Recombination and Resistive Losses of Transferred Foil Contacts for Silicon Heterojunction Solar Cells,Physica Status Solidi-Rapid Research Letters

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Recombination and Resistive Losses of Transferred Foil Contacts for Silicon Heterojunction Solar Cells
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-09-02 , DOI: 10.1002/pssr.202000368
Nafis Iqbal _{1,

2} , Mengjie Li _{1,

2} , Geoffrey Gregory _{1,

2} , Som Dahal ₃ , Stuart Bowden ₃ , Kristopher O. Davis _{1,

2,

4,

5}

Affiliation

Silicon heterojunction (SHJ) solar cells have been studied extensively due to their potential to reach high energy conversion efficiencies. However, one of the limiting factors for this technology is the metallization, which uses low‐curing‐temperature silver pastes that result in fingers with higher bulk resistivity. Herein, a simple approach to fabricate the SHJ solar cell contacts is demonstrated with commercially available low‐cost silver (Ag) electrically conductive adhesive (ECA) pastes and aluminium (Al) foils. This technique can result in a transparent conductive oxide (TCO)‐free cell structure and has the potential to combine cell metallization and interconnection. Recombination and resistive loss analyses are performed on the fabricated test samples. A dark saturation current density at the contact (J_0c) of 3.05 fA cm⁻² for test samples before annealing is reported. The analysis of the experimental and simulated photoluminescence (PL) images shows negligible added recombination. The contact resistivity (ρ_c) value is 49.3 mΩ cm² after annealing which can be optimized by specialized ECA pastes.

中文翻译：

硅异质结太阳能电池转移箔接触的重组和电阻损耗

由于硅异质结（SHJ）太阳能电池具有实现高能量转换效率的潜力，因此已进行了广泛的研究。但是，该技术的限制因素之一是金属化，它使用了低固化温度的银浆，从而导致手指的整体电阻率更高。本文中，使用市售的低成本银（Ag）导电胶（ECA）糊剂和铝（Al）箔展示了一种简单的制造SHJ太阳能电池触点的方法。该技术可以形成无透明导电氧化物（TCO）的电池结构，并具有将电池金属化和互连结合在一起的潜力。在制造的测试样品上进行重组和电阻损耗分析。触点处的暗饱和电流密度（J报道了退火之前测试样品的3.05fA cm ^-2的_0c）。对实验和模拟的光致发光（PL）图像的分析显示添加的重组几乎可以忽略不计。接触电阻率（ρ _{c ^}）值是49.3毫欧厘米²退火后其可通过专门ECA糊剂进行优化。

更新日期：2020-11-02

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