The dual-defect passivation role of lithium bromide doping in reducing the nonradiative loss in CsPbX3 (X = Br and I) quantum dots,Inorganic Chemistry Frontiers

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The dual-defect passivation role of lithium bromide doping in reducing the nonradiative loss in CsPbX3 (X = Br and I) quantum dots
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-11-11 , DOI: 10.1039/d0qi01262a
Hao Wu _{1,

2,

3,

4} , Jianbei Qiu _{1,

2,

3,

4,

5} , Jing Wang _{6,

7,

8,

9,

10} , Yugeng Wen _{1,

2,

3,

4,

5} , Qi Wang _{1,

2,

3,

4,

5} , Zhangwen Long _{1,

2,

3,

4} , Dacheng Zhou _{1,

2,

3,

4,

5} , Yong Yang _{1,

2,

3,

4,

5} , Dazhao Wang _{1,

2,

3,

4}

Affiliation

The non-radiative loss in a perovskite, mainly resulting from thermal defects and halogen vacancies, has always been an important factor affecting its luminescence properties. The addition of a lithium ion has been demonstrated to be an effective way to reduce the nonradiative recombination in perovskite films, mainly acting on the surface/interface of the films. However, few studies have focused on its role in colloidal quantum dots. Herein, we have used LiBr as a new dual-defect passivation agent in colloidal CsPbX₃ (X = Br and I) quantum dots to reduce the capture ability of the defects for excited electrons, leading to an effective reduction of the non-radiative recombination. The mechanism of LiBr doping in CsPbX₃ (X = Br and I) quantum dots was studied by exploring its photodynamic process at room temperature and low temperature. Our results show that an appropriate concentration of LiBr can not only passivate the halide vacancy and thermal defect to reduce the nonradiative recombination, but also improve the phase stability caused by halide migration.

中文翻译：

掺杂溴化锂的双重缺陷钝化作用可减少CsPbX3（X = Br和I）量子点的非辐射损失

钙钛矿中的非辐射损耗（主要由热缺陷和卤素空位引起）一直是影响其发光性能的重要因素。已证明添加锂离子是减少钙钛矿膜中非辐射复合的有效方法，主要作用在膜的表面/界面上。但是，很少有研究集中于其在胶体量子点中的作用。在本文中，我们将LiBr用作胶体CsPbX ₃（X = Br和I）量子点中的新型双缺陷钝化剂，以降低缺陷对激发电子的捕获能力，从而有效地减少了非辐射复合。Lis掺杂在CsPbX ₃中的机理通过探索其在室温和低温下的光动力学过程，研究了（X = Br和I）量子点。我们的结果表明，适当浓度的LiBr不仅可以钝化卤化物的空位和热缺陷，以减少非辐射复合，而且可以改善由卤化物迁移引起的相稳定性。

更新日期：2020-12-17

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