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Phase-Stable Wide-Bandgap Perovskites for Four-Terminal Perovskite/Silicon Tandem Solar Cells with Over 30% Efficiency
Small ( IF 13.3 ) Pub Date : 2022-07-27 , DOI: 10.1002/smll.202203319
Yuxin Yao 1 , Pengjie Hang 1 , Biao Li 1 , Zechen Hu 1 , Chenxia Kan 1 , Jiangsheng Xie 2 , Ying Wang 1 , Yiqiang Zhang 3 , Deren Yang 1 , Xuegong Yu 1
Affiliation  

Wide-bandgap perovskite solar cells (PSCs) with an optimal bandgap between 1.7 and 1.8 eV are critical to realize highly efficient and cost-competitive silicon tandem solar cells (TSCs). However, such wide-bandgap PSCs easily suffer from phase segregation, leading to performance degradation under operation. Here, it is evident that ammonium diethyldithiocarbamate (ADDC) can reduce the detrimental I2 back to I in precursor solution, thereby reducing the density of deep level traps in perovskite films. The resultant perovskite film exhibits great phase stability under continuous illumination and 30–60% relative humidity conditions. Due to the suppression of defect proliferation and ion migration, the PSCs deliver great operation stability which retain over 90% of the initial power conversion efficiency (PCE) after 500 h maximum power point tracking. Finally, a highly efficient semitransparent PSC with a tailored bandgap of 1.77 eV, achieving a PCE approaching 18.6% with a groundbreaking open-circuit voltage (VOC) of 1.24 V enabled by ADDC additive in perovskite films is demonstrated. Integrated with a bottom silicon solar cell, a four-terminal (4T) TSC with a PCE of 30.24% is achieved, which is one of the highest efficiencies in 4T perovskite/silicon TSCs.

中文翻译:

用于四端钙钛矿/硅串联太阳能电池的相稳定宽带隙钙钛矿,效率超过 30%

最佳带隙在 1.7 到 1.8 eV 之间的宽带隙钙钛矿太阳能电池 (PSC) 对于实现高效且具有成本竞争力的硅串联太阳能电池 (TSC) 至关重要。然而,这种宽带隙 PSC 很容易出现相分离,导致运行时性能下降。在这里,很明显二乙基二硫代氨基甲酸铵 (ADDC) 可以将有害的 I 2还原为 I -在前体溶液中,从而降低钙钛矿薄膜中深能级陷阱的密度。所得钙钛矿薄膜在连续光照和 30-60% 相对湿度条件下表现出良好的相位稳定性。由于抑制了缺陷扩散和离子迁移,PSC 具有出色的运行稳定性,在最大功率点跟踪 500 小时后仍保持初始功率转换效率 (PCE) 的 90% 以上。最后,一种高效的半透明 PSC 具有 1.77 eV 的定制带隙,实现了接近 18.6% 的 PCE,具有开创性的开路电压 ( V OC) 的 1.24 V 由 ADDC 添加剂在钙钛矿薄膜中实现。与底部硅太阳能电池集成,实现了 PCE 为 30.24% 的四端 (4T) TSC,这是 4T 钙钛矿/硅 TSC 中效率最高的之一。
更新日期:2022-07-27
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