Light Enhancement of Solar Module

This paper presents sputtered-deposited Ag nanoparticles (NPs) on the encapsulant material (ethylene vinyl acetate, EVA) with the variation of annealing condition on crystalline silicon solar cell to enhance the light intensity, and a conventional solar cell is also performed for comparison. It was found that an increase in the transmittance at the wavelength of 500 - 800 nm was detected in the Ag nanoparticle solar cells. And red-light enhancement of around 2% was measured in the Ag-sputtered solar module under annealing condition of 700℃ for 3 min from incident photon to converted electron (IPCE) profile. The photovoltaic performance of solar modules was characterized by a flasher system in AAA class (temporal instability, spectral match, and irradiance non-uniformity). The IV curve showed a current enhancement with Ag-EVA sample, and thus a high power output around 0.250 W was observed. A high fill factor of 73.63% also implied a high performance in series and shunt resistance. Surface plasmonic resonance effects of Ag nanoparticles deposited on the surface of solar cell were examined and discussed. This paper not only illustrated the performance of the surface plasmonic resonance of a solar device but also verified the application in the industrial production.

Residual stress analysis and bow simulation of crystalline silicon solar cells

目的:建立一套系统的方法来模拟矽晶太阳能电池的翘曲行为,进而分析因翘曲而产生的残留应力。创新点:1.利用纳米压痕实验及电子显微镜测量材料性质及结构尺寸,帮助有限元分析更准确地模拟太阳能电池的翘曲行为;2.提出了2个针对不同矽晶太阳能电池因翘曲产生的简易残留应力的计算公式。方法:1.利用纳米压痕实验测量铝胶及银胶的材料性质,使用电子显微镜测量铝胶及银胶的结构尺寸;2.建立非线性有限元分析模型并与实验结果进行比较(图6),得出不同矽晶太阳能电池残留应力分布结果(图7);3.将简易残留应力公式(公式(6)和(7))和有限元分析得到的结果进行比较(图9)。结论:1.建立了一套有效模拟矽晶太阳能电池翘曲行为的分析方法,该方法包含3个部分:(1)纳米压痕实验测量铝胶和银胶的材料性质;(2)电子显微镜测量细部结构尺寸;(3)非线性有限元分析。利用此方法模拟的翘曲行为较其它计算方法更贴近实验结果。2.该方法不仅能分析不同矽晶太阳能电池的翘曲行为,而且能提供除了翘曲以外的其它信息,比如残留应力。本文提出了2个较为简易的残留应力计算公式,计算不同矽晶太阳能电池因翘曲而产生的残留应力。3.该方法考虑了银胶对矽晶太阳能电池翘曲的影响,在实际应用中可以帮助分析不同银胶的网印方式对矽晶太阳能电池翘曲的影响。本文以帮助某公司设计太阳能电池为例,证明了利用该分析方法在实际应用中帮助公司分析银胶网印的可行性。