Improving Charge Transport in PbS Quantum Dot to Al:ZnO Layer by Changing the Size of Quantum Dots in Hybrid Solar Cells

2016 ◽  
Vol 71 (11) ◽  
pp. 1067-1071
Author(s):  
Masood Mehrabian ◽  
Parinaz Abdollahian
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Short Circuit ◽  
Visible Region ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Hybrid Solar Cells ◽  
Photovoltaic Properties ◽  
Photovoltaic Applications ◽  
Pbs Quantum Dots

AbstractPbS Quantum dots and P3HT are promising materials for photovoltaic applications due to their absorption in the NIR and visible region, respectively. Our previous experimental work showed that doping Al to ZnO lattice (Al:ZnO) could efficiently improve the cell performance. In this article, hybrid solar cells containing of two active areas with ITO/Al:ZnO/PbS QDs/P3HT&PCBM/Ag structure were fabricated and the effect of PbS QD size on photovoltaic properties was investigated. Optimised solar cell showed maximum power conversion efficiency of 2.45 % with short-circuit current of 9.36 mA/cm2 and open-circuit voltage of 0.59 V under 1 sun illumination (AM1.5).

scholarly journals Direct AFM-based nanoscale mapping and tomography of open-circuit voltages for photovoltaics

2018 ◽  
Vol 9 ◽  
pp. 1802-1808 ◽  
Author(s):  
Katherine Atamanuk ◽  
Justin Luria ◽  
Bryan D Huey
Keyword(s):  
Solar Cells ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Three Dimensional ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Photovoltaic Properties ◽  
Order Of Magnitude ◽  
Individual Grains

The nanoscale optoelectronic properties of materials can be especially important for polycrystalline photovoltaics including many sensor and solar cell designs. For thin film solar cells such as CdTe, the open-circuit voltage and short-circuit current are especially critical performance indicators, often varying between and even within individual grains. A new method for directly mapping the open-circuit voltage leverages photo-conducting AFM, along with an additional proportional-integral-derivative feedback loop configured to maintain open-circuit conditions while scanning. Alternating with short-circuit current mapping efficiently provides complementary insight into the highly microstructurally sensitive local and ensemble photovoltaic performance. Furthermore, direct open-circuit voltage mapping is compatible with tomographic AFM, which additionally leverages gradual nanoscale milling by the AFM probe essentially for serial sectioning. The two-dimensional and three-dimensional results for CdTe solar cells during in situ illumination reveal local to mesoscale contributions to PV performance based on the order of magnitude variations in photovoltaic properties with distinct grains, at grain boundaries, and for sub-granular planar defects.

scholarly journals Optical Property and Photoelectrical Performance of a Low-bandgap Conducting Polymer Incorporated with Quantum Dots Used for Organic Solar Cells

2015 ◽  
Vol 25 (2) ◽  
pp. 139
Author(s):  
Tran Thi Thao ◽  
Vu Thi Hai ◽  
Nguyen Nang Dinh ◽  
Le Dinh Trong
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Fill Factor ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Low Bandgap ◽  
A Value

By using spin-coating technique, a low bandgap conjugated polymer, poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopen-ta[2,1-b;3,4-b′]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT)  and its composite thin films have been prepared. The optical absorption and photoconductive properties with over a wide spectral range, from 350 to 950  nm, were characterized. The obtained results showed that PCPDTBT:10 wt% CdSe  composite is the most suitable for efficient light-harvesting in polymer-based photovoltaic cells. The photoelectrical conversion efficiency (PCE) of the device with  a multilayer structure of ITO/PEDOT/ PCPDTBT:CdSe /LiF/Al  reached a value as large as 1.34% with an open-circuit voltage (Voc) = 0.57 V, a short-circuit current density (Jsc) = 4.29 mA/cm2, and a fill factor (FF) = 0.27. This suggests a useful application in further fabrication of quantum dots/polymers based solar cells.

scholarly journals Fabrication and Characterization of CH3NH3PbI3 Perovskite Solar Cells Added with Polysilanes

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Takeo Oku ◽  
Junya Nomura ◽  
Atsushi Suzuki ◽  
Hiroki Tanaka ◽  
Sakiko Fukunishi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Perovskite Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Interfacial Structure ◽  
Perovskite Layer ◽  
Photovoltaic Properties ◽  
Coating Method

Effects of polysilane additions on CH3NH3PbI3 perovskite solar cells were investigated. Photovoltaic cells were fabricated by a spin-coating method using perovskite precursor solutions with polymethyl phenylsilane, polyphenylsilane, or decaphenyl cyclopentasilane (DPPS), and the microstructures were examined by X-ray diffraction and optical microscopy. Open-circuit voltages were increased by introducing these polysilanes, and short-circuit current density was increased by the DPPS addition, which resulted in the improvement of the photoconversion efficiencies to 10.46%. The incident photon-to-current conversion efficiencies were also increased in the range of 400~750 nm. Microstructure analysis indicated the formation of a dense interfacial structure by grain growth and increase of surface coverage of the perovskite layer with DPPS, and the formation of PbI2 was suppressed, leading to the improvement of photovoltaic properties.

scholarly journals The Effect of Structural Properties of Cu2Se/Polyvinylcarbazole Nanocomposites on the Performance of Hybrid Solar Cells

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
S. Govindraju ◽  
N. Ntholeng ◽  
K. Ranganathan ◽  
M. J. Moloto ◽  
L. M. Sikhwivhilu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Polymer Nanocomposites ◽  
Bulk Heterojunction ◽  
Short Circuit ◽  
Semiconductor Nanocrystals ◽  
Polymer Nanocomposite ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Colloidal Synthesis ◽  
Hybrid Solar Cells

It has been said that substitution of fullerenes with semiconductor nanocrystals in bulk heterojunction solar cells can potentially increase the power conversion efficiencies (PCE) of these devices far beyond the 10% mark. However new semiconductor nanocrystals other than the potentially toxic CdSe and PbS are necessary. Herein we report on the synthesis of Cu2Se nanocrystals and their incorporation into polyvinylcarbazole (PVK) to form polymer nanocomposites for use as active layers in hybrid solar cells. Nearly monodispersed 4 nm Cu2Se nanocrystals were synthesized using the conventional colloidal synthesis. Varying weight % of these nanocrystals was added to PVK to form polymer nanocomposites. The 10% polymer nanocomposite showed retention of the properties of the pure polymer whilst the 50% resulted in a complete breakdown of the polymeric structure as evident from the FTIR, TGA, and SEM. The lack of transport channels in the 50% polymer nanocomposite solar cell resulted in a device with no photoresponse whilst the 10% polymer nanocomposite resulted in a device with an open circuit voltage of 0.50 V, a short circuit current of 7.34 mA/cm2, and a fill factor of 22.28% resulting in a PCE of 1.02%.

Preparation and Photovoltaic Properties of Flexible Dye-Sensitized Solar Cells

2011 ◽  
Vol 306-307 ◽  
pp. 112-115 ◽  
Author(s):  
You Zeng ◽  
Li Jia Zhao ◽  
Ying Zhen ◽  
Fang Xiao Shi ◽  
Yu Tong
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Treatment Temperature ◽  
Photovoltaic Properties ◽  
Dye Sensitized ◽  
Conductive Glass ◽  
Sensitized Solar Cells

Flexible dye-sensitized solar cells (DSCs) were prepared by using carbon nanotube transparent conductive films (CNT-TCFs) as flexible substrates, and their photovoltaic properties were investigated as well. The flexible DSCs show typical photovoltaic characteristics with short-circuit current of 0.78 μA and open-circuit voltage of 1.48 mV, which was strongly influenced by heat-treatment temperature, type of dyes, and electrical resistivity. In light of their lighter weight and higher flexibility than conventional DSCs based on conductive glass substrates, the flexible DSCs have great potential as functional photoelectric components in many fields.

scholarly journals Passivation Effect of CsPbI3 Quantum Dots on the Performance and Stability of Perovskite Solar Cells

Photonics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 3
Author(s):  
Genjie Yang ◽  
Dianli Zhou ◽  
Jiawen Li ◽  
Junsheng Yu
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Active Layer ◽  
Short Circuit ◽  
Perovskite Solar Cells ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Vacancy Defects ◽  
Key Factor

The quality of active layer film is the key factor affecting the performance of perovskite solar cells. In this work, we incorporated CsPbI3 quantum dots (QDs) materials into the MAPbI3 perovskite precursor to form photoactive layer. On one hand, CsPbI3 QDs can be used as nucleation center to enhance the compactness of the perovskite film, and on the other hand, partially CsPbI3 QDs can be dissociated as anions and cations to passivate vacancy defects in the perovskite active layer. As a result, the film quality of the active layer was improved remarkably, thus exciton recombination was reduced, and carrier transfer increased accordingly. The devices based on doped-CsPbI3 QDs film had higher short circuit current, open circuit voltage and filling factor. Finally, the power conversion efficiency (PCE) was greatly enhanced from 14.85% to 17.04%. Furthermore, optimized devices also exhibited better stability. This work provides an effective strategy for the processing of high-quality perovskite films, which is of great value for the preparation and research of perovskite photoelectronic devices.

Equivalent-circuit Modeling of Microcrystalline Silicon pin Solar Cells prepared over a Wide Range of Absorber-layer Compositions

2010 ◽  
Vol 1245 ◽  
Author(s):  
Steve Reynolds ◽  
Vladimir Smirnov
Keyword(s):  
Solar Cells ◽  
Equivalent Circuit ◽  
Volume Fraction ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Crystalline Region ◽  
Photovoltaic Properties ◽  
Wide Range ◽  
Low Crystalline

AbstractAn equivalent-circuit electrical model is used to simulate the photovoltaic properties of mixed-phase thin-film silicon solar cells. Microcrystalline and amorphous phases are represented as separate parallel-connected photodiode equivalent circuits, scaled by assuming that the photodiode area is directly proportional to the volume fraction of each phase. A reasonable correspondence between experiment and simulation is obtained for short-circuit current and open-circuit voltage vs. volume fraction. However the large dip in fill-factor and reduced PV efficiency measured for cells prepared in the low-crystalline region is inadequately reproduced. It is concluded that poor PV performance in this region is not due solely to shunting by more highly-crystalline filaments, which supports the view that the low-crystalline material has transport properties inferior to either microcrystalline or amorphous silicon.

scholarly journals The performance of solar cells using chlorophyll dye from Syzygium paniculatum

Clean Energy ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 433-440
Author(s):  
Sri Wuryanti
Keyword(s):  
Solar Cells ◽  
Short Circuit ◽  
Dye Sensitized Solar Cells ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Open Circuit ◽  
Photovoltaic Properties ◽  
Irregular Shapes ◽  
Sensitized Solar Cells

Abstract In this study, analysis was performed of the macro characterization of solar cells with chlorophyll dye from Syzygium paniculatum, using scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis. Solar cells based on titanium dioxide (TiO2) nanomaterial and chlorophyll dye from S. paniculatum can increase efficiency due to flavonoids and batulinic acid content. Photoanode TiO2 is one of the essential factors determining the photovoltaic properties of dye-sensitized solar cells (DSSCs) and shade, which broadens the absorption spectrum. Furthermore, the method used in this research involved varying the colour of the S. paniculatum leaves, namely red (SP-Red), green (SP-Green) and a red–green mix (SP-Mix). From a macro analysis, SEM observations resulted in agglomerated and aggregated TiO2-polyethylene glycol (PEG)-dye layers with irregular shapes. EDX observation resulted in a peak in Ti at 5 keV and all constituents were detected with an O:Ti ratio of 3.47:1 for FTO-TiO2/PEG using SP-Green. Measurement of voltage-current (IV) using a digital multimeter indicated that the best occurred in the DSSC with SP-Green, resulting in a short-circuit current density (Isc) of 0.0047 mA/cm2, an open-circuit voltage (Voc) of 0.432 V, a charging factor (FF) of 0.749 and an efficiency (η) of 3.724%.

Solid state PbS Quantum dots /TiO2 Nanoparticles heterojunction solar cell

2012 ◽  
Vol 1390 ◽  
Author(s):  
Lioz Etgar ◽  
Michael Grätzel
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solid State ◽  
Short Circuit ◽  
Open Circuit ◽  
Layer By Layer ◽  
Heterojunction Solar Cells ◽  
Layer Deposition ◽  
Pbs Quantum Dots ◽  
Open Circuit Photovoltage

ABSTRACTSolid state PbS Quantum Dots (QDs)/TiO2 Nanoparticles heterojunction solar cells were produced by depositing PbS QDs on a 500nm thick Mesoscopic TiO2 films using layer-by-layer deposition. The heterojunction solar cells show photovoltaic response from the visible to the near infra-red region. Importantly, the PbS QDs act here as photosensitizers and at the same time as hole conductors. The PbS QDs/TiO2 device produces a remarkable short circuit photocurrent (Jsc) of 16.3 mA/cm2, an open circuit photovoltage (Voc) of 0.54 V and a fill factor (FF) of 0.41, corresponding to a light to electric power conversion efficiency (η) of 4.04% under 0.9 sun intensity.

scholarly journals Efficient Solar Cells Based on a Polymer Donor with β-Branching in Trialkylsilyl Side Chains

2021 ◽  
Vol 03 (02) ◽  
pp. 134-140
Author(s):  
Haijun Bin ◽  
Martijn M. Wienk ◽  
René A. J. Janssen
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Short Circuit ◽  
Energy Levels ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Side Chains ◽  
Photovoltaic Properties ◽  
Alkyl Groups ◽  
High Efficient

Side-chain engineering is an important strategy in designing novel polymer semiconductor materials for high-efficient organic solar cells. The use of trialkylsilyl side chains can improve the photovoltaic efficiency by decreasing the energy of the HOMO of the polymer and improving its crystallinity and hole mobility. Compared to simple linear derivatives, α-branching in the alkyl groups of trialkylsilyl side chains causes strong aggregation and excessive phase separation in the photoactive layer, leading to poor device performance. β-Branching of the alkyl groups has not yet been used in trialkylsilyl side chains. Herein, we describe a new polymer (J77) with triisobutylsilyl side chains to investigate the effect of β-branching on the molecular aggregation, optical properties, energy levels, and photovoltaic properties. We find that compared to α-branching, β-branching of alkyl groups in trialkylsilyl side chains significantly reduces aggregation. This enables J77 to form blend morphologies in films that provide high-efficient solar cells in combination with different non-fullerene acceptors. Moreover β-branching of the alkyl groups in trialkylsilyl side chains lowers the HOMO energy level of J77 and increases the open-circuit voltage of J77-based solar cells without sacrificing short-circuit current density or fill factor.

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