叠层荧光集光太阳能光伏器件的性能模拟和优化

荧光集光太阳能光伏器件可以减少太阳能电池的用量,有效降低光伏发电的成本.相对于单层荧光 集光太阳能光伏器件,叠层荧光集光太阳能光伏器件能分波段充分利用太阳光谱,提高荧光集光太阳能光伏 器件的效率,进一步降低光伏发电的成本.但是,叠层荧光集光太阳能光伏器件涉及较多的参量,难以通过实验 优化.本文分析了从单层到叠层荧光集光太阳能光伏器件的全部物理过程,建立了数学模型,并相应编制了 计算机模拟软件.运用上述软件,系统研究了器件尺寸、太阳能电池的带隙对光电转换效率的影响.     

Al2O3增强的Co2-C98/Al2O3/Si异质结的光伏效应

随着能源危机的加剧,太阳能电池作为开发和利用太阳能的一种普遍形式, 日益受到世界各国的重视.随着太阳能电池向着高效率、薄膜化、无毒性和原材料丰富的方向发展, 单纯的硅系太阳能电池已经无法达到这样的要求,因此新的材料和工艺的开发利用迫在眉睫. 本文研究了碳材料在硅异质节上实现光伏效应的改善及其可能在太阳能电池上的应用. 采用脉冲激光沉积方法制备的Co₂-C₉₈/Al₂O₃/Si异质结构在标准日光照射 (AM1.5, 100 mW/cm²)条件下,可获得0.447 V的开路电压和18.75 mA/cm²的电流密度, 转换效率可达3.27%.通过电容电压特性和暗条件下的电输运性能测量, 证明了氧化铝层的引入不但对单晶硅的表面起到了物理钝化作用,减小了反向漏电流, 使异质结界面缺陷、界面能级和复合中心减少,还起到了场效应钝化作用, 增加了异质结界面的势垒高度,增加了开路电压,使异质结的光伏效应显著增强.     

太阳能光伏热水系统的能量梯级利用

为了实现太阳能光伏发电系统中用于冷却太阳能电池的低品位热能利用,本文提出了太阳能光伏热水系统。通过对单体光伏光热系统(PV/T)的实验研究表明,在单体PV/T放置角度为30°,流量为200 L/h时,集热效率可达到最大值65.6%,系统的平均发电效率为14.3%,瞬时综合效率最大为83%,达到了能量的梯级利用。     

稀土有机光→电、电→光转换器件

198 6年Ｔａｎｇ发表双层有机光伏电池[1] 与无机光伏电池相比 ,以重量轻 ,材料经济并可以沉积在柔性衬底上等潜在优势正在引起人们注意。目前对有机光伏效应的研究多集中在聚苯乙炔 (ＰＰＶ)及其衍生物上[2 ,3 ] ,能量转换效率在 10ｍＷ·ｃｍ- 2 紫外光照下可超过 4 % [4 ] ;以小分子有机物制成的光伏器件也得到研究人员的关注[5,6] 。但是采用稀土配合物作为电子给体层的有机光伏器件还未见报道。我们研究组一直对以稀土有机配合物为发光层的有机ＥＬ器件进行研究[7,8] 。在研究ＥＬ器件特性过程中 ,我们发现稀土有机电致发光器件在紫外…     

Internal mode of incoherent photovoltaic vector solitons

The internal modes of incoherent vector solitons (IVSs) in photovoltaic photorefractive materials are investigated in the framework of coupled nonlinear Schr\"{o}dinger equations. It is found that there is a pair of internal modes corresponding to a bright--bright IVS. The propagation dynamics of the bright-bright IVS perturbed by the internal modes is simulated by numerical method.     

折射率改变为正的光折变晶体中形成一维光伏暗孤子

提出了一个考虑背景光光伏效应贡献的光伏孤子理论,它指出在折射率变化为正的晶体中,既可产生光伏亮孤子,也可产生光伏暗孤子.当背景光对信号光的有效Glass系数之比为R小于1时,孤子是亮的;R大于1时,孤子是暗的.对亮孤子而言,R值越大,孤子越宽,而对暗孤子,R值越大,孤子越窄.当R为1时,不能形成光伏孤子.一维暗孤子实验结果与理论一致. 关键词： 光折变空间孤子 光伏孤子 暗孤子 正折射率改变     

导电聚苯胺线膜修饰ZnO纳米棒阵列的可控制备及其紫外探测性能

基于p-n结的光生伏特效应可构筑性能优异的UV探测器,本文采用水热法可控制备竖直排列的氧化锌纳米棒阵列(n型ZnO-NRs),利用原位聚合法在ZnO-NRs表面上修饰p型聚苯胺线膜(PANI-NWs),再组装成ZnO-NRs与ZnO-NRs/PANI-NWs紫外探测器.通过扫描电镜(SEM)、X射线衍射仪(XRD)、紫...     

Polarization-enhanced bulk photovoltaic effect of BiFeO3 epitaxial film under standard solar illumination

In this Letter, we report the polarization-enhanced bulk photovoltaic effect (BPV) in pristine BiFeO₃ (BFO) epitaxial film under standard 1 sun AM 1.5 G illumination. High-quality epitaxial BFO films are grown on (001)-oriented niobium doped-SrTiO₃ substrates by pulsed laser deposition. The best BFO film based photovoltaic device achieves a power conversion efficiency of 0.0062% under standard illumination. Besides, it is found that the number of bipolar pulses plays a key role in improving the short-circuit current density and open-circuit voltage. These results are beneficial for further understanding of physical origin of the photovoltaic properties in ferroelectric oxides.     

Development of low concentrated solar photovoltaic system with lead acid battery as storage device

Energy storage system powered by renewable energies is a viable option to meet energy requirement without addition of carbon footprints to the environment. This study involves development of theoretical and computational models for a solar photovoltaic (PV) system coupled with a lead acid battery. The study commenced with selection of most appropriate lead acid battery and PV system for installation in a representative location in Riyadh, Kingdom of Saudi Arabia. Various technical and economic parameters were assessed and calculated by computational approach. The optimized lead acid battery was integrated with low concentration solar PV panels (CPV) followed by a feasibility study. Theoretical model was developed for the integrated system to calculate various parameters of the CPV and lead acid battery. Technical and economic assessment of this coupled unit was calculated using a theoretical approach. The developed model was then subjected to computational approach for verification and validation analysis of the integrated system. The detailed assessment of batteries and integrated system show the applicability of this system in Riyadh region. The research will be extended to develop energy storage systems for remote areas using lead acid batteries.     

巯基卟啉自组装膜的制备及应用研究进展

详细介绍了巯基卟啉自组装膜的几种制备方法,评述了不同制备方法的优缺点;对卟啉自组装膜在电荷转移、分子氧电催化、分子光电器件等领域的研究进展进行了评述,引用文献54篇。