A comprehensive study of parallel gap resistance welding joint between Ag foil and front electrode of GaAs solar cell

Yuhan Ding; Zhichao Wang; Jusha Ma; Chen Shen; Nannan Chen; Xunchun Wang; Kanglong Wu; Lin Wang; Yan Cai; Bin Qian; Xueming Hua

Materials & Design (Aug 2023)

A comprehensive study of parallel gap resistance welding joint between Ag foil and front electrode of GaAs solar cell

Yuhan Ding,
Zhichao Wang,
Jusha Ma,
Chen Shen,
Nannan Chen,
Xunchun Wang,
Kanglong Wu,
Lin Wang,
Yan Cai,
Bin Qian,
Xueming Hua

Affiliations

Yuhan Ding: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
Zhichao Wang: Shanghai Institute of Space Power Sources, 2965 Dongchuan Road, Shanghai 200245, China
Jusha Ma: Shanghai Institute of Space Power Sources, 2965 Dongchuan Road, Shanghai 200245, China
Chen Shen: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; Corresponding authors.
Nannan Chen: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
Xunchun Wang: Shanghai Institute of Space Power Sources, 2965 Dongchuan Road, Shanghai 200245, China
Kanglong Wu: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
Lin Wang: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
Yan Cai: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
Bin Qian: Shanghai Institute of Space Power Sources, 2965 Dongchuan Road, Shanghai 200245, China
Xueming Hua: Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; Corresponding authors.

Journal volume & issue: Vol. 232
p. 112150

Abstract

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When space solar cell array is subjected to harsh temperature cycle, such as planet orbit, thermal fatigue cracks in bonding area are easily induced. With the aim of improving bonding quality and elucidating failure mechanism of parallel gap resistance welding (PGRW) joints in temperature cycling environment, the present research investigates the effect of current density on bonding quality and thermal fatigue behavior of PGRW joint between Ag interconnector and front electrode of GaAs solar cell. When current density is set at 417 A/mm2, a solid diffusion bonding is achieved at the Ag/Au interface, which also possesses adequate joint strength as ensured by both pressure and input energy of PGRW. Crack initiation by thermal fatigue is found at joint edge, which subsequently propagates along the interface as the environment temperature cycling continues. Further investigation reveals that the conducted temperature cycling generates serious tensile and compressive stress in the multi-layered joint structure. Since such reciprocating forces directly induce micro-plastic deformation and strain accumulation at joint interface, failure by crack is finally generated at the joining interface.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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