Highly reproducible c-Si texturing by metal-free TMAH etchant and monoTEX agent

Abstract

Surface texturing of a silicon solar cell is critical to provide surface antireflection and light trapping. The common texturing method based on KOH as an etchant with isopropyl alcohol (IPA) as a wetting agent suffers two disadvantages: introducing metal contamination and low repeatability. To circumvent the limitation of the KOHIPA method, we develop a new texturing regime by substituting TMAH for KOH, and a commercial surfactant RENA monoTEX for IPA. This TMAH-monoTEX method shows advantages of non-metal contamination, high reproducibility, short process time and small random pyramids. IBC solar cells fabricated with the TMAHmonoTEX texture achieved an efficiency of 25% with Jsc of 42.9 mA/cm2 , Voc of 719 mV and FF of 81.1%. Show more