Design of advanced porous silver powder with high-sintering activity to improve silicon solar cells  

作　　者：Yongsheng Li Ziwei Chen Rui Zhou Wenguang Zhao Mu Li Jun Chen Zhongyuan Huang Jian Liu Yuhang Li Maolin Yang Minghan Yu Dong Zhou Yuan Lin Feng Pan 

机构地区：[1]School of Advanced Materials,Peking University,Shenzhen Graduate School,Shenzhen 518055,China [2]Institute of Advanced Science Facilities,Shenzhen 518107,China [3]Institute of Zhejiang University-Quzhou,Quzhou 324000,China [4]Key Laboratory of Photochemistry,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [5]Institute of Materials Research(IMR),Tsinghua University,Tsinghua Shenzhen International Graduate School,Shenzhen 518055,China [6]School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China

出　　处：《Nano Research》2024年第4期3189-3197,共9页纳米研究（英文版）

基　　金：support of the Soft Science Research Project of Guangdong Province(No.2017B030301013);the Guangdong Innovative Team Program(No.2013N080);the Guangdong Province Major Talent Introducing Program(No.2021QN020687).

摘　　要：Silver(Ag)paste is widely used in semiconductor metallization,especially in silicon solar cells.Ag powder is the material with the highest proportion in Ag paste.The morphology and structure of Ag powder are crucial which determine its characteristics,especially for the sintering activity.In this work,a simple method was developed to synthesize a type of microcrystalline spherical Ag particles(SP-A)with internal pores and the structural changes and sintering behavior were thoroughly studied by combining ultra-small-angle X-ray scattering(USAXS),small-angle X-ray scattering(SAXS),in-situ heating X-ray diffraction(XRD),focused ion beam(FIB),and thermal analysis measurement.Due to the unique internal pores,the grain size of SP-A is smaller,and the coefficient of thermal expansion(CTE)is higher than that of traditional solid Ag particles.As a result,the sintering activity of SP-A is excellent,which can form a denser sintered body and form silver nanoparticles at the Ag–Si interface to improve silver silicon contact.Polycrystalline silicon solar cell built with SP-A obtained a low series resistance(Rs)and a high photoelectric conversion efficiency(PCE)of 19.26%.These fill a gap in Ag particle structure research,which is significant for the development of high-performance electronic Ag particles and efficient semiconductor devices.

关 键 词：silver particles small angle X-ray scattering(SAXS) pore size distribution in-situ heating X-ray diffraction(XRD) SINTERING silicon solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动]