scholarly journals Down-Conversion Polymer Composite Coatings with Multipeak Absorption and Emission

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 282
Author(s):  
Jun Fang ◽  
Wenting Liu ◽  
Wenying Zhou ◽  
Cheng Zhu ◽  
Yaru Ni ◽  
...  
Keyword(s):  
Solar Cells ◽  
Uv Light ◽  
Spectral Response ◽  
Composite Coatings ◽  
Red Light ◽  
Polymer Coatings ◽  
Absorption And Emission ◽  
Response Range ◽  
Luminescent Coatings ◽  
Down Conversion

Spectral adjustment is an effective method to increase light conversion efficiency of solar cells and to promote the growth of plants. Down-converter (DC) materials are considered to be one of the most effective methods of spectral modification. The focus of this work was to expand the spectral response range of down-conversion layers to achieve multipeak absorption and emission. Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu, which have different excitation peaks in the UV-blue region and varied emission peaks in visible light regions, were prepared in this work. Sr2CaMoO6:Sm,Na can effectively produce red light at 648 nm upon excitation at 408 nm, while YVO4:Bi,Eu can produce red light at 618 nm upon excitation at 365 nm. Polymeric luminescent coatings with one single kind of phosphor were prepared separately before the two phosphors were mixed together in uniform polymer coatings. The two phosphors were also assembled in bilayer coatings with different concentrations. The results showed that high transmittances over 90% were achieved for the two composite coatings with the thickness of 20 and 30 μm. The increase in particle loadings from 1‰ to 4‰ slightly decreased coating transmittance but increased luminescence intensity. The increase in the ratio of Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu from 5/1 to 10/1 resulted in high transmittance of the DC coatings, independent of total filler loadings (3‰ and 4‰) and coating thickness. The relative intensities of emission peaks can be adjusted conveniently by changing filler ratios. In addition, the transmittance and luminescent intensities of the coatings where the two phosphors were assembled in two layers were close to the uniform coatings, suggesting the negligible effect of UV light irradiation order. This work proved that the prepared coatings presented multipeak absorption and emission upon UV light excitation. These coatings can be expected to be applied in fields such as solar cells and agriculture greenhouses.

scholarly journals Hybrid ZnO Electron Transport Layer by Down Conversion Complexes for Dual Improvements of Photovoltaic and Stable Performances in Polymer Solar Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 80 ◽  
Author(s):  
Fanchen Bu ◽  
Wenfei Shen ◽  
Xiaolin Zhang ◽  
Yao Wang ◽  
Laurence A. Belfiore ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Uv Light ◽  
Polymer Solar Cells ◽  
Spectral Response ◽  
Photovoltaic Performance ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Light Stability ◽  
Down Conversion

Polymer solar cells (PSCs) have shown excellent photovoltaic performance, however, extending the spectral response range to the ultraviolet (UV) region and enhancing the UV light stability remain two challenges to overcome in the development of PSCs. Lanthanide down-conversion materials can absorb the UV light and re-emit it at the visible region that matches well with the absorption of the active layer material PTB7-Th (poly[[2,6′-4,8-di(5-ethylhexylthienyl)benzo[1,2-b;3,3-b]dithiophene][3-fluoro-2[(2-ethylhexyl)carbony]thieno[3,4-b]thiophenediyl]]) and PBDB-T-2F, thus helping to enhance the photovoltaic performance and UV light stability of PSCs. In this research, a down-conversion material Eu(TTA)3phen (ETP) is introduced into the cathode transport layer (ZnO) in PSCs to manipulate its nanostructure morphology for its application in hyperfine structure of PSCs. The device based on the ZnO/ETP electron transport layer can obtain power conversion efficiencies (PCEs) of 9.22% (PTB7-Th–PC71BM ([6,6]-phenylC71-butyric acid methyl ester) device) and 13.12% (PBDB-T-2F–IT-4F device), respectively. Besides, in the research on PTB7-Th-PC71BM device, the stability of the device based on ZnO/ETP layer is prolonged by 70% compared with the ZnO device. The results suggest that the ZnO/ETP layer plays the role of enhanced photovoltaic performance and prolonged device stability, as well as reducing photo-loss and UV degradation for PSCs.

Simultaneous enhancement in performance and UV-light stability of organic–inorganic perovskite solar cells using a samarium-based down conversion material

2019 ◽  
Vol 7 (1) ◽  
pp. 322-329 ◽  
Author(s):  
Naveed Ur Rahman ◽  
Wasim Ullah Khan ◽  
Wenlang Li ◽  
Shaukat Khan ◽  
Javid Khan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Uv Light ◽  
Perovskite Solar Cells ◽  
Device Performance ◽  
Inorganic Perovskite ◽  
Term Stability ◽  
Long Term Stability ◽  
Light Stability ◽  
Down Conversion

A samarium-based down conversion material was employed to simultaneously improve the device performance and long-term stability of perovskite solar cells.

Preparation and photocatalytic activity of pendant heteroaryl groups (pyrimidine and pyridine) grafted polyterthiophene/TiO2 composites

2020 ◽  
Vol 10 (11) ◽  
pp. 1877-1891
Author(s):  
Yingcheng Liu ◽  
Abdukeyum Abdurexit ◽  
Ruxangul Jamal ◽  
Wenli Zhang ◽  
Yinqiang Yan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Structural Analysis ◽  
Uv Light ◽  
Spectral Response ◽  
Solar Irradiation ◽  
Molar Ratio ◽  
Response Range ◽  
Non Covalent Interactions ◽  
Simulated Solar Irradiation ◽  
Covalent Interactions

In this paper, new π-conjugated heterocyclic systems with pyrimidine- and pyridine-grafted polyterthiophene were combined with TiO2 to obtain composite materials (PDTPrT/TiO2 and PDTPrmT/TiO2). The photocatalytic properties of the composites were tested by using them to degrade MB using UV-light and simulated solar irradiation. The structural analysis revealed that the pyrimidine and pyridine groups in the polyterthiophenes interacted with TiO2 via non-covalent interactions. The combination of the substituted polyterthiophene and TiO2 restrained the recombination rate of photogenerated e-?h+ pairs and broadened the spectral response range of TiO2. The results indicated that PDTPrT/TiO2 and PDTPrmT/TiO2 with a TiO2-to-monomer molar ratio of 75 had the highest photodegradation rates under UV light (98.6% and 97.4%, respectively after 10 min) and simulated solar (95.4% and 92.7%, respectively after 300 min).

A promising europium-based down conversion material: organic–inorganic perovskite solar cells with high photovoltaic performance and UV-light stability

2019 ◽  
Vol 7 (11) ◽  
pp. 6467-6474 ◽  
Author(s):  
Naveed Ur Rahman ◽  
Wasim Ullah Khan ◽  
Shaukat Khan ◽  
Xiaojie Chen ◽  
Javid Khan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Uv Light ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Device Stability ◽  
Light Stability ◽  
Down Conversion

A europium-based down conversion material enables perovskite solar cells with simultaneous improvement in photovoltaic performance and device stability.

Conversion of phycocyanobilin-binding GAF domain to biliverdin-binding domain

2018 ◽  
Vol 22 (05) ◽  
pp. 398-405 ◽  
Author(s):  
Ping-Ping Hu ◽  
Jian-Yun Hou ◽  
Rui Guo ◽  
Su-Ping Jiang ◽  
Ming Zhou ◽  
...  
Keyword(s):  
Near Infrared ◽  
Spectral Response ◽  
Red Light ◽  
Random Mutagenesis ◽  
Ultra Violet ◽  
Site Directed Mutagenesis ◽  
Absorbing State ◽  
Response Range ◽  
Infrared Spectral ◽  
Primary Amino

Cyanobacteriochromes (CBCRs) are biliprotein photoreceptors that only exist in cyanobacteria and have a broad spectral response range from ultra-violet to far-red. The red/green-type CBCRs can show red/green reversible photoconversion via a covalently bound phycocyanobilin (PCB). In recent years, several CBCRs binding with not only PCB but also biliverdin (BV) have been discovered, which raises the possibility of CBCRs being applied as optogenetic tools. Through molecular modification, we hope to engineer BV-binding CBCRs responsive to the near-infrared spectral region (650–900 nm), of which the red/green type of CBCRs are suitable resources for experimentation. Here, we use Slr1393g3 (the third GAF domain of a red/green photoswitching CBCR from Synechocystis sp. PCC 6803) as a template to perform such molecular evolution using both random mutagenesis and site-directed mutagenesis. After several rounds of random mutagenesis, we obtained several BV-binding variants of Slr1393g3. These BV-binding variants have a maximal absorbance at ̃690 nm and a fluorescence at ̃720 nm. Additionally, some of them have remarkable photochromicity between a far-red light-absorbing state and a red light-absorbing state. Based on the primary amino acid sequence and structural models, the Phe474 surrounding ring D of BV is thought as a crucial site for chromophore selectivity.

Highly sensitive polymer photodetectors with a broad spectral response range from UV light to the near infrared region

2015 ◽  
Vol 3 (28) ◽  
pp. 7386-7393 ◽  
Author(s):  
Wenbin Wang ◽  
Fujun Zhang ◽  
Lingliang Li ◽  
Miao Zhang ◽  
Qiaoshi An ◽  
...  
Keyword(s):  
Active Layer ◽  
Near Infrared ◽  
Uv Light ◽  
Spectral Response ◽  
Infrared Region ◽  
Response Range ◽  
Highly Sensitive ◽  
Near Infrared Region

Highly sensitive polymer photodetectors with a broad spectral response range from UV light to the near infrared region based on P3HT : PTB7-Th : PC71BM as the active layer are reported.

scholarly journals PERFORMANCE of HYDROGENATED a-Si:H SOLAR CELLS with DOWNSHIFTING COATING

2011 ◽  
Vol 1321 ◽  
Author(s):  
Bill Nemeth ◽  
Yueqin Xu ◽  
Haorong Wang ◽  
Ted Sun ◽  
Benjamin G. Lee ◽  
...  
Keyword(s):  
Solar Cell ◽  
Open Circuit Voltage ◽  
Uv Light ◽  
Spectral Response ◽  
Red Light ◽  
Open Circuit ◽  
Narrow Line ◽  
Solar Cell Performance ◽  
Amorphous Si ◽  
Hydrogenated Amorphous

ABSTRACTWe apply a thin luminescent downshifting (LDS) coating to a hydrogenated amorphous Si (a-Si:H) solar cell and study the mechanism of possible current enhancement. The conversion material used in this study converts wavelengths below 400 nm to a narrow line around 615 nm. This material is coated on the front of the glass of the a-Si:H solar cell with a glass/TCO/p/i/n/Ag superstrate configuration. The initial efficiency of the solar cell without the LDS coating is above 9.0 % with open circuit voltage of 0.84 V. Typically, the spectral response below 400 nm of an a-Si:H solar cell is weaker than that at 615 nm. By converting ultraviolet (UV) light to red light, the solar cell will receive more red photons; therefore, solar cell performance is expected to improve. We observe evidence of downshifting in reflectance spectra. The cell Jsc decreases by 0.13 mA/cm2, and loss mechanisms are identified.

Spectral Response of a-Si:H p-i-n Solar Cells Degraded by Blue and Red Light

1995 ◽  
Vol 377 ◽  
Author(s):  
A. Mittiga ◽  
L. Mariuc ◽  
T. Fasolino ◽  
A. Romano ◽  
P. Fiorini ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Spatial Distribution ◽  
Solar Cells ◽  
Blue Light ◽  
Spectral Response ◽  
Red Light ◽  
Experimental Results ◽  
Simulation Program ◽  
Total Density ◽  
Response Curves

ABSTRACTWe have degraded a-Si:H p-i-n solar cells at Voc using both red and blue light to investigate the effect of a possible different spatial distribution of defects in the intrinsic layer. We have found that the I-V and the spectral response curves of the degraded cells depend on the total density of defects only and are not sensitive to the wavelength of the degradation light. These experimental results and some peculiar features of the spectral response of the degraded cells are explained with the aid of a numerical simulation program.

scholarly journals Ultraviolet-Filtering Luminescent Transparent Coatings for High-Performance PTB7-Th:ITIC–Based Organic Solar Cells

2021 ◽  
Vol 3 ◽  
Author(s):  
Joana Farinhas ◽  
Sandra F. H. Correia ◽  
Lianshe Fu ◽  
Alexandre M. P. Botas ◽  
Paulo S. André ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Bulk Heterojunction ◽  
Spectral Response ◽  
Visible Spectral Range ◽  
Device Performance ◽  
Transparent Coatings ◽  
Luminescent Coatings ◽  
Organic Heterojunctions

Photovoltaic (PV) devices based on organic heterojunctions have recently achieved remarkable power conversion efficiency (PCE) values. However, photodegradation is often a cause of dramatic drops in device performance. The use of ultraviolet (UV)-absorbing luminescent downshifting (LDS) layers can be a mitigation strategy to simultaneously filter UV radiation reaching the device and reemit it with lower energy in the visible spectral range, matching the maximum spectral response of the PV cells and thus enabling the increase of the photocurrent generated by the cell. In this work, we report the use of a Eu3+-doped siliceous-based organic–inorganic hybrid as a coating on organic solar cells based on the PTB7-Th:ITIC bulk heterojunction with the purpose of increasing their performance. We found that the applied coatings yield a PCE enhancement of ∼22% (from 3.1 to 3.8%) in solar cells with spin-coated layers, compared with the bare solar cells, which is among the highest performance enhancements induced by plastic luminescent coatings.

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