金属氧化物多层膜晶体硅太阳电池的背场研究  

RESEARCHON BACK SURFACE FIELD OF SILICON BASED SOLAR CELLS WITH MULTILAYER OXIDE EMITTER

作　　者：林文杰[1,2] 吴伟梁 包杰 刘宗涛[3] 梁宗存 沈辉[1,2,3] Lin Wenjie;Wu Weiliang;Bao Jie;Liu Zongtao;Liang Zongcun;ShenHui(Institute for Solar Energy Systems,Sun Yat-Sen University,Guangzhou 510275,China;State Key Laboratory of Optoelectronic Materials and Technologies,Sun Yat-Sen University,Guangzhou 510006,China;Shunde-SYSU Institute for Solar Energy,Shunde 528311,China)

机构地区：[1]中山大学太阳能系统研究所,广州510275 [2]广东省光伏技术重点实验室,广州510006 [3]顺德中山大学太阳能系统研究所,佛山528311

出　　处：《太阳能学报》2019年第1期62-67,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(61774173)

摘　　要：在n-Si与金属电极之间插入电子选择性材料Ca和Cs_2CO_3、LiF_x,可有效降低接触电阻和界面复合,该文研究Ca和Cs_2CO_3、LiF_x作为背场在氧化钨金属多层膜(WAW)/n-Si太阳电池中对电池性能和稳定性的影响。3种电子选择性材料中,2 nm的LiF_x对电池转换效率的提升最高,稳定性最好。对WAW/n-Si/LiF_x太阳电池R_s的各部分组成进行提取和分析,表明LiF_x/n-Si的接触电阻和LiF_x/Ag接触电阻仅占总串联电阻的0.2%,背场工艺得到最佳的优化。将LiF_x做为背场应用于氧化钒金属多层膜背接触晶体硅(MLBC)太阳电池中,达到19.02%的转换效率,而且用环氧树脂封装的MLBC太阳电池放置在空气中表现出极好的稳定性。In this work,the back surface field of the WAW/n-Si solar cells was optimized by introducing electronselective interfacial layers Ca,Cs2 CO3 and LiFxto isolate n-Si from metal electrode. The interfacial layers can not only reduce the Schottky barrier formed by n-Si/Ag contact dramatically,but also passivate the hetero-contact,resulting in negligible contact resistivity and low surface recombination velocity. By incorporating 2 nm LiFx as the back surfacefield,the WAW/n-Si solar cells demonstrated the best performance and stability. The components of the WAW/n-Si/LiFx solar cell were extracted and analyzed,indicating that the contact resistance of LiFx/n-Si and LiFx/Ag comprised only 0.2% of the total series resistance and the back surface field was optimized. Applying the optimized LiFxas the BSF,an efficiency of 19.02% was achieved for the MLBC solar cell. Furthermore,the MLBC solar cells were encapsulated by epoxy resin and showed high stability when stored in ambient.

关 键 词：晶体硅太阳电池 异质结 金属氧化物 多层膜 背场 无掺杂 背接触 

分 类 号：TM914.41[电气工程—电力电子与电力传动] TK514[动力工程及工程热物理—热能工程]