共查询到9条相似文献,搜索用时 62 毫秒
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Sia Abbaszadeh Edwards 《集成电路应用》2009,(Z1)
光伏产业不仅需要努力达到电网平价(实现成本与传统发电成本相当),同时它也必须保持一套对环境无害的生产方式,从而不会抵消太阳能作为清洁能源的好处。 相似文献
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S. KumariM. Keswani S. SinghM. Beck E. LiebscherP. Deymier S. Raghavan 《Microelectronic Engineering》2011,88(12):3437-3441
Megasonic cleaning is routinely employed in semiconductor industry for cleaning of wafers. However, the method also results in damage to wafer features and such damage has been proposed to arise from transient, imploding cavities formed during megasonic processing. Transient cavitation is associated with the release of light, a phenomenon called sonoluminescence (SL) and the extent of damage has been shown to correlate with the intensity of SL. Control of sonoluminescence may therefore allow control of damage during megasonic processing of wafers. In this study, the ability of carbon dioxide to quench sonoluminescence generation in deionized water exposed to megasonic field of varying power density and duty cycle has been systematically investigated. It has been found that CO2 is not only incapable but also a potent inhibitor of sonoluminescence, providing a potential means for selective alleviation of the violent effects of transient cavitation in process fluids. A novel chemical method has been established for in situ release of CO2 from NH4HCO3 through a pH induced shift in the carbonic acid equilibria in deionized water. Using this method, a precisely controlled, progressive decrease in SL of air saturated deionized water through addition of NH4HCO3 has been demonstrated. It has been determined that 130 ppm of released CO2 is sufficient for complete inhibition of sonoluminescence generated in air saturated deionized water. 相似文献
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Bingbing Chen Pengyang Wang Ningyu Ren Renjie Li Ying Zhao Xiaodan Zhang 《半导体学报》2022,43(5):052201-1-052201-7
Inverted perovskite solar cells (IPSCs) have attracted tremendous research interest in recent years due to their applications in perovskite/silicon tandem solar cells. However, further performance improvements and long-term stability issues are the main obstacles that deeply hinder the development of devices. Herein, we demonstrate a facile atomic layer deposition (ALD) processed tin dioxide (SnO2) as an additional buffer layer for efficient and stable wide-bandgap IPSCs. The additional buffer layer increases the shunt resistance and reduces the reverse current saturation density, resulting in the enhancement of efficiency from 19.23% to 21.13%. The target device with a bandgap of 1.63 eV obtains open-circuit voltage of 1.19 V, short circuit current density of 21.86 mA/cm2, and fill factor of 81.07%. More importantly, the compact and stable SnO2 film invests the IPSCs with superhydrophobicity, thus significantly enhancing the moisture resistance. Eventually, the target device can maintain 90% of its initial efficiency after 600 h storage in ambient conditions with relative humidity of 20%–40% without encapsulation. The ALD-processed SnO2 provides a promising way to boost the efficiency and stability of IPSCs, and a great potential for perovskite-based tandem solar cells in the near future. 相似文献
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Hui Liu Yonggang Zhao Zhijuan Zhang Nour Nijem Yves J. Chabal Heping Zeng Jing Li 《Advanced functional materials》2011,21(24):4754-4762
The design, synthesis, and structural characterization of two new microporous metal‐organic framework (MMOF) structures is reported; Zn(BDC)(DMBPY)0.5·(DMF)0.5(H2O)0.5 (1; H2 BDC = 1,4‐benzenedicarboxylic acid; DMBPY=2,2′‐dimethyl‐4,4′‐bipyridine) and Zn(NDC)(DMBPY)0.5·(DMF)2 (2; H2NDC = 2,6‐naphthalenedicarboxylic acid, DMF=N,N,‐dimethylformamide), which are obtained by functionalizing a pillar ligand with methyl groups. Both compounds are 3D porous structures of the Zn2(L)2(P) type and are made of a paddle‐wheel Zn2(COO)4 secondary building unit (SBU), with the dicarboxylate and DMBPY as linker (L) and pillar (P) ligands, respectively. Comparisons are made to the parent structures Zn(BDC)(BPY)0.5·(DMF)0.5(H2O)0.5 (3; BPY = 4,4′‐bipyridine) and Zn(NDC)(BPY)0.5·(DMF)1.575 (4) to analyze and understand the effect of methyl functionalization. CO2‐adsorption studies indicate substantially enhanced isosteric heats of CO2 adsorption (Qst) for both compounds, as a result of adding methyl groups to the BPY ligand. The CO2 uptake capacity, however, is affected by two opposing and competing factors: the enhancement due to increased MMOF–CO2 interactions (higher Qst values) and detraction due to the surface area and pore‐volume reduction. For 1′ (the guest‐free form of 1), the positive effect dominates, which leads to a significantly higher uptake of CO2 than that of its parent structure 3′ (the guest‐free form of 3). In 2′ (the guest‐free form of 2), however, the negative effect rules, which results in a slightly lower CO2 uptake with respect to 4′ (the guest‐free form of 4). All four compounds exhibit a relatively high separation capability for carbon dioxide over other small gases, including CH4, N2, and O2. The separation ratios of CO2 to O2 and N2 (at 298 K and 1 atm) are 39.8 and 23.5 for compound 1′, 57.7 and 40.2 for 2′, 25.7 and 29.5 for 3′, 89.7, and 20.3 for 4′, respectively. IR and Raman spectroscopic characterization of CO2 interactions with 1′ and 2′ provides indirect support of the importance of the methyl groups in the interaction of CO2 within these systems. 相似文献
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为了能够实时检测出矿井下一氧化碳(CO)浓度,减少煤矿中毒事件,设计了采用可调谐半导体激光器的CO检测仪。采用波长调制光谱(WMS)与可调谐二极管激光吸收光谱(TDLAS)相结合的气体检测技术,将检测信号从低频区域搬到高频区域,然后采用相关技术完成谐波信号的提取,从而检测出CO浓度。实验结果表明,检测下限达到12ppm,能够检测矿井下CO浓度。 相似文献
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