The Experts below are selected from a list of 144 Experts worldwide ranked by ideXlab platform
Frederik C Krebs - One of the best experts on this subject based on the ideXlab platform.
-
Roll Coating fabrication of flexible organic solar cells comparison of fullerene and fullerene free systems
Journal of Materials Chemistry, 2016Co-Authors: Kua Liu, Thue Trofod Larsenolse, Michail J Eliatis, Eva Undgaard, Mikkel Jorgense, Frederik C Krebs, Xiaowei ZhaAbstract:Flexible organic solar cells (OSCs) based on a blend of low-bandgap polymer donor PTB7-TH and non-fullerene small molecule acceptor IEIC were fabricated via a Roll-Coating process under ambient atmosphere. Both an indium tin oxide (ITO)-free substrate and a flexible ITO substrate were employed in these inverted OSCs. OSCs with flexible ITO and ITO-free substrates exhibited power conversion efficiencies (PCEs) up to 2.26% and 1.79%, respectively, which were comparable to those of the reference devices based on fullerene acceptors under the same conditions. This is the first example for all Roll-Coating fabrication procedures for flexible OSCs based on non-fullerene acceptors with the PCE exceeding 2%. The fullerene-free OSCs exhibited better dark storage stability than the fullerene-based control devices.
-
Roll Coating fabrication of ito free flexible solar cells based on a non fullerene small molecule acceptor
RSC Advances, 2015Co-Authors: Wenqing Liu, Eva Undgaard, Frederik C Krebs, Xiaowei Zha, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Hangqi Shi, Minmi Shi, Hongzheng CheAbstract:We report organic solar cells (OSCs) with non-fullerene small molecule acceptors (SMAs) prepared in large area via a Roll Coating process. We employ all solution-processed indium tin oxide (ITO)-free flexible substrates for inverted solar cells with a new SMA of F(DPP)2B2. By utilizing poly(3-hexylthiophene) as donor blended with F(DPP)2B2 as acceptor, ITO-free large-area flexible SMA based OSCs were produced under ambient conditions with the use of slot-die Coating and flexographic printing methods on a lab-scale compact Roll-coater that is readily transferrable to Roll-to-Roll processing. The effect of different processing solvents on the device performance was investigated, and the best performance with a power conversion efficiency of 0.65%, an open circuit voltage of 0.85 V, a short-circuit current density of 2.19 mA cm−2, and a fill factor of 35% was obtained.
-
Roll Coating fabrication of flexible large area small molecule solar cells with power conversion efficiency exceeding 1
Journal of Materials Chemistry, 2014Co-Authors: Wenqing Liu, Eva Undgaard, Mikkel Jorgense, Xiaowei Zha, Shiyong Liu, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Meirong Che, Frederik C KrebsAbstract:All solution-processed flexible large area small molecule bulk heterojunction solar cells were fabricated via Roll-Coating technology. Our devices were produced from slot-die Coating on a lab-scale mini Roll-coater under ambient conditions without the use of spin-Coating or vacuum evaporation methods. Four diketopyrrolopyrrole based small molecules (SMs 1–4) were utilized as electron donors with (6,6)-phenyl-C61-butyric acid methyl ester as an acceptor and their photovoltaic performances based on Roll-coated devices were investigated. The best power conversion efficiency (PCE) of 1.01%, combined with an open circuit voltage of 0.73 V, a short-circuit current density of 3.13 mA cm−2 and a fill factor of 44% were obtained for the device with SM1, which was the first example reported for efficient Roll-Coating fabrication of flexible large area small molecule solar cells with PCE exceeding 1%. In addition, Roll-coated devices based on SMs 2–4 also showed good performances with PCEs of 0.41%, 0.54%, and 0.31%, respectively. Our results prove that small molecules have the potential for use in industries for large scale production of efficient organic solar cells.
-
in situ monitoring of structure formation in the active layer of polymer solar cells during Roll to Roll Coating
AIP Advances, 2014Co-Authors: Lea Hildebrand Rossande, Frederik C Krebs, Natalia Klaudia Zawacka, Henrik Friis Dam, Jens Wenzel AndreaseAbstract:The active layer crystallization during Roll-to-Roll Coating of organic solar cells is studied in situ. We developed an X-ray setup where the coater unit is an integrated part of the small angle X-ray scattering instrument, making it possible to control the Coating process while recording scattering measurements in situ, enabling us to follow the crystal formation during drying. By varying the distance between the Coating head and the point where the X-ray beam hits the film, we obtained measurements of 4 different stages of drying. For each of those stages, the scattering from as long a foil as possible is summed together, with the distance from Coating head to scattering point kept constant. The results are average crystallographic properties for the active layer coated on a 30 m long foil. With this insight into the dynamics of crystallization in a Roll-coated polymer film, we find that the formation of textured and untextured crystallites seems uncorrelated, and happens at widely different rates. Untextured P3HT crystallites form later in the drying process than expected which may explain previous studies speculating that untextured crystallization depends on concentration. Textured crystallites, however, begin forming much earlier and steadily increases as the film dries, showing a development similar to other in situ studies of these materials.
-
ambient fabrication of flexible and large area organic light emitting devices using slot die Coating
Nature Communications, 2012Co-Authors: Andreas Sandstrom, Frederik C Krebs, Ludvig EdmanAbstract:The grand vision of manufacturing large-area emissive devices with low-cost Roll-to-Roll Coating methods, akin to how newspapers are produced, appeared with the emergence of the organic light-emitt ...
Xiaowei Zha - One of the best experts on this subject based on the ideXlab platform.
-
Roll Coating fabrication of flexible organic solar cells comparison of fullerene and fullerene free systems
Journal of Materials Chemistry, 2016Co-Authors: Kua Liu, Thue Trofod Larsenolse, Michail J Eliatis, Eva Undgaard, Mikkel Jorgense, Frederik C Krebs, Xiaowei ZhaAbstract:Flexible organic solar cells (OSCs) based on a blend of low-bandgap polymer donor PTB7-TH and non-fullerene small molecule acceptor IEIC were fabricated via a Roll-Coating process under ambient atmosphere. Both an indium tin oxide (ITO)-free substrate and a flexible ITO substrate were employed in these inverted OSCs. OSCs with flexible ITO and ITO-free substrates exhibited power conversion efficiencies (PCEs) up to 2.26% and 1.79%, respectively, which were comparable to those of the reference devices based on fullerene acceptors under the same conditions. This is the first example for all Roll-Coating fabrication procedures for flexible OSCs based on non-fullerene acceptors with the PCE exceeding 2%. The fullerene-free OSCs exhibited better dark storage stability than the fullerene-based control devices.
-
Roll Coating fabrication of ito free flexible solar cells based on a non fullerene small molecule acceptor
RSC Advances, 2015Co-Authors: Wenqing Liu, Eva Undgaard, Frederik C Krebs, Xiaowei Zha, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Hangqi Shi, Minmi Shi, Hongzheng CheAbstract:We report organic solar cells (OSCs) with non-fullerene small molecule acceptors (SMAs) prepared in large area via a Roll Coating process. We employ all solution-processed indium tin oxide (ITO)-free flexible substrates for inverted solar cells with a new SMA of F(DPP)2B2. By utilizing poly(3-hexylthiophene) as donor blended with F(DPP)2B2 as acceptor, ITO-free large-area flexible SMA based OSCs were produced under ambient conditions with the use of slot-die Coating and flexographic printing methods on a lab-scale compact Roll-coater that is readily transferrable to Roll-to-Roll processing. The effect of different processing solvents on the device performance was investigated, and the best performance with a power conversion efficiency of 0.65%, an open circuit voltage of 0.85 V, a short-circuit current density of 2.19 mA cm−2, and a fill factor of 35% was obtained.
-
Roll Coating fabrication of flexible large area small molecule solar cells with power conversion efficiency exceeding 1
Journal of Materials Chemistry, 2014Co-Authors: Wenqing Liu, Eva Undgaard, Mikkel Jorgense, Xiaowei Zha, Shiyong Liu, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Meirong Che, Frederik C KrebsAbstract:All solution-processed flexible large area small molecule bulk heterojunction solar cells were fabricated via Roll-Coating technology. Our devices were produced from slot-die Coating on a lab-scale mini Roll-coater under ambient conditions without the use of spin-Coating or vacuum evaporation methods. Four diketopyrrolopyrrole based small molecules (SMs 1–4) were utilized as electron donors with (6,6)-phenyl-C61-butyric acid methyl ester as an acceptor and their photovoltaic performances based on Roll-coated devices were investigated. The best power conversion efficiency (PCE) of 1.01%, combined with an open circuit voltage of 0.73 V, a short-circuit current density of 3.13 mA cm−2 and a fill factor of 44% were obtained for the device with SM1, which was the first example reported for efficient Roll-Coating fabrication of flexible large area small molecule solar cells with PCE exceeding 1%. In addition, Roll-coated devices based on SMs 2–4 also showed good performances with PCEs of 0.41%, 0.54%, and 0.31%, respectively. Our results prove that small molecules have the potential for use in industries for large scale production of efficient organic solar cells.
Wenqing Liu - One of the best experts on this subject based on the ideXlab platform.
-
Roll Coating fabrication of ito free flexible solar cells based on a non fullerene small molecule acceptor
RSC Advances, 2015Co-Authors: Wenqing Liu, Eva Undgaard, Frederik C Krebs, Xiaowei Zha, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Hangqi Shi, Minmi Shi, Hongzheng CheAbstract:We report organic solar cells (OSCs) with non-fullerene small molecule acceptors (SMAs) prepared in large area via a Roll Coating process. We employ all solution-processed indium tin oxide (ITO)-free flexible substrates for inverted solar cells with a new SMA of F(DPP)2B2. By utilizing poly(3-hexylthiophene) as donor blended with F(DPP)2B2 as acceptor, ITO-free large-area flexible SMA based OSCs were produced under ambient conditions with the use of slot-die Coating and flexographic printing methods on a lab-scale compact Roll-coater that is readily transferrable to Roll-to-Roll processing. The effect of different processing solvents on the device performance was investigated, and the best performance with a power conversion efficiency of 0.65%, an open circuit voltage of 0.85 V, a short-circuit current density of 2.19 mA cm−2, and a fill factor of 35% was obtained.
-
Roll Coating fabrication of flexible large area small molecule solar cells with power conversion efficiency exceeding 1
Journal of Materials Chemistry, 2014Co-Authors: Wenqing Liu, Eva Undgaard, Mikkel Jorgense, Xiaowei Zha, Shiyong Liu, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Meirong Che, Frederik C KrebsAbstract:All solution-processed flexible large area small molecule bulk heterojunction solar cells were fabricated via Roll-Coating technology. Our devices were produced from slot-die Coating on a lab-scale mini Roll-coater under ambient conditions without the use of spin-Coating or vacuum evaporation methods. Four diketopyrrolopyrrole based small molecules (SMs 1–4) were utilized as electron donors with (6,6)-phenyl-C61-butyric acid methyl ester as an acceptor and their photovoltaic performances based on Roll-coated devices were investigated. The best power conversion efficiency (PCE) of 1.01%, combined with an open circuit voltage of 0.73 V, a short-circuit current density of 3.13 mA cm−2 and a fill factor of 44% were obtained for the device with SM1, which was the first example reported for efficient Roll-Coating fabrication of flexible large area small molecule solar cells with PCE exceeding 1%. In addition, Roll-coated devices based on SMs 2–4 also showed good performances with PCEs of 0.41%, 0.54%, and 0.31%, respectively. Our results prove that small molecules have the potential for use in industries for large scale production of efficient organic solar cells.
Eva Undgaard - One of the best experts on this subject based on the ideXlab platform.
-
Roll Coating fabrication of flexible organic solar cells comparison of fullerene and fullerene free systems
Journal of Materials Chemistry, 2016Co-Authors: Kua Liu, Thue Trofod Larsenolse, Michail J Eliatis, Eva Undgaard, Mikkel Jorgense, Frederik C Krebs, Xiaowei ZhaAbstract:Flexible organic solar cells (OSCs) based on a blend of low-bandgap polymer donor PTB7-TH and non-fullerene small molecule acceptor IEIC were fabricated via a Roll-Coating process under ambient atmosphere. Both an indium tin oxide (ITO)-free substrate and a flexible ITO substrate were employed in these inverted OSCs. OSCs with flexible ITO and ITO-free substrates exhibited power conversion efficiencies (PCEs) up to 2.26% and 1.79%, respectively, which were comparable to those of the reference devices based on fullerene acceptors under the same conditions. This is the first example for all Roll-Coating fabrication procedures for flexible OSCs based on non-fullerene acceptors with the PCE exceeding 2%. The fullerene-free OSCs exhibited better dark storage stability than the fullerene-based control devices.
-
Roll Coating fabrication of ito free flexible solar cells based on a non fullerene small molecule acceptor
RSC Advances, 2015Co-Authors: Wenqing Liu, Eva Undgaard, Frederik C Krebs, Xiaowei Zha, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Hangqi Shi, Minmi Shi, Hongzheng CheAbstract:We report organic solar cells (OSCs) with non-fullerene small molecule acceptors (SMAs) prepared in large area via a Roll Coating process. We employ all solution-processed indium tin oxide (ITO)-free flexible substrates for inverted solar cells with a new SMA of F(DPP)2B2. By utilizing poly(3-hexylthiophene) as donor blended with F(DPP)2B2 as acceptor, ITO-free large-area flexible SMA based OSCs were produced under ambient conditions with the use of slot-die Coating and flexographic printing methods on a lab-scale compact Roll-coater that is readily transferrable to Roll-to-Roll processing. The effect of different processing solvents on the device performance was investigated, and the best performance with a power conversion efficiency of 0.65%, an open circuit voltage of 0.85 V, a short-circuit current density of 2.19 mA cm−2, and a fill factor of 35% was obtained.
-
Roll Coating fabrication of flexible large area small molecule solar cells with power conversion efficiency exceeding 1
Journal of Materials Chemistry, 2014Co-Authors: Wenqing Liu, Eva Undgaard, Mikkel Jorgense, Xiaowei Zha, Shiyong Liu, Natalia Klaudia Zawacka, Thomas Rieks Anderse, Pei Cheng, Meirong Che, Frederik C KrebsAbstract:All solution-processed flexible large area small molecule bulk heterojunction solar cells were fabricated via Roll-Coating technology. Our devices were produced from slot-die Coating on a lab-scale mini Roll-coater under ambient conditions without the use of spin-Coating or vacuum evaporation methods. Four diketopyrrolopyrrole based small molecules (SMs 1–4) were utilized as electron donors with (6,6)-phenyl-C61-butyric acid methyl ester as an acceptor and their photovoltaic performances based on Roll-coated devices were investigated. The best power conversion efficiency (PCE) of 1.01%, combined with an open circuit voltage of 0.73 V, a short-circuit current density of 3.13 mA cm−2 and a fill factor of 44% were obtained for the device with SM1, which was the first example reported for efficient Roll-Coating fabrication of flexible large area small molecule solar cells with PCE exceeding 1%. In addition, Roll-coated devices based on SMs 2–4 also showed good performances with PCEs of 0.41%, 0.54%, and 0.31%, respectively. Our results prove that small molecules have the potential for use in industries for large scale production of efficient organic solar cells.
Chaosung Lin - One of the best experts on this subject based on the ideXlab platform.
-
oxidation resistant silane Coating for hot dip galvanized hot stamping steel
Corrosion Science, 2020Co-Authors: Junkai Chang, Chaosung Lin, Weijen Cheng, Ihsuang Lo, Woeiren WangAbstract:Abstract A silane Coating was developed for hot-dip galvanized (HDG) steel via a sol-gel Roll Coating method and its oxidation resistance during austenitization was detailed. The HDG steel with silane Coating retains metallic appearance after 900 °C austenitization for 5 min. Moreover, the silane Coating preserves more Zn in the alloy layer, conferring better corrosion resistance. Liquid metal embrittlement is absent when a thinner Zn Coating (∼ 7 μm) is applied, yet imparts cathodic protection to the austenitized silane-coated HDG steel with a cosmetic Coating. The silane Coating markedly inhibits oxidation and confers enhanced corrosion resistance for hot-stamped HDG steel parts.
-
a Roll Coating tungstate passivation treatment for hot dip galvanized sheet steel
Surface & Coatings Technology, 2011Co-Authors: Chengyang Tsai, Jenshou Liu, Peili Chen, Chaosung LinAbstract:A tungstate passivation treatment was performed on hot-dip galvanized steel via a Roll Coating process. The effect of anion (phosphate and nitrate) in the tungstate solution on the microstructure and corrosion resistance of the passive film was explored. The surface morphology of the GI steel slightly changed after Roll Coating using tungstate/phosphoric and tungstate/nitric solutions. Cross-sectional transmission electron microscope characterization revealed that the passive film prepared by the tungstate/phosphoric solution consisted of a thin compact layer, whereas that prepared by the tungstate/nitric solution was relatively thick and porous. The reduction of tungstate anion to low-valent tungsten oxide and metallic tungsten was also observed. Compared with nitrate anion, the presence of phosphate anion in the solution resulted in zinc phosphate, less metallic tungsten, and more hexavalent tungsten species in the passive film. As a result, the passive film prepared by the tungstate/phosphoric solution displayed a better corrosion resistance than that prepared by the tungstate/nitric solution, as evaluated by polarization measurement and salt spray test.
-
a two step Roll Coating phosphate molybdate passivation treatment for hot dip galvanized steel sheet
Corrosion Science, 2010Co-Authors: Chengyang Tsai, Jenshou Liu, Peili Chen, Chaosung LinAbstract:A two-step Roll Coating passivation treatment employing phosphate followed by molybdate solutions has been performed on hot-dip galvanized (GI) steel sheet. The phosphate Coating was primarily porous, amorphous Zn phosphate. A second step Coating treatment resulted in more hemispherical Zn phosphate particles and the incorporation of molybdate ions and molybdenum oxide into the existing phosphate Coating, giving rise to an improved corrosion resistance. The Coating reaction during the second step Roll Coating treatment and the corrosion protection afforded by the second step molybdate treatment are discussed, with emphases on the comparison with the Coating formed via immersion.
