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排序方式: 共有223条查询结果,搜索用时 17 毫秒
201.
《Current Applied Physics》2014,14(3):294-299
A unique composite of TiO2 nanoparticles (NPs) and nanorods (NRs) has been used to fabricate a photoelectrode for developing dye-sensitized solar cells (DSSCs) with higher sensitivity. The TiO2 nanorods were synthesized using a mechanical process, in which electrospun TiO2 nanofibers was grinded in a controlled way to obtain uniform size distribution. The characteristics of electron transport, recombination lifetime and charge collection were investigated by intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS). Photoelectrodes prepared with the composites of NRs and NPs showed significant improvements in electron transportation compared to only NP photoelectrodes, which would enhance the photovoltaic performance of DSSCs. IMPS and IMVS measurements show that fast electron transport and slightly decreased recombination lifetime resulted in the improvement of efficiency. The highest energy conversion efficiency obtained from the photoelectrodes fabricated with the as-prepared rutile TiO2 nanofibers at 5 wt% NR content was up to 6.1% under AM1.5G solar illumination. The results demonstrate that the composite nanostructure can take advantage of both the fast electron transport of the nanorods and the high surface area of the nanoparticles. 相似文献
202.
Wangqiao Chen Qian Zhang Teddy Salim Sandy Adhitia Ekahana Xiangjian Wan Tze Chien Sum Yeng Ming Lam Alfred Hon Huan Cheng Yongsheng Chen Qichun Zhang 《Tetrahedron》2014
A novel C60 solar cell acceptor (BTOQC, benzo[2,1,3]-thiadiazole-o-quinodimethane-C60 bisadducts) based on benzo[2,1,3]thiadiazole has been synthesized as model to study how the thiadiazole group will affect the device performance in bulk heterojunction organic photovoltaics (BHJ-OPV) with poly(3-hexylthiophene) (P3HT) as donor. The optoelectronic, electrochemistry, and photovoltaic properties of the novel bisadduct BTOQC have been fully investigated. The best device performance of this fullerene derivative in our research was obtained as 2.50% with a high Voc of 0.74 V. 相似文献
203.
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204.
Yuanxin Liang Tengfei Li Yuhsuan Lee Zhenzhen Zhang Yawen Li Wenqin Si Zesheng Liu Chuang Zhang Yan Qiao Shuming Bai Yuze Lin 《Angewandte Chemie (International ed. in English)》2023,62(12):e202217989
Efficient in situ deposition of metallic cocatalyst, like zero-valent platinum (Pt), on organic photovoltaic catalysts (OPCs) is the prerequisite for their high catalytic activities. Here we develop the OPC (Y6CO), by introducing carbonyl in the core, which is available to σ-π coordinate with transition metals, due to the high-energy empty π* orbital of carbonyl. Y6CO exhibits a stronger capability to anchor Pt species and reduce them to metallic state, resulting in more Pt0 deposition, relative to the control OPC without the central σ-π anchor. Single-component and heterojunction nanoparticles (NPs) employing Y6CO show enhanced average hydrogen evolution rates of 230.98 and 323.22 mmol h−1 g[OPC]−1, respectively, under AM 1.5G, 100 mW cm−2 for 10 h, and heterojunction NPs yield the external quantum efficiencies of ca. 10 % in 500–800 nm. This work demonstrates that σ-π anchoring is one efficient strategy for integrating metallic cocatalyst and OPC for high-performance photocatalysis. 相似文献
205.
Jianqiu Wang Yafei Wang Jiayao Li Yue Yu Pengqing Bi Jiawei Qiao Zhihao Chen Chaoyi Wang Wenxuan Wang Jiangbo Dai Xiaotao Hao Shaoqing Zhang Jianhui Hou 《Angewandte Chemie (International ed. in English)》2023,62(50):e202314362
Organic photovoltaic (OPV) cells, with highly tunable light-response ranges, offer significant potential for use in driving low-power consumption off-grid electronics in multi-scenarios. However, development of photoactive layer materials that can meet simultaneously the requirements of diverse irradiation conditions is a still challenging task. Herein, a low-cost fully non-fused acceptor (denoted as GS60) featuring well-matched absorption spectra with solar, scattered light and artificial light radiation was designed and synthesized. Systematic characterizations revealed that GS60 possessed outstanding photoelectron properties and ideal morphology, which resulted in reduced voltage loss and suppressed charge recombination. By blending with a non-fused ring polymer PTVT−T, the as-obtained GS60 based OPV cells achieved a good power conversion efficiency (PCE) of 14.1 %, a high value for the cells based on non-fused ring bulk heterojunction. Besides, manufactured large-area OPV modules based on PTVT−T:GS60 yielded PCEs of 11.2 %, 11.8 %, 12.1 %, 23.1 %, and 20.3 % under irradiation of AM 1.5G, natural light of cloudy weather, natural light in shadow, laser and indoor, respectively. The PTVT−T:GS60 devices exhibited considerable potential in terms of improving photostability and reducing material cost. Overall, this work provides novel insight into the molecular design of low-cost non-fused ring acceptors, and extended potential of medium band gap acceptors based OPV cells used in various application scenarios. 相似文献
206.
Perovskite solar cells (PSCs) are highly efficient and are comparatively cheaper than the large silicon crystals primarily used in solar cells. Their outstanding photovoltaic performance makes them a potential alternative to silicon solar cells. While efficiency and photovoltaic performance have been investigated in recent decades, a knowledge gap on the degradation, economic feasibility and stability of PSCs exists, and their poor stability remains a barrier to commercialization. Thus, this review aims to fill this knowledge gap by focusing on approaches to improve PSCs’ thermal and chemical stability, and their economic viability under different conditions. The structure and manufacture of PSCs are also discussed along with an economic analysis of different perovskite devices. Improvements in thermal stability can be reached by incorporating inorganic materials into the PSC. A PSC model optimized with ZnO improves chemical stability by 8% and works well under low temperatures. To make PSCs more economically feasible, certain parts like counter electrodes (CE) and hole transport materials (HTMs) can be replaced with alternative elements like carbon and inorganic HTMs, respectively. PSCs with long durability and high conversion efficiency will expand the commercial prospects for this material. To bridge the lack of knowledge, further investigation is required on the sustainability and longevity of PSCs. 相似文献
207.
Chris M. Sparks Sidi Lanee Meredith Beebe Matthew Page 《Spectrochimica Acta Part B: Atomic Spectroscopy》2008
In this study, the capabilities of total reflection X-ray fluorescence spectroscopy characterization for both the photovoltaic industry and advanced semiconductor processing were investigated. Analysis of single crystal silicon coupon samples from various cleans during photovoltaic processing showed that certain clean steps were more effective in removing trace metal contamination. The multicrystalline photovoltaic silicon sample also had detected, but difficult to quantify, metallic contamination. Changes in the silicon dioxide content of hafnium silicate films used in semiconductor processing were also characterized by total reflection X-ray fluorescence spectroscopy analysis. 相似文献
208.
209.
M. Souilah C. Guillot-Deudon S. Harel M. Evain 《Journal of solid state chemistry》2010,183(10):2274-2280
Structures of compounds in the Cu2Se-In2Se3-Ga2Se3 system have been investigated through X-ray diffraction. Single crystal structure studies for the so-called stoichiometric compounds Cu(In,Ga)Se2 (CIGSe) confirm that the chalcopyrite structure (space group I4¯2d) is very flexible and can adapt itself to the substitution of Ga for In. On the other hand a structure modification is evidenced in the Cu1−z(In0.5Ga0.5)1+z/3Se2 series when the copper vacancy ratio (z) increases; the chalcopyrite structure turns to a modified-stannite structure (I4¯2m) when z≥0.26. There is a continuous evolution of the structure from Cu0.74(In0.5Ga0.5)1.09Se2 to Cu0.25(In0.5Ga0.5)1.25Se2 ((i.e. Cu(In0.5Ga0.5)5Se8), including Cu0.4(In0.5Ga0.5)1.2Se2 (i.e. Cu(In0.5Ga0.5)3Se5). From this single crystal structural investigation, it is definitively clear that no ordered vacancy compound exists in that series. X-ray photoemission spectroscopy study shows for the first time that the surface of powdered Cu1−z(In0.5Ga0.5)1+z/3Se2 compounds (z≠0) is more copper-poor than the bulk. The same result has often been observed on CIGSe thin films material for photovoltaic applications. In addition, optical band gaps of these non-stoichiometric compounds increase from 1.2 to 1.4 eV when z varies from 0 to 0.75. 相似文献
210.
Lu Zhang 《Tetrahedron》2010,66(18):3318-16
Four triarylamine derivatives (XS6-9) containing N,N-dimethylaryl amine units as secondary electron-donating groups are designed and synthesized. These dyes were applied into nanocrystalline TiO2 dye-sensitized solar cells through standard operations. For a typical device the maximal monochromatic incident photon-to-current conversion efficiency (IPCE) can reach 93%, with a short-circuit photocurrent density (Jsc) 10.8 mA cm−2, an open-circuit photovoltage (Voc) 690 mV, and fill factor (FF) 0.61, which corresponds to an overall conversion efficiency of 4.54%. 相似文献