Zinc ion functional doping for all-inorganic planar CsPbIBr2 perovskite solar cells with efficiency over 10.5%,Journal of Materials Chemistry C

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Zinc ion functional doping for all-inorganic planar CsPbIBr2 perovskite solar cells with efficiency over 10.5%
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-12-29 , DOI: 10.1039/d0tc05455k
Yongjin Long _{1,

2,

3,

4,

5} , Chenyang Wang _{1,

2,

3,

4,

5} , Xiaohui Liu _{1,

2,

3,

4,

5} , Jiahao Wang _{1,

2,

3,

4,

5} , Shiqiang Fu _{1,

2,

3,

4,

5} , Jing Zhang _{1,

2,

3,

4,

5} , Ziyang Hu _{1,

2,

3,

4,

5} , Yuejin Zhu _{1,

2,

3,

4,

5}

Affiliation

The all-inorganic CsPbIBr₂ perovskite solar cell (PSC) has received tremendous attention due to its favorable photoelectric properties and superior stability against moisture and heat attack. Nevertheless, the reported power conversion efficiency (PCE) of CsPbIBr₂ PSC is still far from its counterparts, mainly because of the inferior film crystallization and morphology of the CsPbIBr₂ light-absorbing layer, along with much trap defects and severe charge recombination. Herein, all-inorganic perovskite CsPbIBr₂ is doped with ZnBr₂ to improve crystallinity and morphology, optimize energy level alignment and enhance photovoltaic performance of PSC. Consequently, with the optimized concentration of Zn²⁺ (1%, at.), CsPb_0.99Zn_0.01IBr₂-based PSC shows the highest PCE of 10.51%, which is 34% higher than that of CsPbIBr₂-based PSCs (7.84%). Furthermore, the unencapsulated CsPb_0.99Zn_0.01IBr₂-based device exhibits superior long-term stability in ambient atmosphere and against heat. This study provides a feasible strategy for preparing a high quality perovskite film and improving the photovoltaic performance and long-term stability of CsPbIBr₂ PSCs, aiming at promoting the potential applications of CsPbIBr₂-based PSCs.

中文翻译：

用于全无机平面CsPbIBr2钙钛矿太阳能电池的锌离子功能掺杂，效率超过10.5％

全无机CsPbIBr ₂钙钛矿太阳能电池（PSC）由于其良好的光电性能以及优异的防潮和防热稳定性而备受关注。尽管如此，所报道的CsPbIBr ₂ PSC的功率转换效率（PCE）仍远未达到其等效值，这主要是由于CsPbIBr ₂光吸收层的薄膜结晶度和形态较差，以及许多陷阱缺陷和严重的电荷重组。在此，全无机钙钛矿CsPbIBr ₂掺杂有ZnBr ₂以改善结晶度和形态，优化能级排列并增强PSC的光伏性能。因此，具有最佳的Zn浓度²⁺（1％，at。），基于CsPb_0.99 Zn_0.01 IBr₂的PSC显示最高PCE为10.51％，比基于CsPbIBr₂的PSC（7.84％）高34％。此外，未封装的基于CsPb_0.99 Zn_0.01 IBr₂的器件在环境大气中和抗热方面表现出优异的长期稳定性。这项研究为制备高质量钙钛矿薄膜并改善CsPbIBr₂ PSC的光伏性能和长期稳定性提供了可行的策略，旨在促进基于CsPbIBr₂的PSC的潜在应用。

更新日期：2021-01-20

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