scholarly journals The Size Effect of TiO2 Hollow Microspheres on Photovoltaic Performance of ZnS/CdS Quantum Dots Sensitized Solar Cell

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1583 ◽  
Author(s):  
Zhen Li ◽  
Libo Yu
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Conversion Efficiency ◽  
Light Harvesting ◽  
Photovoltaic Performance ◽  
Hollow Microspheres ◽  
Cds Quantum Dots ◽  
Strong Light ◽  
Harvesting Efficiency ◽  
Light Harvesting Efficiency

Size controllable TiO2 hollow microspheres (HMS) were synthesized by a carbonaceous spheres (CS) template method. Based on TiO2 HMS, the ZnS/CdS quantum dots (QDs) were loaded to form a ZnS/CdS@TiO2 HMS photoanode for quantum dots sensitized solar cell (QDSSC). The size effects of TiO2 HMS on photovoltaic performance were investigated, and showed that TiO2 HMS with sizes ~560 nm produced the best short-circuit current density (Jsc) of 8.02 mA cm−2 and highest power conversion efficiency (PCE) of 1.83%, showing a better photovoltaic performance than any other QDSSCs based on TiO2 HMS with size ~330 nm, ~400 nm, and ~700 nm. The improvement of photovoltaic performance based on ~560 nm TiO2 HMS which can be ascribed to the enhanced light harvesting efficiency caused by multiple light reflection and strong light scattering of TiO2 HMS. The ultraviolet-visible (UV-vis) spectra and incident photo to the current conversion efficiency (IPCE) test results confirmed that the size of TiO2 HMS has an obvious effect on light harvesting efficiency. A further application of ~560 nm TiO2 HMS in ZnS/PbS/CdS QDSSC can improve the PCE to 2.73%, showing that TiO2 HMS has wide applicability in the design of QDSSCs.

Performance of TiO2 Aggregates-Based Dye Solar Cells

2013 ◽  
Vol 737 ◽  
pp. 137-144 ◽  
Author(s):  
Norani Muti Mohamed ◽  
Siti Nur Azella Zaine
Keyword(s):  
Solar Cells ◽  
Light Scattering ◽  
Water Content ◽  
Calcination Temperature ◽  
Conversion Efficiency ◽  
Light Harvesting ◽  
Dye Solar Cells ◽  
Harvesting Efficiency ◽  
Light Harvesting Efficiency ◽  
20 Nm

TiO2 aggregates-based dye solar cells (DSCs) have gained an increasing interest due to their better light harvesting efficiency as a result of enhanced light scattering effect from the submicron spherical aggregates that can generate more electrons and the high internal surface area for dye chemisorption provided by nanocrystallites which made up the aggregates. Optimized TiO2 aggregates (0.45 µm) composing of nanocrystallites (10-40 nm) with desired physicochemical properties for enhanced overall light conversion efficiency of DSC were synthesized by varying the calcination temperature and water content in the hydrolysis of titanium alkoxide in ethanol. TiO2 aggregates obtained were characterized using FESEM, XRD and UV-Vis spectroscopy. The assembled DSCs were then evaluated using solar simulator under AM 1.5 (100 mW/cm2) simulated sunlight. Nanocrystallites were found to have an increasing size of 12 nm to 36 nm with increasing calcination temperature of 400C to 600C. Sample of aggregates calcined at 500C recorded the highest efficiency (4.456%) as the 20-nm nanocrystallites produced is considered to be the optimum size for dye absorption. With higher water content in the hydrolysis process, the aggregates lose their spherical shapes resulting in lower absorption intensity indicating the occurrence of low light scattering in the TiO2 film. Highest conversion efficiency was observed for DSC that used well-defined spherical TiO2 aggregates composing of 20-nm nanocrystallites which were synthesized using ethanol with low water content (0.9 vol%) followed by calcination at 500C. Thus, optimized TiO2 nanocrystallites which form spherical aggregate is critical in order to improve light harvesting efficiency of DSCs.

Enhancement of the light harvesting efficiency in a dye-sensitized solar cell by a patterned reflector

2013 ◽  
Vol 546 ◽  
pp. 326-330 ◽  
Author(s):  
Jeong-Hwa Kim ◽  
Dae-Hwan Kim ◽  
Kang-Pil Kim ◽  
Dong-Hwan Jeon ◽  
Dae-Kue Hwang
Keyword(s):  
Solar Cell ◽  
Light Harvesting ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized ◽  
Harvesting Efficiency ◽  
Light Harvesting Efficiency

High light harvesting efficiency CuInS2 quantum dots/TiO2/MoS2 photocatalysts for enhanced visible light photocatalytic H2 production

2018 ◽  
Vol 47 (16) ◽  
pp. 5652-5659 ◽  
Author(s):  
Yong-Jun Yuan ◽  
Gaoliang Fang ◽  
Daqin Chen ◽  
Yanwei Huang ◽  
Ling-Xia Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Light Harvesting ◽  
H2 Production ◽  
High Light ◽  
Composite Photocatalysts ◽  
Visible Light Driven ◽  
Cuins2 Quantum Dots ◽  
Harvesting Efficiency ◽  
Light Harvesting Efficiency

High light harvesting efficiency CuInS2 quantum dots/TiO2/MoS2 composite photocatalysts were prepared for visible-light-driven photocatalytic H2 production.

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