All‐Inorganic CsPbI3 Quantum Dot Solar Cells with Efficiency over 16% by Defect Control,Advanced Functional Materials

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All‐Inorganic CsPbI3 Quantum Dot Solar Cells with Efficiency over 16% by Defect Control
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-10-21 , DOI: 10.1002/adfm.202005930
Linlin Zhang ₁ , Cuiting Kang _{1,

2} , Guizhi Zhang _{1,

2} , Zhenxiao Pan _{1,

2} , Zhaoshuai Huang _{1,

2} , Shuaihang Xu _{1,

2} , Huashang Rao _{1,

2} , Hongbin Liu ₃ , Shengfan Wu ₄ , Xin Wu ₄ , Xiaosong Li ₃ , Zonglong Zhu ₄ , Xinhua Zhong _{1,

2} , Alex K.‐Y. Jen _{4,

5}

Affiliation

All‐inorganic CsPbI₃ quantum dots (QDs) have shown great potential in photovoltaic applications. However, their performance has been limited by defects and phase stability. Herein, an anion/cation synergy strategy to improve the structural stability of CsPbI₃ QDs and reduce the pivotal iodine vacancy (V_I) defect states is proposed. The Zn‐doped CsPbI₃ (Zn:CsPbI₃) QDs have been successfully synthesized employing ZnI₂ as the dopant to provide Zn²⁺ and extra I⁻. Theoretical calculations and experimental results demonstrate that the Zn:CsPbI₃ QDs show better thermodynamic stability and higher photoluminescence quantum yield (PLQY) compared to the pristine CsPbI₃ QDs. The doping of Zn in CsPbI₃ QDs increases the formation energy and Goldschmidt tolerance factor, thereby improving the thermodynamic stability. The additional I⁻ helps to reduce the V_I defects during the synthesis of CsPbI₃ QDs, resulting in the higher PLQY. More importantly, the synergistic effect of Zn²⁺ and I⁻ in CsPbI₃ QDs can prevent the iodine loss during the fabrication of CsPbI₃ QD film, inhibiting the formation of new V_I defect states in the construction of solar cells. Consequently, the anion/cation synergy strategy affords the CsPbI₃ quantum dot solar cells (QDSC) a power conversion efficiency over 16%, which is among the best efficiencies for perovskite QDSCs.

中文翻译：

通过缺陷控制实现效率超过16％的全无机CsPbI3量子点太阳能电池

全无机CsPbI ₃量子点（QD）在光伏应用中显示出巨大潜力。但是，它们的性能受到缺陷和相稳定性的限制。本文提出了一种阴离子/阳离子协同策略，以提高CsPbI ₃ QDs的结构稳定性并减少关键的碘空位（V _I）缺陷状态。掺杂Zn的CsPbI ₃（锌：CsPbI ₃）量子点已经被成功地合成采用ZnI ₂作为掺杂剂，以提供的Zn ²⁺和额外的I ^-。理论计算和实验结果表明，Zn：CsPbI ₃与原始的CsPbI ₃ QD相比，QD显示出更好的热力学稳定性和更高的光致发光量子产率（PLQY）。Zn在CsPbI ₃ QD中的掺杂增加了形成能和Goldschmidt耐受因子，从而提高了热力学稳定性。附加I ^-有助于减小V_我CsPbI的合成过程中的缺陷_3层的QD，导致更高的PLQY。更重要的是，锌的协同效应²⁺和我^-在CsPbI ₃ QD可防止CsPbI的制造过程中的损失碘₃ QD膜，抑制形成新的V_我太阳能电池构造中的缺陷状态。因此，阴离子/阳离子协同策略为CsPbI ₃量子点太阳能电池（QDSC）提供了超过16％的功率转换效率，这是钙钛矿QDSC的最佳效率之一。

更新日期：2020-10-21

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