfer mechanism was proposed for the ZnO nanorods stacking electrode-based DSSCs.

scholarly journals On the assessment of incorporation of CNT–TiO2 core–shell structures into nanoparticle TiO2 photoanodes in dye-sensitized solar cells

2019 ◽  
Vol 18 (7) ◽  
pp. 1840-1850 ◽  
Author(s):  
H. M. Ghartavol ◽  
M. R. Mohammadi ◽  
A. Afshar ◽  
Y. Li
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Dye Sensitized Solar Cells ◽  
Shell Structures ◽  
Core Shell ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Core–shell nanotubes were synthesized by in situ deposition of TiO2 on non-covalently functionalized CNTs. TiO2 photoanodes decorated with TiO2@CNT showed an increase of 37% in the device's power conversion efficiency.

Broad-absorbing tetrabenzocorrolazine green photosensitizer for the enhanced conversion efficiency in dye-sensitized solar cells

2016 ◽  
Vol 20 (07) ◽  
pp. 804-812
Author(s):  
Jun Choi ◽  
Woosung Lee ◽  
Jae P. Kim
Keyword(s):  
Solar Cells ◽  
Solar Energy ◽  
Conversion Efficiency ◽  
Near Infrared ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
The Novel ◽  
Additional Absorption ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Novel tetrabenzocorrolazine green photosensitizer was designed and synthesized to enhance the solar energy-to-electricity conversion efficiency of dye-sensitized solar cells. This near-infrared absorbing dye exhibited superior short-circuit photocurrent density induced from the additional absorption compared to the phthalocyanine dye commonly applied as a photosensitizer covering the near-infrared region in dye-sensitized solar cells. The introduction of bulky peripheral groups and axial substituents to the novel dye led to the increase of open-circuit photovoltage. As a result, the novel tetrabenzocorrolazine dye achieved a solar energy-to-electricity conversion efficiency of 3.78% under AM 1.5G conditions which was much higher than that of the phthalocyanine reference dye.

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