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Melamine-doped cathode interlayer enables high-efficiency organic solar cells 三聚氰胺掺杂阴极中间层实现了高效有机太阳能电池
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-09-16 DOI: 10.1117/12.2602303
X. Xiong, Xiaonan Xue, Ming Zhang, Tianyu Hao, Zhiyue Han, Yueyang Sun, Yongming Zhang, Feng Liu, Supeng Pei, Lei Zhu
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引用次数: 24
Direct method of extracting broadband complex refractive index from spectrophotometric measurements: an application to polydimethylsiloxane for passive radiative cooling. 从分光光度测量中提取宽带复折射率的直接方法:用于被动辐射冷却的聚二甲基硅氧烷的应用。
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-09-01 DOI: 10.1117/1.jpe.11.032105
Braden Czapla, Leonard Hanssen

We describe an algorithm to extract the complex refractive index of a material from broadband reflectance and transmittance measurements taken by spectrophotometers. The algorithm combines Kramers-Kronig analysis with an inversion of Fresnel's equations to provide a direct method of solving for the refractive index which is accurate, even for weakly absorbing materials, and easily applicable to radiative heat transfer calculations. The algorithm is validated by extracting the complex refractive index of polydimethylsiloxane between 0.25 μm and 100 μm and comparing against existing literature. We also discuss the importance of broadband optical properties to passive radiative cooling and details of the uncertainty analysis of the algorithm.

我们描述了一种从分光光度计的宽带反射率和透射率测量中提取材料复折射率的算法。该算法将Kramers-Kronig分析与菲涅耳方程的反演相结合,提供了一种直接求解折射率的精确方法,即使对弱吸收材料也是如此,并且易于适用于辐射传热计算。通过提取0.25 μm ~ 100 μm范围内聚二甲基硅氧烷的复折射率,并与已有文献进行对比,验证了算法的有效性。我们还讨论了宽带光学特性对被动辐射冷却的重要性以及算法不确定性分析的细节。
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引用次数: 0
Energy in Focus 聚焦能源
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-09-01 DOI: 10.1117/1.jpe.11.030101
Sean Shaheen
Editor-in-Chief Sean Shaheen reflects on the role of JPE in advancing critical technologies toward rapid realization of large-scale change in global energy systems.
总编辑Sean Shaheen反思了JPE在推动关键技术快速实现全球能源系统大规模变革方面的作用。
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引用次数: 0
Resonant absorption for multilayer quantum well and quantum dot solar cells 多层量子阱和量子点太阳能电池的共振吸收
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-09 DOI: 10.1117/1.JPE.12.022203
M. Giteau, Yusuke Oteki, Kento Kitahara, N. Miyashita, R. Tamaki, Y. Okada
Abstract. Epitaxially grown quantum well and quantum dot solar cells suffer from weak light absorption, strongly limiting their performance. Light trapping based on optical resonances is particularly relevant for such devices to increase light absorption and thereby current generation. Compared to homogeneous media, the position of the quantum layers within the device is an additional parameter that can strongly influence resonant absorption. However, this effect has so far received little attention from the photovoltaic community. We develop a theoretical framework to evaluate and optimize resonant light absorption in a thin slab with multiple quantum layers. Using numerical simulations, we show that the position of the layers can make the difference between strong absorption enhancement and completely suppressed absorption, and that an optimal position leads to a resonant absorption enhancement two times larger than average. We confirm these results experimentally by measuring the absorption enhancement from photoluminescence spectra in InAs/GaAs quantum dot samples. Overall, this work provides an additional degree of freedom to substantially improve absorption, encouraging the development of quantum wells and quantum dots-based devices such as intermediate-band solar cells.
摘要外延生长的量子阱和量子点太阳能电池的光吸收较弱,严重限制了其性能。基于光学谐振的光捕获对于这样的器件特别相关,以增加光吸收并由此增加电流产生。与均匀介质相比,量子层在器件内的位置是一个额外的参数,可以强烈影响谐振吸收。然而,到目前为止,这种影响很少受到光伏界的关注。我们开发了一个理论框架来评估和优化具有多个量子层的薄板中的共振光吸收。使用数值模拟,我们表明,层的位置可以决定强吸收增强和完全抑制吸收之间的差异,并且最佳位置导致共振吸收增强比平均值大两倍。我们通过测量InAs/GaAs量子点样品中光致发光光谱的吸收增强,通过实验证实了这些结果。总的来说,这项工作提供了额外的自由度来显著提高吸收,鼓励了量子阱和基于量子点的器件的发展,如中频太阳能电池。
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引用次数: 4
Gallium content-dependent efficiency limits of CIGS solar cells at AM1.5G solar irradiance 在AM1.5G太阳辐照度下CIGS太阳能电池镓含量相关的效率极限
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-01 DOI: 10.1117/1.JPE.11.035501
A. Komilov
Abstract. The gallium content-dependent theoretical limit of the efficiencies of Cu  (  In  ,  Ga  )  Se2 solar cells were studied using a MATLAB model developed based on the Shockley–Queisser detailed balance. The developed model included the temperature dependence of the bandgap according to the gallium content. The original Shockley–Queisser detailed-balance and the developed model at the ASTM G173-03 AM1.5G solar irradiance were used to calculate the gallium content and solar cell temperature-dependent theoretical efficiency limits of a Cu  (  In1  −  xGax  )  Se2-based solar cell. Due to the spectral distribution of the solar irradiance, there were two “peaks” of efficiency: one at values of x around 0.2 prevails at lower temperatures and the other at values of x around 0.6 higher at temperatures above 0°C. Consequently, there is a “pit” with a minimum at x of around 0.5. Values of x corresponding to these values are higher for the temperature-dependent bandgap model. The calculated relative difference between the ultimate efficiency limit and the theoretical efficiency at x  =  0.3 at 310 K is <1  %  .
摘要铜效率的镓含量相关理论极限  (  在里面  ,  Ga  )  Se2太阳能电池使用基于Shockley–Queisser详细天平开发的MATLAB模型进行研究。所开发的模型包括根据镓含量的带隙的温度依赖性。最初的Shockley–Queisser详细天平和ASTM G173-03 AM1.5G太阳辐照度开发的模型用于计算Cu的镓含量和太阳能电池温度相关的理论效率极限  (  In1  −  xGax  )  Se2基太阳能电池。由于太阳辐照度的光谱分布,效率有两个“峰值”:一个在较低的温度下x值约为0.2,另一个在0°C以上的温度下x值约为0.6。因此,在x处存在一个最小值约为0.5的“凹坑”。对于依赖于温度的带隙模型,对应于这些值的x的值更高。x处的极限效率极限与理论效率之间的计算相对差  =  310 K时的0.3小于1  %  .
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引用次数: 3
Size optimization of the front electrode and solar cell using a combined finite-element-genetic algorithm method 基于有限元-遗传算法的前电极和太阳能电池尺寸优化
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-01 DOI: 10.1117/1.JPE.11.034502
Kai Li, Zhuobo Yang, Xianmin Zhang
Abstract. The pattern of the front electrode and the solar cell size has a significant influence on the performance of solar cells. In order to improve the conversion efficiency of solar cells, we present a combined finite-element-genetic algorithm (GA) method for designing the front electrode and solar cell size. In the proposed method, a solar cell is considered to consist of many small unit cells, and these unit cells can well describe the current density and voltage distribution of the solar cell. In the GA, each individual represents a solar cell with a particular size and operates at a particular voltage. The validity of the proposed method is tested on the front electrode and solar cell size design problem of the side-contact and gridded cells. Two existing optimization methods are also used to optimize the front electrode and solar cell size of the two kinds of solar cells. Based on solar cells of different sizes, different optimization results are obtained using either of the two existing optimization methods. The unique optimization result can be obtained using the proposed method, and the optimization result is better than that obtained using the two existing optimization methods.
摘要前电极的形状和太阳能电池的尺寸对太阳能电池的性能有重要的影响。为了提高太阳能电池的转换效率,提出了一种结合有限元-遗传算法(GA)的前电极和太阳能电池尺寸设计方法。在该方法中,太阳能电池被认为是由许多小的单元电池组成,这些单元电池可以很好地描述太阳能电池的电流密度和电压分布。在遗传算法中,每个个体代表一个具有特定尺寸并在特定电压下工作的太阳能电池。以侧接触和栅格电池的前电极和电池尺寸设计问题为例,验证了该方法的有效性。利用现有的两种优化方法对两种太阳能电池的前电极和电池尺寸进行了优化。针对不同尺寸的太阳能电池,现有的两种优化方法得到了不同的优化结果。该方法可获得独特的优化结果,且优化结果优于现有的两种优化方法。
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引用次数: 2
Heterojunction formed by TiO2 supported on lamellar La2NiO4 perovskite for enhanced visible-light-driven photocatalytic hydrogen production 层状La2NiO4钙钛矿负载TiO2形成异质结,增强可见光驱动光催化制氢
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-01 DOI: 10.1117/1.JPE.11.034001
Xinyu Ma, Chaoqian Ai, Jiamei Cao, Jinghua Li, Yizhou Zhu, D. Jing
Abstract. In our work, UV-response with a small visible light absorption TiO2 nanoparticles were supported on lamellar La2NiO4 perovskite to build a type I heterojunction for efficient hydrogen production under visible light. It was found that, with the increase of La2NiO4 contents, the hydrogen production rates gradually increased and amounted to the highest value when the mass fraction of La2NiO4 was 8 wt. %, which is 39.5 times that of the initial La2NiO4 nanosheets without the cocatalyst Pt. When 1 wt. % Pt was loaded, the photocatalytic activity for the composite photocatalyst increased by 369.0 times that of the initial La2NiO4. Our work should be of value for the preparation of visible responsive heterojunction photocatalysts with high activity, fair stability, and low toxicity.
摘要在我们的工作中,在片状La2NiO4钙钛矿上负载具有小可见光吸收的TiO2纳米颗粒的UV响应,以构建用于在可见光下高效制氢的I型异质结。研究发现,随着La2NiO4含量的增加,制氢速率逐渐增加,当La2NiO4-的质量分数为8wt.%时达到最高值,是没有助催化剂Pt的初始La2NiO4.纳米片的39.5倍。当负载1wt.%Pt时,复合光催化剂的光催化活性是初始La2NiO4的369.0倍。我们的工作对制备具有高活性、中等稳定性和低毒性的可见光响应异质结光催化剂具有一定的价值。
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引用次数: 1
Optical design of centered-receiver trough-based CPV system 基于中心接收槽的CPV系统光学设计
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-01 DOI: 10.1117/1.JPE.11.035502
I. Ullah
Abstract. Concentrating photovoltaic (CPV) systems require less area of the solar cell while achieving a high efficiency. One of the development factors in the CPV includes the irradiance uniformity over the solar cell. To overcome this issue, a parabolic trough-based optical design is proposed using two nonimaging secondary reflectors: reflective grooves and compound parabolic concentrator (CPC). The reflective grooves convert the line focus to a square shape irradiance distribution, and the CPC is used for redirecting the rays to the receiver. The proposed system delivers the concentrated light over the solar cell having a size of 30  ×  30  mm2 at the center of the trough. The CPV system reduces the number of cells compared with conventional trough-based CPV systems by attaining the concentration ratio of 285. The results indicate that the system has achieved an optical efficiency of 60% at an acceptance angle of ±2  deg. The detailed optical design and raytracing simulation are presented showing that the proposed concentrator can achieve significantly higher overall concentration while maintaining irradiance uniformity.
摘要聚光光伏(CPV)系统需要较少的太阳能电池面积,同时实现高效率。CPV中的发展因素之一包括太阳能电池上的辐照度均匀性。为了克服这个问题,提出了一种基于抛物面槽的光学设计,使用两个非成像二次反射器:反射槽和复合抛物面聚光器(CPC)。反射槽将线焦点转换为方形辐照度分布,CPC用于将光线重定向到接收器。所提出的系统在尺寸为30的太阳能电池上传输集中的光  ×  30  槽中心的mm2。与传统的基于槽的CPV系统相比,CPV系统通过达到285的浓度比来减少细胞的数量。结果表明,该系统在±2的接受角下实现了60%的光学效率  详细的光学设计和光线跟踪模拟表明,所提出的集中器可以在保持辐照度均匀性的同时实现显著更高的总浓度。
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引用次数: 1
Colored radiative cooling coatings with fluorescence 带荧光的彩色辐射冷却涂层
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-01 DOI: 10.1117/1.JPE.11.032104
R. A. Yalçın, E. Blandre, K. Joulain, J. Drévillon
Abstract. We propose structures that are colored with photoluminescence materials for radiative cooling applications. Using simulations, we show that implementing photoluminescence materials provides color to the structures by shifting electromagnetic energy between spectrums. Resulting additional solar energy absorption due to coloration is lower with photoluminescence compared to the traditional materials used for spectrally selective absorption, such as pigments and nanosized metallic resonators. Thermal and visual performance of different types of photoluminescence materials such as phosphors and quantum dots are investigated. Effects of Stokes shift and quantum yield, which are the photoluminescence properties that characterize the energy shift between spectrums, are quantified.
摘要我们提出了用光致发光材料着色的结构,用于辐射冷却应用。通过模拟,我们表明,实现光致发光材料通过在光谱之间转移电磁能为结构提供颜色。与用于光谱选择性吸收的传统材料(如颜料和纳米尺寸的金属谐振器)相比,通过光致发光,由于着色而产生的额外太阳能吸收更低。研究了不同类型的光致发光材料如磷光体和量子点的热性能和视觉性能。斯托克斯位移和量子产率的影响被量化,这是表征光谱之间能量位移的光致发光特性。
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引用次数: 8
Numerical investigation on solar evaporation properties of nanofluids 纳米流体太阳蒸发特性的数值研究
IF 1.7 4区 工程技术 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-01 DOI: 10.1117/1.JPE.11.034501
Huiling Duan, Tong Ling, Yujie Yan, Yiding Wang
Abstract. The optical absorption and heat transfer properties of fluid can be improved by suspending nanoparticles in a base fluid. Due to the strong photothermal effect around nanoparticles, water around the particles evaporates when exposed to light. Therefore, nanofluids can be used as the working fluid of solar evaporation devices. The evaporation heat transfer model of the Ag nanofluid is established. The temperature distribution and vapor concentration distribution around nanofluids are simulated at low concentrated solar power. Effects of the particle size and volume concentration on the evaporation performance are analyzed. When the volume concentration is small (fv  =  0.01  %  ), the effect of particle size on evaporation is obvious, and the evaporation increases with the increase of particle size. When the particle radius R increases from 5 to 40 nm, the evaporation amount increases 17.8% from 0.0286 to 0.0337 g. For the nanofluids with smaller particle sizes (R  <  20  nm), the evaporation tends to be stable with the increase of concentration, reaching about 0.0318 g. For the nanofluids with larger particle sizes (R  =  40  nm), the evaporation decreases significantly with the increased concentration. When the volume concentration increases from 0.01% to 0.1%, the evaporation decreases from 0.0337 to 0.0288 g. Therefore, the particle size and volume concentration should be considered comprehensively when choosing nanofluids as evaporation working fluids. When the volume concentration is >0.05  %  , the nanofluids with smaller particle sizes should be selected. We provide guidance for the utilization of nanofluids for solar evaporation.
摘要通过将纳米颗粒悬浮在基础流体中,可以改善流体的光学吸收和传热性能。由于纳米颗粒周围的强光热效应,当暴露在光下时,颗粒周围的水会蒸发。因此,纳米流体可以用作太阳能蒸发装置的工作流体。建立了银纳米流体的蒸发传热模型。模拟了低浓度太阳能下纳米流体周围的温度分布和蒸汽浓度分布。分析了颗粒大小和体积浓度对蒸发性能的影响。当体积浓度较小时(fv  =  0.01  %  ), 颗粒大小对蒸发量的影响明显,蒸发量随颗粒大小的增加而增加。当颗粒半径R从5纳米增加到40纳米时,蒸发量从0.0286克增加到0.0337克,增加了17.8%。对于具有较小颗粒尺寸的纳米流体(R  0.05  %  , 应当选择具有较小颗粒尺寸的纳米流体。我们为利用纳米流体进行太阳能蒸发提供指导。
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引用次数: 0
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Journal of Photonics for Energy
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