Efficient and stable CsPbI3 perovskite quantum dots enabled by in situ ytterbium doping for photovoltaic applications†,Journal of Materials Chemistry A

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Efficient and stable CsPbI3 perovskite quantum dots enabled by in situ ytterbium doping for photovoltaic applications†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-08-10 00:00:00 , DOI: 10.1039/c9ta07143a
Junwei Shi _{1,

2,

3,

4,

5} , Fangchao Li _{1,

2,

3,

4,

5} , Jianyu Yuan _{1,

2,

3,

4,

5} , Xufeng Ling _{1,

2,

3,

4,

5} , Sijie Zhou _{1,

2,

3,

4,

5} , Yuli Qian _{1,

2,

3,

4,

5} , Wanli Ma _{1,

2,

3,

4,

5}

Affiliation

Colloidal perovskite nanocrystals, or quantum dots (QDs), have quickly emerged and exhibited unique opportunities for optoelectronic applications. This is due to their excellent optical and photovoltaic properties as well as composition tunability. Currently, there are only a limited number of publications correlating QD synthesis optimization with relevant device performance. Here, CsPbI₃ QDs have been successfully synthesized and displayed improved optoelectrical properties by implementing an in situ ytterbium (Yb) doping strategy during synthesis. Systematic investigations were carried out to examine the effects of Yb-doping. Preliminary experimental results indicated that Yb³⁺ lanthanide cations could effectively reduce the number of defects and trap states caused by surface and lattice vacancies. This result contributes to an improvement in QD photoluminescence quantum yield (PLQY), material crystallinity, thermal stability and carrier transport. Consequently, the solar cells adopting optimally Yb-doped CsPbI₃ QDs achieved the best power conversion efficiency (PCE) of 13.12% and displayed significantly improved storage stability under ambient conditions. These results indicate that in situ doping has great potential to improve the quality of the resultant perovskite QDs. This approach can provide a new path to a breakthrough in QD based solar cell technology.

中文翻译：

原位掺 y为光伏应用提供了高效稳定的CsPbI ₃钙钛矿量子点†

胶态钙钛矿纳米晶体或量子点（QD）迅速出现，并展现了光电子应用的独特机会。这是由于它们具有出色的光学和光电性能以及组成可调性。当前，仅有少数出版物将QD合成优化与相关设备性能相关联。在这里，通过在合成过程中实施原位（Yb）掺杂策略，已经成功地合成了CsPbI ₃ QD，并显示出改进的光电性能。进行了系统的研究，以检查Yb掺杂的影响。初步实验结果表明，Yb ³⁺镧系阳离子可有效减少表面和晶格空位引起的缺陷数量和陷阱状态。该结果有助于改善QD光致发光量子产率（PLQY），材料结晶度，热稳定性和载流子传输。因此，采用最佳掺Yb的CsPbI ₃ QD的太阳能电池实现了13.12％的最佳功率转换效率（PCE），并在环境条件下显示出显着改善的存储稳定性。这些结果表明，原位掺杂具有很大的潜力来改善所得钙钛矿量子点的质量。这种方法可以为基于量子点的太阳能电池技术的突破提供新的途径。

更新日期：2019-08-10

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