共发射极
激光器
材料科学
薄脆饼
炼金术中的太阳
能量转换效率
太阳能电池
Nd:YAG激光器
光电子学
分析化学(期刊)
光学
化学
物理
色谱法
作者
Tobias Fellmeth,Hannes Höffler,Sebastian Mack,Eve Krassowski,Katrin Krieg,Bishal Kafle,Johannes Greulich
摘要
Abstract The authors present their work on laser‐enhanced contact optimization (LECO) on i TOPCon solar cells. LECO improves the metal‐semi‐conductor contact resistivity ρ c on the boron emitter and the n‐TOPCon side from an underfired (thermal budget too low) state of 2.9 and 14.1 mΩcm 2 to an enhanced state of 1.8 and 2.9 mΩcm 2 . Therefore, it enables the reduction of the optimal peak firing temperature, which leads to a decrease of metal induced recombination mainly on the boron emitter side and to minor degree on the n‐TOPCon side, as shown in this work. Ultimately, LECO improves i TOPCon solar cells conversion efficiency by 0.6% abs compared with the optimal fired, untreated reference. Submitting those cells to 140°C and 2 suns equivalent irradiation for more than 4 h shows no impact on the conversion efficiency or any sign of light and elevated temperature‐induced degradation (LeTID). Confirmed by ISE CalLab, LECO improved i TOPCon solar cells reach 23.8% and 24.1% conversion efficiency on industrial typical wafer formats and processes.
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