毕业设计（论文）-酸法制绒下减薄量对多晶硅太阳能电池片电性能的影响..docVIP

PAGE 酸法制绒下减薄量对多晶硅太阳能电池片电性能的影响摘 要多晶硅太阳能电池的出现在很大程度上降低了材料的制作成本，然而其光电转换效率并没有单晶硅太阳电池的高。其中主要有两个原因：一方面是由于多晶硅材料具有晶界、高密度的位错、微缺陷和相对较高的杂质浓度，降低了有效少数载流子寿命；另一方面，多晶硅片表面的陷光效果要比单晶硅差，不能很好地吸收和利用太阳光。本实验采用酸法制绒工艺，通过控制多晶硅片的减薄量，研究绒面大小对多晶硅太阳能电池片电性能的影响，进而确定工艺参数提高多晶硅太阳能电池片的光电转换效率。结果表明：减薄量在0.35-0.4g时电池片的串并联电阻均最小，反射率最低，但由于此时的漏电流最大，使得最终光电转换效率低于理论值； 减薄量控制在在0.4-0.45g时，多晶硅太阳能电池片的串并联电阻较小，但此时的漏电流和反射率较小，使得多晶硅太阳能电池片的开路电压和短路电流达到最大，光电转换效率最高为15.7664%0.5g时，关键词：多晶太阳能电池片，酸法制绒，减薄量，光电转换效率，漏电流，反射率 The Influence of Corrosion Quantity to the Multi-crystalline silicon cellsPerformance under the Acidc EcthABSTRACTMulti-crystalline silicon solar cells have greatly reduced the production cost of materials when It is appeared,but its eff is not higher than mon-crystalline silicon solar .there are two main reasons:on the one hand Multi-crystalline silicon has grain boundaries、high-density dislocation、Micro-defects and relatively higher impurities density,which reduced effective minority carriers life.On the other hand ,Multi-crystalline silicon wafer surface of sink light effect is worse than mon-crystalline silicon.The experiment using acid corrosion process,through the control of multi-crystalline silicon wafers corrosion quantity ,researches how the suede size influence the multi-crystalline silicon cellsperformance,then determine process Parameters to improve solar-cells photoelectric conversion efficiency.The results show that:when the corrosion quantity is between 0.35g and 0.4g, Rs and Rsh are both minimum， the reflctivity is lowest ，but the Irev is maximum，so the photoelectric conversion efficiency is lower than theortical.when the corrosion quantity is controled between 0.4g and 0.45g,The Rs and Rsh are both lower than the former，but the Irve and reflectivity are both smaller，so that the Uoc and Isc of the multi-crystalline silicon cells both reached maximum and the highest photoelectric conversion efficiency is 15.7664%. when the corrosion quantity is controled between 0.45g and 0.5g，The Rs and Rsh are bot