scholarly journals Annealing Effect on Photovoltaic Performance of CdSe Quantum-Dots-Sensitized TiO2Nanorod Solar Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Yitan Li ◽  
Lin Wei ◽  
Ruizi Zhang ◽  
Yanxue Chen ◽  
Jun Jiao
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Photovoltaic Performance ◽  
Annealing Treatment ◽  
Annealing Effect ◽  
Cdse Quantum Dots ◽  
Nanorod Arrays ◽  
Large Area ◽  
Photovoltaic Properties

Large area rutile TiO2nanorod arrays were grown on F:SnO2(FTO) conductive glass using a hydrothermal method at low temperature. CdSe quantum dots (QDs) were deposited onto single-crystalline TiO2nanorod arrays by a chemical bath deposition (CBD) method to make a photoelectrode. The solar cell was assembled using a CdSe-TiO2nanostructure as the photoanode and polysulfide solution as the electrolyte. The annealing effect on optical and photovoltaic properties of CdSe quantum-dots-sensitized TiO2nanorod solar cells was studied systematically. A significant change of the morphology and a regular red shift of band gap of CdSe nanoparticles were observed after annealing treatment. At the same time, an improved photovoltaic performance was obtained for quantum-dots-sensitized solar cell using the annealed CdSe-TiO2nanostructure electrode. The power conversion efficiency improved from 0.59% to 1.45% as a consequence of the annealing effect. This improvement can be explained by considering the changes in the morphology, the crystalline quality, and the optical properties caused by annealing treatment.

scholarly journals Enhanced Photovoltaic Properties of the Solar Cells Based on Cosensitization of CdS and Hydrogenation

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Hongcai He ◽  
Kui Yang ◽  
Shuangshuang Ren ◽  
Tao Liu ◽  
Ning Wang
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Photovoltaic Performance ◽  
Visible Region ◽  
Cds Nanoparticles ◽  
Cds Quantum Dots ◽  
Silar Method ◽  
Photovoltaic Properties ◽  
Enhanced Absorption

The hydrogenated TiO2porous nanocrystalline film is modified with CdS quantum dots by successive ionic layer adsorption and reaction (SILAR) method to prepare the cosensitized TiO2solar cells by CdS quantum dots and hydrogenation. The structure and topography of the composite photoanode film were confirmed by X-ray diffraction and scanning electron microscopy. With deposited CdS nanoparticles, UV absorption spectra of H:TiO2photoanode film indicated a considerably enhanced absorption in the visible region. The cosensitized TiO2solar cell by CdS quantum dots and hydrogenation presents much better photovoltaic properties than either CdS sensitized TiO2solar cells or hydrogenated TiO2solar cells, which displays enhanced photovoltaic performance with power conversion efficiency (η) of 1.99% (Jsc=6.26 mA cm−2,Voc=0.65 V, and FF = 0.49) under full one-sun illumination. The reason for the enhanced photovoltaic performance of the novel cosensitized solar cell is primarily explained by studying the Nyquist spectrums, IPCE spectra, dark current, and photovoltaic performances.

Effect of CdSe quantum dots on the performance of hybrid solar cells based on ZnO nanorod arrays

2013 ◽  
Vol 39 (3) ◽  
pp. 2975-2980 ◽  
Author(s):  
Chongyu Zhu ◽  
Xinhua Pan ◽  
Chunli Ye ◽  
Lei Wang ◽  
Zhizhen Ye ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Cdse Quantum Dots ◽  
Zno Nanorod ◽  
Hybrid Solar Cells ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays

scholarly journals CdSe Quantum Dots for Solar Cell Devices

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
A. B. Kashyout ◽  
Hesham M. A. Soliman ◽  
Marwa Fathy ◽  
E. A. Gomaa ◽  
Ali A. Zidan
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Wide Bandgap ◽  
Solar Irradiation ◽  
Cdse Quantum Dots ◽  
Solar Cell Performance ◽  
Organometallic Reagents ◽  
Uv Visible

CdSe quantum dots have been prepared with different sizes and exploited as inorganic dye to sensitize a wide bandgap TiO2thin films for QDs solar cells. The synthesis is based on the pyrolysis of organometallic reagents by injection into a hot coordinating solvent. This provides temporally discrete nucleation and permits controlled growth of macroscopic quantities of nanocrystallites. XRD, HRTEM, UV-visible, and PL were used to characterize the synthesized quantum dots. The results showed CdSe quantum dots with sizes ranging from 3 nm to 6 nm which enabled the control of the optical properties and consequently the solar cell performance. Solar cell of 0.08% performance under solar irradiation with a light intensity of 100 mW/cm2has been obtained. CdSe/TiO2solar cells without and with using mercaptopropionic acid (MPA) as a linker between CdSe and TiO2particles despite aVocof 428 mV,Jscof 0.184 mAcm-2, FF of 0.57, andηof 0.05% but with linker despite aVocof 543 mV,Jscof 0.318 mAcm-2, FF of 0.48, andηof 0.08%, respectively.

Preparation of B-doped Si quantum dots embedded in SiNx films for Si quantum dot solar cells

2018 ◽  
Vol 32 (02) ◽  
pp. 1850003
Author(s):  
Xiaobo Chen ◽  
Peizhi Yang
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Photovoltaic Performance ◽  
Doping Amount ◽  
Photovoltaic Properties ◽  
Heterojunction Solar Cells ◽  
Si Quantum Dot ◽  
Quantum Dot Solar Cells ◽  
The Matrix ◽  
B Doping

Silicon quantum dots (Si-QDs) embedded B-doped SiN[Formula: see text] films were fabricated by magnetron co-sputtering. The effects of B content on the structural, optical and electrical properties of the films were studied. The study found that the amount of B dopant has no significant effect on the crystallization characteristics of the films. B atoms may be doped in the Si-QDs or exist in the silicon nitride or the interface between Si-QDs and the matrix. PL intensity increases with increasing B content, but increases at first and then decreases. The conductivity as a function of the dopant concentration increases at first from a value of 2.71 × 10[Formula: see text] S/cm to 5.83 × 10[Formula: see text] S/cm until 0.9 at.% and then decreases. By employing B-doped Si-QDs films, Si-QDs/c-Si heterojunction solar cells were fabricated and the effect of B doping concentration on the photovoltaic properties was studied. It was found that, with the increase of B doping amount, the photovoltaic performance is improved, when the B doping amount is 0.9 at.%, the efficiency reaches the highest value of 4.26%.

scholarly journals Enhanced Device Performance of Bulk Heterojunction (BHJ) Hybrid Solar Cells Based on Colloidal CdSe Quantum Dots (QDs) via Optimized Hexanoic Acid-Assisted Washing Treatment

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Alfian F. Madsuha ◽  
Akhmad H. Yuwono ◽  
Nofrijon Sofyan ◽  
Michael Krueger
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Solar Cells ◽  
Solar Cell ◽  
Electron Transport ◽  
Bulk Heterojunction ◽  
Hexanoic Acid ◽  
Cdse Quantum Dots ◽  
Hybrid Solar Cells ◽  
Solar Cell Application

As-synthesized colloidal quantum dots (QDs) are usually covered by an organic capping ligand. These ligands provide colloidal stability by preventing QDs agglomeration. However, their inherent electrical insulation properties deliver a problem for hybrid solar cell application, disrupting charge transfer, and electron transport in conjugated polymer/QDs photoactive blends. Therefore, a surface modification of QDs is crucial before QDs are integrated into solar cell fabrication. In this work, enhancement of power conversion efficiency (PCE) in bulk heterojunction (BHJ) hybrid solar cells based on hexadecylamine- (HDA-) capped CdSe quantum dots (QDs) has been achieved via a postsynthetic hexanoic acid washing treatment. The investigation of the surface modification was performed to find the optimum of washing time and their effect on solar cell devices performance. Variation of washing time between 16 and 30 min has been conducted, and an optimum washing time was found at 22 min, resulting in a high PCE of 2.81%. The efficiency enhancement indicates improved electron transport, contributing in an increased short-circuit current density of solar cell devices.

Galvanic-Cell-Based Synthesis and Photovoltaic Performance of ZnO-CdS Core-Shell Nanorod Arrays for Quantum Dots Sensitized Solar Cells

2014 ◽  
Vol 618 ◽  
pp. 64-68 ◽  
Author(s):  
Le Ha Chi ◽  
Pham Duy Long ◽  
Hoang Vu Chung ◽  
Do Thi Phuong ◽  
Do Xuan Mai ◽  
...  
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Dot ◽  
Photovoltaic Performance ◽  
Galvanic Cell ◽  
Core Shell ◽  
Nanorod Arrays ◽  
Cds Quantum Dot ◽  
Sensitized Solar Cells

Zinc oxide (ZnO) is recognized as one of the most attractive metal oxides because of its direct wide band gap (3.37 eV) and large exciton binding energy (60 meV), which make it promising for various applications in solar cells, gas sensors, photocatalysis and so on. Here, we report a facile synthesis to grow well-aligned ZnO nanorod arrays on SnO2: F (FTO) glass substrates without the ZnO seed layer using a Galvanic-cell-based method at low temperature (<100°C). CdS quantum dot thin films were then deposited on the nanorod arrays in turn by an effective successive ionic layer adsorption and reaction (SILAR) process to form a ZnO/CdS core-shell structure electrode. Structural, morphological and optical properties of the ZnO/CdS nanorod heterojunctions were investigated. The results indicate that CdS quantum dot thin films were uniformly deposited on the ZnO nanorods and the thickness of the CdS shell can be controlled by varying the number of the adsorption and reaction cycles. The number of quantum dots layers affects on photovoltaic performance of the ZnO/CdS core-shell nanorod arrays has been investigated as photoanodes in quantum dots sensitized solar cells.

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