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.

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 Enhancement of Schottky Junction Silicon Solar Cell with CdSe/ZnS Quantum Dots Decorated Metal Nanostructures

2021 ◽  
Vol 12 (1) ◽  
pp. 83
Author(s):  
Ha Trang Nguyen ◽  
Thanh Thao Tran ◽  
Vishwa Bhatt ◽  
Manjeet Kumar ◽  
Jinwon Song ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Spectral Response ◽  
Solar Spectrum ◽  
High Energy ◽  
Metal Nanostructures ◽  
Schottky Junction ◽  
Solar Cell Performance ◽  
Au Nps

Recently, in the solar energy society, several key technologies have been reported to meet a grid parity, such as cost-efficient materials, simple processes, and designs. Among them, the assistive plasmonic of metal nanoparticles (MNPs) integrating with the downshifting on luminescent materials attracts much attention. Hereby, Si-based Schottky junction solar cells are fabricated and examined to enhance the performance. CdSe/ZnS quantum dots (QDs) with different gold nanoparticles (Au NPs) sizes were incorporated on a Si light absorbing layer. Due to the light scattering effect from plasmonic resonance, the sole Au NPs layer results in the overall enhancement of Si solar cell’s efficiency in the visible spectrum. However, the back-scattering and high reflectance of Au NPs lead to efficiency loss in the UV region. Therefore, the QDs layer acting as a luminescent downshifter is deployed for further efficiency enhancement. The QDs layer absorbs high-energy photons and re-emits lower energy photons in 528 nm of wavelength. Such a downshift layer can enhance the overall efficiency of Si solar cells due to poor intrinsic spectral response in the UV region. The optical properties of Au NPs and CdSe QDs, along with the electrical properties of solar cells in combination with Au/QD layers, are studied in depth. Moreover, the influence of Au NPs size on the solar cell performance has been investigated. Upon decreasing the diameters of Au NPs, the blueshift of absorbance has been observed, cooperating with QDs, which leads to the improvement of the quantum efficiency in the broadband of the solar spectrum.

Surface Passivation of p-GaTe Layered Crystals for Improved p-GaTe/n-InSe Heterojunction Solar Cells

2010 ◽  
Vol 1268 ◽  
Author(s):  
Krishna C. Mandal ◽  
Sandip Das ◽  
Ramesh Krishna ◽  
Peter G. Muzykov ◽  
Shuguo Ma ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Solar Cell ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
Surface Passivation ◽  
Short Circuit ◽  
Solar Cell Performance ◽  
X Ray ◽  
Heterojunction Solar Cells

AbstractGaTe and GaTe:In single crystals were grown from high purity Ga (7N) and zone refined Te (>7N) precursor materials. InSe thin films were deposited by thermal evaporation onto the sulfur passivated GaTe:In substrates at various substrate temperatures from 450K-550K to fabricate p-GaTe:In/n-InSe heterojunction solar cells. Scanning electron microscopy (SEM), X-ray diffraction (XRD), electron probe microanalysis (EPMA), and X-ray photoelectron spectroscopy (XPS) were used to characterize GaTe:In crystals and InSe thin film surfaces. The current-voltage characteristics of p-GaTe:In/n-InSe solar cells were measured under dark and under illumination of 75mW/cm2. Dark J-V measurements showed that the reverse saturation current density (J0) decreased from 3.8 x 10-6 A/cm2 to 1.5 x 10-9 A/cm2 and the ideality factor was reduced from 2.04 to 1.15 as a result of surface passivation. Under illumination of 75 mW/cm2, the open-circuit voltage (Voc) increased from 0.54V to 0.68V and short-circuit current density (Jsc) increased from 7.19 mA/cm2 to 8.65 mA/cm2 for solar cells with surface passivated GaTe:In substrates, leading to an increased solar cell efficiency of 5.03%. EPMA measurements revealed that the InSe thin films deposited at 550 K on GaTe:In substrates were near stoichiometric with enhanced grain size contributing also to better solar cell performance.

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.

scholarly journals STUDI PREPARASI DAN KARAKTERISASI SEL SURYA BERBASIS TITANIA MELALUI PENYISIPAN LOGAM TEMBAGA (CU) DENGAN BERBAGAI VARIASI MASSA PADA LAPISAN AKTIF TITANIA

2017 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Rita Prasetyowati
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Sol Gel ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
Doctor Blade ◽  
Structure Morphology ◽  
Uv Visible

 Abstrak                 Penelitian ini bertujuan untuk mengetahui pengaruh penyisipan logam tembaga (Cu) dengan berbagai variasi massa terhadap struktur morfologi dan komposisi bahan pada permukaan lapisan titania, absorbansi lapisan titania, resistansi lapisan titania, dan performansi sel surya berbasis titania. Konduktivitas yang dimaksud adalah pengukuran resistansi lapisan. Sedangkan performansi sel surya yang dimaksud adalah tegangan sel surya.                Preparasi lapisan titania-tembaga (TiO2-Cu) menjadi bentuk pasta dilakukan dengan menggunakan metode sol-gel. Pasta titania-tembaga dideposisikan pada elektroda transparan (Indium Tin Oxide) dengan metode doctor blade. Dilakukan lima variasi massa Cu yang disisipkan pada lapisan titania, yaitu 0,050 gram (Sampel 1); 0,075 gram (sampel 2);  0,100 gram (sampel 3); 0,0125 (sampel 4) dan 0,0150 (sampel 5). Masing-masing variasi massa Cu tersebut disisipkan pada 1 gram TiO2. Karakterisasi SEM dan EDS dilakukan pada lapisan titania-tembaga untuk mengetahui struktur morfologi dan komposisi bahan lapisan. Absorbansi lapisan dikarakterisasi dengan menggunakan UV-Visible spektrometer. Pengukuran resistansi lapisan dilakukan dengan menggunakan Jembatan Wheatstone. Sedangkan performansi sel surya dilakukan dengan mengukur tegangan sel surya.Kata kunci : titania, tembaga, morfologi permukaan, absorbansi, resistansi, sel surya Effect of Cu Insertion With Variation Of Mass on Titania Active Layer To Morphological Structure, Resistance, And Solar Cells Performance                                             Abstract            This study aims to determine the effect of insertion of copper (Cu) with a variety of mass to structure morphology and composition of surface layer of titania, absorbance of titania, resistance of titania and solar cell performance based on titania.. Solar cell performance is characterized from voltage of solar cell.                Preparation of titania-copper layer (TiO2-Cu) to form a paste was made using a sol-gel method. Pasta titania-copper deposited on a transparent electrode (Indium Tin Oxide) with a doctor blade method. There were five variations of Cu mass pasted on layers of titania, namely 0,050 grams (Sample 1); 0,075 grams (sample 2); 0,100 grams (3 samples); 0.0125 (sample 4) and 0.0150 (sample 5). Each variation of the mass of Cu is inserted in one gram of TiO2. SEM and EDS characterization performed on layers of titania-copper to know the structure morphology and composition of the titania-copper. Layer absorbance was characterized using UV-Visible spectrometer. Resistance of titania was measured using a Wheatstone bridge. The performance of solar cells measured by measuring the voltage of the solar cell.                Keywords: titania, copper, surface morphology, absorbance, resistance, solar cells

scholarly journals Enhancement of organic solar cell performance by incorporating gold quantum dots (AuQDs) on a plasmonic grating

2020 ◽  
Vol 2 (7) ◽  
pp. 2950-2957 ◽  
Author(s):  
Sopit Phetsang ◽  
Supeera Nootchanat ◽  
Chutiparn Lertvachirapaiboon ◽  
Ryousuke Ishikawa ◽  
Kazunari Shinbo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Quantum Dot ◽  
Organic Solar Cells ◽  
Organic Solar Cell ◽  
Cell Performance ◽  
Solar Cell Performance ◽  
System P ◽  
Plasmonic Grating

The performance of organic solar cells was improved by the effect of a synergistic gold quantum dot/plasmonic grating system.

Energy Relay from an Unconventional Yellow Dye to CdS/CdSe Quantum Dots for Enhanced Solar Cell Performance

ChemPhysChem ◽  
2013 ◽  
Vol 14 (17) ◽  
pp. 4010-4021 ◽  
Author(s):  
Remya Narayanan ◽  
Amrita Das ◽  
Melepurath Deepa ◽  
Avanish Kumar Srivastava
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Cell Performance ◽  
Cdse Quantum Dots ◽  
Solar Cell Performance
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