Investigation of the Interactions Between Low-Temperature Ag Paste Components and SiO2/Poly-Si(n) Contacts and the Impact on Contact Properties
Reducing poly-Si thickness to minimize parasitic absorption on a light-receiving side of a TOPCon solar cell without suffering voltage losses after metallization is a challenge in optimizing TOPCon performance. As an alternative to fire-through pastes, we investigate low-temperature Ag paste to SiO2/poly-Si passivating contacts through fabrication of electrical test structures to characterize the passivation quality and electrical transport across the metallized interface. With current paste chemistries, we find that solvent wetting of the poly-Si surface before evaporation and non-volatile binder resin adhesion to the surface after curing are major impediments which prevent Ag contact formation. However, low- resistance poly-Si/Ag interfaces formed with physical vapour deposition similarly degrade after annealing, indicating contacting issues related to the Ag content even in the absence of the organic paste components.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1889659
- Report Number(s):
- NREL/CP-5900-79981; MainId:41186; UUID:ab8c1a3b-8fc6-40b6-b8e0-0c9f04fa9f9a; MainAdminID:62871
- Resource Relation:
- Conference: Presented at SiliconPV 2021: The 11th International Conference on Crystalline Silicon Photovoltaics, 19-23 April 2021, Hamelin, Germany
- Country of Publication:
- United States
- Language:
- English
Similar Records
Self-Aligned, Selective Area Poly-Si/SiO2 Passivated Contacts for Enhanced Photocurrent in Front/Back Solar Cells: Preprint
Self-Aligned, Selective Area Poly-Si/SiO2 Passivated Contacts for Enhanced Photocurrent in Front/Back Solar Cells