The Experts below are selected from a list of 182298 Experts worldwide ranked by ideXlab platform
Jingbi You - One of the best experts on this subject based on the ideXlab platform.
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10 2 Power Conversion efficiency polymer tandem solar cells consisting of two identical sub cells
Advanced Materials, 2013Co-Authors: Jingbi You, Chun-chao Chen, Ken Yoshimura, Jing Gao, Kenichiro Ohya, Ziruo Hong, Yang YangAbstract:Polymer tandem solar cells with 10.2% Power Conversion efficiency are demonstrated via stacking two PDTP-DFBT:PC₇₁ BM bulk heterojunctions, connected by MoO₃/PEDOT:PSS/ZnO as an interconnecting layer. The tandem solar cells increase the Power Conversion efficiency of the PDTP-DFBT:PC₇₁ BM system from 8.1% to 10.2%, successfully demonstrating polymer tandem solar cells with identical sub-cells of double-digit efficiency.
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a polymer tandem solar cell with 10 6 Power Conversion efficiency
Nature Communications, 2013Co-Authors: Jingbi You, Letian Dou, Chun-chao Chen, Tom Moriarty, Ken Yoshimura, Keith Emery, Jing Gao, T. Kato, Kenichiro Ohya, Gang LiAbstract:Tandem solar cell structures combine high- and low-bandgap materials, allowing a broader spectral absorption of solar radiation. The authors report the synthesis of a high performance low-bandgap polymer which enables fabrication of a tandem solar cell with a certified Power Conversion efficiency of 10.6%.
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A polymer tandem solar cell with 10.6% Power Conversion efficiency
Nature Communications, 2013Co-Authors: Jingbi You, Letian Dou, Ken Ohya, Chun-chao Chen, Tom Moriarty, Ken Yoshimura, Keith Emery, Jing Gao, T. Kato, Gang LiAbstract:An effective way to improve polymer solar cell efficiency is to use a tandem structure, as a broader part of the spectrum of solar radiation is used and the thermalization loss of photon energy is minimized. In the past, the lack of high-performance low-bandgap polymers was the major limiting factor for achieving high-performance tandem solar cell. Here we report the development of a high-performance low bandgap polymer (bandgap 60% and spectral response that extends to 900 nm, with a Power Conversion efficiency of 7.9%. The polymer enables a solution processed tandem solar cell with certified 10.6% Power Conversion efficiency under standard reporting conditions (25 °C, 1,000 Wm(-2), IEC 60904-3 global), which is the first certified polymer solar cell efficiency over 10%.
Laren M. Tolbert - One of the best experts on this subject based on the ideXlab platform.
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multilevel dc dc Power Conversion system with multiple dc sources
IEEE Transactions on Power Electronics, 2008Co-Authors: Miaosen Shen, Fang Zheng Peng, Laren M. TolbertAbstract:A multilevel DC-DC Power Conversion system with multiple DC sources is proposed in this paper. With this Conversion system, the output voltage can be changed almost continuously without any magnetic components. With this magnetic-less system, very high temperature operation is possible. Power loss and efficiency analysis is provided in the paper. Comparison results show that the system does not require more semiconductors or capacitance than the traditional boost converter. Experimental results are provided to confirm the analysis and control concept.
David J Perreault - One of the best experts on this subject based on the ideXlab platform.
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opportunities and challenges in very high frequency Power Conversion
Applied Power Electronics Conference, 2009Co-Authors: David J Perreault, Juan M Rivas, Olivia Leitermann, Robert C N Pilawapodgurski, Anthony D Sagneri, Yehui Han, Jingying Hu, Charles R SullivanAbstract:THIS paper explores opportunities and challenges in Power Conversion in the VHF frequency range of 30-300 MHz. The scaling of magnetic component size with frequency is investigated, and it is shown that substantial miniaturization is possible with increased frequencies even considering material and heat transfer limitations. Likewise, dramatic frequency increases are possible with existing and emerging semiconductor devices, but necessitate circuit designs that either compensate for or utilize device parasitics. We outline the characteristics of topologies and control methods that can meet the requirements of VHF Power Conversion, and present supporting examples from Power converters operating at frequencies of up to 110 MHz.
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resistance compression networks for radio frequency Power Conversion
IEEE Transactions on Power Electronics, 2007Co-Authors: Yehui Han, Olivia Leitermann, D A Jackson, J M Rivas, David J PerreaultAbstract:A limitation of many high-frequency resonant inverter topologies is their high sensitivity to loading conditions. This paper introduces a new class of matching networks that greatly reduces the load sensitivity of resonant inverters and radio frequency (RF) Power amplifiers. These networks, which we term resistance compression networks, serve to substantially decrease the variation in effective resistance seen by a tuned RF inverter as loading conditions change. We explore the operation, performance characteristics, and design of these networks, and present experimental results demonstrating their performance. Their combination with rectifiers to form RF-to-dc converters having narrow-range resistive input characteristics is also treated. The application of resistance compression in resonant Power Conversion is demonstrated in a dc-dc Power converter operating at 100MHz
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new architectures for radio frequency dc dc Power Conversion
Power Electronics Specialists Conference, 2004Co-Authors: J M Rivas, Riad S Wahby, J S Shafran, David J PerreaultAbstract:This document proposes new architectures for switched-mode DC/DC Power Conversion. The proposed architectures enable dramatic increases in switching frequency to be realized while preserving features critical in practice, including regulation of the output across a wide load range and high light-load efficiency. This is achieved in part by how the energy Conversion and regulation functions are partitioned. The structure and control approach of the new architectures are described, along with representative implementation methods. The design and experimental evaluation of prototype systems with cells operating at 100 MHz are also described. It is anticipated that the proposed approaches will allow substantial improvements in the size of switching Power converters to be achieved and, in some cases, to permit their integrated fabrication.
Chun-chao Chen - One of the best experts on this subject based on the ideXlab platform.
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solution processed small molecule solar cells breaking the 10 Power Conversion efficiency
Scientific Reports, 2013Co-Authors: Yongsheng Liu, Chun-chao Chen, Jing Gao, Ziruo Hong, Yang Yang, Huanping Zhou, Letian DouAbstract:A two-dimensional conjugated small molecule (SMPV1) was designed and synthesized for high performance solution-processed organic solar cells. This study explores the photovoltaic properties of this molecule as a donor, with a fullerene derivative as an acceptor, using solution processing in single junction and double junction tandem solar cells. The single junction solar cells based on SMPV1 exhibited a certified Power Conversion efficiency of 8.02% under AM 1.5 G irradiation (100 mW cm−2). A homo-tandem solar cell based on SMPV1 was constructed with a novel interlayer (or tunnel junction) consisting of bilayer conjugated polyelectrolyte, demonstrating an unprecedented PCE of 10.1%. These results strongly suggest solution-processed small molecular materials are excellent candidates for organic solar cells.
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10 2 Power Conversion efficiency polymer tandem solar cells consisting of two identical sub cells
Advanced Materials, 2013Co-Authors: Jingbi You, Chun-chao Chen, Ken Yoshimura, Jing Gao, Kenichiro Ohya, Ziruo Hong, Yang YangAbstract:Polymer tandem solar cells with 10.2% Power Conversion efficiency are demonstrated via stacking two PDTP-DFBT:PC₇₁ BM bulk heterojunctions, connected by MoO₃/PEDOT:PSS/ZnO as an interconnecting layer. The tandem solar cells increase the Power Conversion efficiency of the PDTP-DFBT:PC₇₁ BM system from 8.1% to 10.2%, successfully demonstrating polymer tandem solar cells with identical sub-cells of double-digit efficiency.
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a polymer tandem solar cell with 10 6 Power Conversion efficiency
Nature Communications, 2013Co-Authors: Jingbi You, Letian Dou, Chun-chao Chen, Tom Moriarty, Ken Yoshimura, Keith Emery, Jing Gao, T. Kato, Kenichiro Ohya, Gang LiAbstract:Tandem solar cell structures combine high- and low-bandgap materials, allowing a broader spectral absorption of solar radiation. The authors report the synthesis of a high performance low-bandgap polymer which enables fabrication of a tandem solar cell with a certified Power Conversion efficiency of 10.6%.
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A polymer tandem solar cell with 10.6% Power Conversion efficiency
Nature Communications, 2013Co-Authors: Jingbi You, Letian Dou, Ken Ohya, Chun-chao Chen, Tom Moriarty, Ken Yoshimura, Keith Emery, Jing Gao, T. Kato, Gang LiAbstract:An effective way to improve polymer solar cell efficiency is to use a tandem structure, as a broader part of the spectrum of solar radiation is used and the thermalization loss of photon energy is minimized. In the past, the lack of high-performance low-bandgap polymers was the major limiting factor for achieving high-performance tandem solar cell. Here we report the development of a high-performance low bandgap polymer (bandgap 60% and spectral response that extends to 900 nm, with a Power Conversion efficiency of 7.9%. The polymer enables a solution processed tandem solar cell with certified 10.6% Power Conversion efficiency under standard reporting conditions (25 °C, 1,000 Wm(-2), IEC 60904-3 global), which is the first certified polymer solar cell efficiency over 10%.
Jing Gao - One of the best experts on this subject based on the ideXlab platform.
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solution processed small molecule solar cells breaking the 10 Power Conversion efficiency
Scientific Reports, 2013Co-Authors: Yongsheng Liu, Chun-chao Chen, Jing Gao, Ziruo Hong, Yang Yang, Huanping Zhou, Letian DouAbstract:A two-dimensional conjugated small molecule (SMPV1) was designed and synthesized for high performance solution-processed organic solar cells. This study explores the photovoltaic properties of this molecule as a donor, with a fullerene derivative as an acceptor, using solution processing in single junction and double junction tandem solar cells. The single junction solar cells based on SMPV1 exhibited a certified Power Conversion efficiency of 8.02% under AM 1.5 G irradiation (100 mW cm−2). A homo-tandem solar cell based on SMPV1 was constructed with a novel interlayer (or tunnel junction) consisting of bilayer conjugated polyelectrolyte, demonstrating an unprecedented PCE of 10.1%. These results strongly suggest solution-processed small molecular materials are excellent candidates for organic solar cells.
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10 2 Power Conversion efficiency polymer tandem solar cells consisting of two identical sub cells
Advanced Materials, 2013Co-Authors: Jingbi You, Chun-chao Chen, Ken Yoshimura, Jing Gao, Kenichiro Ohya, Ziruo Hong, Yang YangAbstract:Polymer tandem solar cells with 10.2% Power Conversion efficiency are demonstrated via stacking two PDTP-DFBT:PC₇₁ BM bulk heterojunctions, connected by MoO₃/PEDOT:PSS/ZnO as an interconnecting layer. The tandem solar cells increase the Power Conversion efficiency of the PDTP-DFBT:PC₇₁ BM system from 8.1% to 10.2%, successfully demonstrating polymer tandem solar cells with identical sub-cells of double-digit efficiency.
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a polymer tandem solar cell with 10 6 Power Conversion efficiency
Nature Communications, 2013Co-Authors: Jingbi You, Letian Dou, Chun-chao Chen, Tom Moriarty, Ken Yoshimura, Keith Emery, Jing Gao, T. Kato, Kenichiro Ohya, Gang LiAbstract:Tandem solar cell structures combine high- and low-bandgap materials, allowing a broader spectral absorption of solar radiation. The authors report the synthesis of a high performance low-bandgap polymer which enables fabrication of a tandem solar cell with a certified Power Conversion efficiency of 10.6%.
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A polymer tandem solar cell with 10.6% Power Conversion efficiency
Nature Communications, 2013Co-Authors: Jingbi You, Letian Dou, Ken Ohya, Chun-chao Chen, Tom Moriarty, Ken Yoshimura, Keith Emery, Jing Gao, T. Kato, Gang LiAbstract:An effective way to improve polymer solar cell efficiency is to use a tandem structure, as a broader part of the spectrum of solar radiation is used and the thermalization loss of photon energy is minimized. In the past, the lack of high-performance low-bandgap polymers was the major limiting factor for achieving high-performance tandem solar cell. Here we report the development of a high-performance low bandgap polymer (bandgap 60% and spectral response that extends to 900 nm, with a Power Conversion efficiency of 7.9%. The polymer enables a solution processed tandem solar cell with certified 10.6% Power Conversion efficiency under standard reporting conditions (25 °C, 1,000 Wm(-2), IEC 60904-3 global), which is the first certified polymer solar cell efficiency over 10%.
