A New Passivation Route Leading to Over 8% Efficient PbSe Quantum‐Dot Solar Cells via Direct Ion Exchange with Perovskite Nanocrystals,Advanced Materials

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A New Passivation Route Leading to Over 8% Efficient PbSe Quantum‐Dot Solar Cells via Direct Ion Exchange with Perovskite Nanocrystals
Advanced Materials ( IF 27.4 ) Pub Date : 2017-09-18 , DOI: 10.1002/adma.201703214
Zhilong Zhang ₁ , Zihan Chen ₁ , Lin Yuan ₁ , Weijian Chen ₁ , Jianfeng Yang ₁ , Bo Wang ₁ , Xiaoming Wen ₁ , Jianbing Zhang ₂ , Long Hu ₁ , John A. Stride ₃ , Gavin J. Conibeer ₁ , Robert J. Patterson ₁ , Shujuan Huang ₁

Affiliation

Colloidal quantum dots (QDs) are promising candidate materials for photovoltaics (PV) owing to the tunable bandgap and low‐cost solution processability. Lead selenide (PbSe) QDs are particularly attractive to PV applications due to the efficient multiple‐exciton generation and carrier transportation. However, surface defects arising from the oxidation of the PbSe QDs have been the major limitation for their development in PV. Here, a new passivation method for chlorinated PbSe QDs via ion exchange with cesium lead halide (Br, I) perovskite nanocrystals is reported. The surface chloride ions on the as‐synthesized QDs can be partially exchanged with bromide or iodide ions from the perovskite nanocrystals, hence forming a hybrid halide passivation. Consistent with the improved photoluminescence quantum yield, the champion PV device fabricated with these PbSe QDs achieves a PCE of 8.2%, compared to 7.3% of that fabricated with the untreated QDs. This new method also leads to devices with excellent air‐stability, retaining at least 93% of their initial PCEs after being stored in ambient conditions for 57 d. This is considered as the first reported PbSe QD solar cell with a PCE of over 8% to date.

中文翻译：

一种新的钝化途径，通过与钙钛矿纳米晶体的直接离子交换，可产生超过8％的高效PbSe量子点太阳能电池

由于可调节的带隙和低成本的溶液可加工性，胶体量子点（QD）是有前途的光伏（PV）候选材料。硒化铅（PbSe）量子点由于其有效的多激子产生和载流子运输而特别吸引了PV应用。但是，由于PbSe QD的氧化而产生的表面缺陷已成为其在PV中发展的主要限制。在这里，报道了一种新的钝化方法，该方法通过与卤化铯铯（Br，I）钙钛矿型纳米晶进行离子交换而对氯化PbSe量子点进行钝化。合成的量子点上的表面氯离子可以与钙钛矿纳米晶体中的溴离子或碘离子部分交换，从而形成混合卤化物钝化。与提高的光致发光量子产率一致，用这些PbSe量子点制造的冠军光伏器件的PCE达到8.2％，而未经处理的量子点制造的7.3％。这种新方法还可以使设备具有出色的空气稳定性，在环境条件下存放57天后，至少可以保留其初始PCE的93％。迄今为止，这被认为是第一个报告的PbSe QD太阳能电池，其PCE超过8％。

更新日期：2017-09-18

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