Highly Stable and Efficient FASnI3 -Based Perovskite Solar Cells by Introducing Hydrogen Bonding.,Advanced Materials

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Highly Stable and Efficient FASnI3 -Based Perovskite Solar Cells by Introducing Hydrogen Bonding.
Advanced Materials ( IF 27.4 ) Pub Date : 2019-09-08 , DOI: 10.1002/adma.201903721
Xiangyue Meng ₁ , Jianbo Lin ₂ , Xiao Liu ₁ , Xin He ₁ , Yong Wang ₃ , Takeshi Noda ₁ , Tianhao Wu ₄ , Xudong Yang ₄ , Liyuan Han _{1,

4}

Affiliation

Tin-based perovskites with narrow bandgaps and high charge-carrier mobilities are promising candidates for the preparation of efficient lead-free perovskite solar cells (PSCs). However, the crystalline rate of tin-based perovskites is much faster, leading to abundant trap states and much lower open-circuit voltage (Voc ). Here, hydrogen bonding is introduced to retard the crystalline rate of the FASnI3 perovskite. By adding poly(vinyl alcohol) (PVA), the OH…I- hydrogen bonding interactions between PVA and FASnI3 have the effects of introducing nucleation sites, slowing down the crystal growth, directing the crystal orientation, reducing the trap states, and suppressing the migration of the iodide ions. In the presence of the PVA additive, the FASnI3 -PVA PSCs attain higher power conversion efficiency of 8.9% under a reverse scan with significantly improved Voc from 0.55 to 0.63 V, which is one of the highest Voc values for FASnI3 -based PSCs. More importantly, the FASnI3 -PVA PSCs exhibit striking long-term stability, with no decay in efficiency after 400 h of operation at the maximum power point. This approach, which makes use of the OH…I- hydrogen bonding interactions between PVA and FASnI3 , is generally applicable for improving the efficiency and stability of the FASnI3 -based PSCs.

中文翻译：

通过引入氢键，高度稳定和高效的基于FASnI3的钙钛矿太阳能电池。

具有窄带隙和高载流子迁移率的锡基钙钛矿是制备高效无铅钙钛矿太阳能电池（PSC）的有希望的候选者。但是，锡基钙钛矿的结晶速率要快得多，从而导致大量的陷阱态和低得多的开路电压（Voc）。在此，引入氢键以延迟FASnI 3钙钛矿的结晶速率。通过添加聚乙烯醇（PVA），PVA与FASnI3之间的OH…I-氢键相互作用具有引入成核位点，减慢晶体生长，引导晶体取向，降低陷阱态和抑制碘离子的迁移。在存在PVA添加剂的情况下，FASnI3-PVA PSC的功率转换效率更高，为8。在反向扫描下为9％，Voc从0.55 V显着提高到0.63 V，这是基于FASnI3的PSC的最高Voc值之一。更重要的是，FASnI3-PVA PSC表现出惊人的长期稳定性，在最大功率点运行400小时后，效率没有下降。这种利用PVA和FASnI3之间的OH…I-氢键相互作用的方法通常适用于提高基于FASnI3的PSC的效率和稳定性。

更新日期：2019-10-16

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