共查询到19条相似文献,搜索用时 156 毫秒
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光电化学过程及其应用研究的部分新成果*王尧宇时茜史启祯(西北大学化学系西安710069)高忆慈(兰州大学化学系兰州730000)关键词光电转换材料新型太阳能电池太阳能利用1光电转换材料及新型太阳能电池1.1REDOX太阳能电池在利用太阳能的过程中,当... 相似文献
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染料敏化太阳能电池中的敏化剂 总被引:5,自引:0,他引:5
染料敏化太阳能电池(DSSC)是一种新型的太阳能电池。染料敏化剂的性能对DSSC的光电转换效率有重要的影响,要获得高的光电转换效率需要有高效、稳定的染料敏化剂。本文介绍了近年来染料敏化剂的设计合成,并讨论了各种敏化剂的优缺点及发展方向。 相似文献
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Ramireddy Rajeswari Nanaji Islavath M. Raghavender Lingamallu Giribabu 《Chemical record (New York, N.Y.)》2020,20(2):65-88
Although the efficiency of Dye‐sensitized and Perovskite solar cell is still below the performance level of market dominance silicon solar cells, in last few years they have grabbed significant attention because of their fabrication ease using low‐cost materials, and henceforth these cells are considered as a promising alternative to commercial photovoltaic devices. However, third generation solar cells have significant absorption in the visible region of solar spectrum, which confines their power conversion efficiency. Subsequently, the performance of current photovoltaics is significantly hampered by the transmission loss of sub‐band‐gap photons. To overcome these issues, rare earth doped luminescent materials is the favorable route followed to convert these transmitted sub‐band‐gap photons into above‐band‐gap light, where solar cells typically have significant light‐scattering effects. Moreover, the rare earth based down/up conversion material facilitates the improvement in sensitization, light‐scattering and device stability of these devices. This review provides insight into the application of various down/up conversion materials for Dye‐sensitized and perovskite solar cell applications. Additionally, the paper discusses the techniques to improve the photovoltaic performance in terms of current density and photo voltage in detail. 相似文献
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《Angewandte Chemie (International ed. in English)》2017,56(11):3045-3049
The design of narrow band gap (NBG) donors or acceptors and their application in organic solar cells (OSCs) are of great importance in the conversion of solar photons to electrons. Limited by the inevitable energy loss from the optical band gap of the photovoltaic material to the open‐circuit voltage of the OSC device, the improvement of the power conversion efficiency (PCE) of NBG‐based OSCs faces great challenges. A novel acceptor–donor–acceptor structured non‐fullerene acceptor is reported with an ultra‐narrow band gap of 1.24 eV, which was achieved by an enhanced intramolecular charge transfer (ICT) effect. In the OSC device, despite a low energy loss of 0.509 eV, an impressive short‐circuit current density of 25.3 mA cm−2 is still recorded, which is the highest value for all OSC devices. The high 10.9 % PCE of the NBG‐based OSC demonstrates that the design and application of ultra‐narrow materials have the potential to further improve the PCE of OSC devices. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(11):3091-3095
The design of narrow band gap (NBG) donors or acceptors and their application in organic solar cells (OSCs) are of great importance in the conversion of solar photons to electrons. Limited by the inevitable energy loss from the optical band gap of the photovoltaic material to the open‐circuit voltage of the OSC device, the improvement of the power conversion efficiency (PCE) of NBG‐based OSCs faces great challenges. A novel acceptor–donor–acceptor structured non‐fullerene acceptor is reported with an ultra‐narrow band gap of 1.24 eV, which was achieved by an enhanced intramolecular charge transfer (ICT) effect. In the OSC device, despite a low energy loss of 0.509 eV, an impressive short‐circuit current density of 25.3 mA cm−2 is still recorded, which is the highest value for all OSC devices. The high 10.9 % PCE of the NBG‐based OSC demonstrates that the design and application of ultra‐narrow materials have the potential to further improve the PCE of OSC devices. 相似文献
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Sol-Gel Processed TiO2 Films for Photovoltaic Applications 总被引:12,自引:0,他引:12
Michael Grätzel 《Journal of Sol-Gel Science and Technology》2001,22(1-2):7-13
The dye sensitized solar cells (DYSC) provides a technically and economically credible alternative concept to present day p-n junction photovoltaic devices. In contrast to the conventional systems where the semiconductor assumes both the task of light absorption and charge carrier transport the two functions are separated here. Light is absorbed by a sensitizer which is anchored to the surface of a wide band gap semiconductor. Charge separation takes place at the interface via photo-induced electron injection from the dye into the conduction band of the solid. Carriers are transported in the conduction band of the semiconductor to the charge collector. The present concepts evolved in the context of research on mesoporous oxide semiconductor films prepared via a sol-gel process. The use of transition metal complexes having a broad absorption band in conjunction with oxide films of nanocrstalline morphology permits to harvest a large fraction of sunlight. Nearly quantitative conversion of incident photons into electric current is achieved over a large spectral range extending over the whole visible region. Overall solar (standard AM 1.5) to electric conversion efficiencies over 10% have been reached. There are good prospects to produce these cells at lower cost than conventional devices. The lecture will present the current state of the field. We shall discuss new concepts of the dye-sensitized nanocrystalline solar cell (DYSC) including solid heterojunction variants and analyze the perspectives for the future development of the technology into the next millennium. 相似文献
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Liguo Jin Jin Zhai Liping Heng Tianxin Wei Liping Wen Lei Jiang Xiaoxu Zhao Xianyou Zhang 《Journal of Photochemistry and Photobiology, C: Photochemistry Reviews》2009,10(4):149-158
Dye-sensitized solar cells (DSSCs) provide a technique and economic alternative concept to present p–n junction photovoltaic devices. For a DSSC, light is absorbed by a sensitizer, which is anchored to the surface of a wide band semiconductor. Charge separation takes place at the interface via photo-induced electron injection from the dye into the conduction band of the semiconductor. Nanocrystalline oxide semiconductor photo-anode films play an important role in photo-electrical conversion efficiency of DSSCs. In this review, we summarize the recent advances of multi-scale structures of DSSCs in the view of bio-inspired materials and analyze the influence factors of a variety of multi-scale structures on photo-electrical conversion in DSSCs, which will provide a strategy for structure design on the novel solar cell. 相似文献
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As one of the major renewable energy sources, solar energy has the potential to become an essential component of future global
energy production. With the increasing demand in energy, the harvesting of solar energy using inexpensive materials and manufacturing
methods has attracted considerable attention. Organic/inorganic (i.e., conjugated polymer/nanocrystal (CP/NC)) nanohybrid
solar cell, including both physically mixed CP/NC composites and covalently linked CP-NC nanocomposites, is one of the several
most promising alternative, cost-effective concepts for solar-to-electric energy conversion that has been offered to challenge
conventional Si solar cells over the past decade. It has low fabrication cost and capability of large-scale production. However,
to date, the highest power conversion efficiency (PCE) of organic/inorganic nanohybrid solar cells has been reported to be
only 5.5%, which is still lower than the theoretical prediction of more than 10%. Several problems, i. e., microscopic phase
separation of semiconducting CPs and NCs, low charge injection, and low carrier collection, have not been well addressed.
More research remains to be done to improve the efficiency of CP/NC nanohybrid solar cells. In this review article, the recent
advances in solving these problems were discussed. For the CP/NC solar cells prepared by physically mixing electron donating
CP and electron accepting NC (i.e., forming CP/NC composites), methods involving the use of solvent mixtures and ligand modification
to control the phase separation at the nanoscale are discussed; the implications of intriguing anisotropic NCs as well as
their assemblies (i.e., NC arrays) on improving the charge collection are presented. For newly developed CP/NC solar cells
prepared by chemically tethering CP chains on the NC surface (i.e., yielding CP-NC nanocomposites, thereby preventing microscopic
phase separation of CP and NC and improving their electronic interaction), recent strategies on the synthesis of such nanocomposites
and their photovoltaic performance are discussed. 相似文献
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Price SC Stuart AC Yang L Zhou H You W 《Journal of the American Chemical Society》2011,133(12):4625-4631
Recent research advances on conjugated polymers for photovoltaic devices have focused on creating low band gap materials, but a suitable band gap is only one of many performance criteria required for a successful conjugated polymer. This work focuses on the design of two medium band gap (~2.0 eV) copolymers for use in photovoltaic cells which are designed to possess a high hole mobility and low highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. The resulting fluorinated polymer PBnDT-FTAZ exhibits efficiencies above 7% when blended with [6,6]-phenyl C(61)-butyric acid methyl ester in a typical bulk heterojunction, and efficiencies above 6% are still maintained at an active layer thicknesses of 1 μm. PBnDT-FTAZ outperforms poly(3-hexylthiophene), the current medium band gap polymer of choice, and thus is a viable candidate for use in highly efficient tandem cells. PBnDT-FTAZ also highlights other performance criteria which contribute to high photovoltaic efficiency, besides a low band gap. 相似文献