Control of texture structures is an effective method to reduce surface reflectivity and enhance the efficiency of solar cells.In this paper,pyramid structures are prepared on mono-crystalline silicon wafers by cyclode...Control of texture structures is an effective method to reduce surface reflectivity and enhance the efficiency of solar cells.In this paper,pyramid structures are prepared on mono-crystalline silicon wafers by cyclodextrin as surfactant to slow down the etching rate in alcohol-free alkali solution.Compared with volatile alcohol surfactant(e.g.isopropanol,IPA),the cyclodextrin not only possesses a relative high boiling point(1534.4℃),but displays non-toxic and biodegradable properties.Furthermore,the surface morphology,average reflectivity,surface recombination of mono-crystalline silicon wafers were studied in detail.The results show that cyclodextrin can decrease the size and depth of pyramid structures,and thus a lower average reflectivity of 7.5%was obtained.In addition,ray tracing simulation was performed to calculate the photo-generated carrier concentration of PN junction with different sizes of pyramids,and the conclusion is that the carrier concentration of small pyramids is much higher than that of large pyramids.Finally,the average efficiency of large-area mono-crystalline silicon PERC solar cells fabricated by cyclodextrin surfactant was 22.69%,which was 0.43%absolutely higher than that of conventional IPA surfactant.展开更多
采用PC1D软件仿真分析钝化发射极及背接触（passivation emitter and rear contact,PERC）电池;模拟结果表明：降低电池的背表面复合速率有利于增强电池性能、提高电池长波响应。PERC电池由于背表面钝化可采用较低的背场厚度;背钝化层...采用PC1D软件仿真分析钝化发射极及背接触（passivation emitter and rear contact,PERC）电池;模拟结果表明：降低电池的背表面复合速率有利于增强电池性能、提高电池长波响应。PERC电池由于背表面钝化可采用较低的背场厚度;背钝化层中的表面电荷对高背表面复合速率的电池性能的提升作用显著,但在背表面复合速率较低时影响不大;实测得到PERC电池比常规全铝背接触电池的开路电压和短路电流分别增大1.56%和2.56%。展开更多
随着居民分布式太阳能并网发电在电网的发电比重不断增加,提高屋顶光伏发电系统的发电效益是目前的重点内容。本论文介绍采用高效PERC太阳电池屋顶光伏系统的设计及能效分析。首先建立采用高效PERC单晶太阳电池,总功率为9.15 k W,占地50...随着居民分布式太阳能并网发电在电网的发电比重不断增加,提高屋顶光伏发电系统的发电效益是目前的重点内容。本论文介绍采用高效PERC太阳电池屋顶光伏系统的设计及能效分析。首先建立采用高效PERC单晶太阳电池,总功率为9.15 k W,占地50 m2的屋顶光伏系统。其次,利用PVsyst@进行设计模拟,在光伏组件排布方式相同的情况下,研究棚户式和阵列式等不同屋顶的发电效益。对比仿真模拟和系统实测结果,发现采用高效PERC电池棚户式设计方案,在相同的气象资源、占地面积下,较常规太阳电池阵列式设计方案,光伏系统的转换效率提高65%。展开更多
基金supported by the National Key Research and Development Program of China(2018YFB1500500,2018YFB1500200,2020YFB1506503)the National Natural Science Foundation of China(12035020,52072399,62074165,12175305,62104253 and 12105357)the Natural Science Foundation of Beijing Municipality(4192064,1212015)。
文摘Control of texture structures is an effective method to reduce surface reflectivity and enhance the efficiency of solar cells.In this paper,pyramid structures are prepared on mono-crystalline silicon wafers by cyclodextrin as surfactant to slow down the etching rate in alcohol-free alkali solution.Compared with volatile alcohol surfactant(e.g.isopropanol,IPA),the cyclodextrin not only possesses a relative high boiling point(1534.4℃),but displays non-toxic and biodegradable properties.Furthermore,the surface morphology,average reflectivity,surface recombination of mono-crystalline silicon wafers were studied in detail.The results show that cyclodextrin can decrease the size and depth of pyramid structures,and thus a lower average reflectivity of 7.5%was obtained.In addition,ray tracing simulation was performed to calculate the photo-generated carrier concentration of PN junction with different sizes of pyramids,and the conclusion is that the carrier concentration of small pyramids is much higher than that of large pyramids.Finally,the average efficiency of large-area mono-crystalline silicon PERC solar cells fabricated by cyclodextrin surfactant was 22.69%,which was 0.43%absolutely higher than that of conventional IPA surfactant.
文摘采用PC1D软件仿真分析钝化发射极及背接触（passivation emitter and rear contact,PERC）电池;模拟结果表明：降低电池的背表面复合速率有利于增强电池性能、提高电池长波响应。PERC电池由于背表面钝化可采用较低的背场厚度;背钝化层中的表面电荷对高背表面复合速率的电池性能的提升作用显著,但在背表面复合速率较低时影响不大;实测得到PERC电池比常规全铝背接触电池的开路电压和短路电流分别增大1.56%和2.56%。
文摘随着居民分布式太阳能并网发电在电网的发电比重不断增加,提高屋顶光伏发电系统的发电效益是目前的重点内容。本论文介绍采用高效PERC太阳电池屋顶光伏系统的设计及能效分析。首先建立采用高效PERC单晶太阳电池,总功率为9.15 k W,占地50 m2的屋顶光伏系统。其次,利用PVsyst@进行设计模拟,在光伏组件排布方式相同的情况下,研究棚户式和阵列式等不同屋顶的发电效益。对比仿真模拟和系统实测结果,发现采用高效PERC电池棚户式设计方案,在相同的气象资源、占地面积下,较常规太阳电池阵列式设计方案,光伏系统的转换效率提高65%。
