Redox-active Eu2O3 nanoflakes as a buffer layer for inverted CsPbI2Br perovskite solar cells with enhanced performance,Journal of Materials Chemistry C

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Redox-active Eu2O3 nanoflakes as a buffer layer for inverted CsPbI2Br perovskite solar cells with enhanced performance
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-09-09 , DOI: 10.1039/d0tc03345f
Siwei Yi _{1,

2,

3,

4,

5} , Dongwei Han _{1,

2,

3,

4,

5} , Quan Yuan _{1,

2,

3,

4,

5} , Qifeng Yang _{1,

2,

3,

4,

5} , Yang Yang _{1,

2,

3,

4,

5} , Dong-Ying Zhou _{1,

2,

3,

4,

5} , Lai Feng _{1,

2,

3,

4,

5}

Affiliation

Solution processed CsPbX₃ films usually present a high content of Pb⁰ clusters, acting as significant defects on the perovskite surface. Conventional electron transport materials, including PC₆₁BM, TiO₂, ZnO, SnO₂ and Nb₂O₅, can hardly passivate these defects. In this work, few-layered Eu₂O₃ nanoflakes (nano-Eu₂O₃) are prepared, which exhibit much higher redox activity towards Pb⁰/I⁰ than the commercial Eu₂O₃ powder. When nano-Eu₂O₃ is introduced as the buffer layer between the CsPbI₂Br and PC₆₁BM layers in inverted perovskite solar cells (PeSC), the devices deliver remarkably improved photovoltaic performance with an average power conversion efficiency (PCE) of 13.47% and a champion PCE of 14.09%, which is much superior to the control devices without nano-Eu₂O₃ (9.74/11.03%). A series of mechanism studies reveal that the addition of nano-Eu₂O₃ buffer layer enables not only more efficient hole-blocking but also remarkably enhanced defect passivation at the perovskite/PC₆₁BM interface, both of which result in significantly reduced interfacial charge recombination. Besides, we show that the devices with nano-Eu₂O₃ exhibit obviously improved thermal stability with >90% PCE remaining after 400 h of thermal aging at 80 °C.

中文翻译：

具有氧化还原活性的Eu2O3纳米薄片作为性能增强的倒置CsPbI2Br钙钛矿太阳能电池的缓冲层

溶液处理的CsPbX ₃薄膜通常呈现高含量的Pb ⁰团簇，在钙钛矿表面上表现为明显的缺陷。包括PC ₆₁ BM，TiO ₂，ZnO，SnO ₂和Nb ₂ O ₅在内的常规电子传输材料几乎不能钝化这些缺陷。在这项工作中，制备了几层的Eu ₂ O ₃纳米薄片（纳米Eu ₂ O ₃），其对Pb ⁰ / I ^0的氧化还原活性比商业Eu ₂ O ₃粉末高得多。当nano-eu ₂在倒钙钛矿太阳能电池（PeSC）中，O ₃被引入作为CsPbI ₂ Br和PC ₆₁ BM层之间的缓冲层，这些器件可显着提高光伏性能，平均功率转换效率（PCE）为13.47％，并具有出色的PCE比例为14.09％，远优于不含纳米Eu ₂ O ₃的控制设备（9.74 / 11.03％）。一系列机理研究表明，添加纳米Eu ₂ O ₃缓冲层不仅可以更有效地阻止空穴，而且可以显着增强钙钛矿/ PC ₆₁处的缺陷钝化。BM界面，这两者都会导致界面电荷重组显着降低。此外，我们表明具有纳米Eu ₂ O ₃的器件在80°C的热老化400 h后具有明显改善的热稳定性，PCE保留> 90％。

更新日期：2020-10-16

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