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A residual strain regulation strategy based on quantum dots for efficient perovskite solar cells
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-12-01 , DOI: 10.1039/d2ta07593h Yinyan Xu 1 , Yingke Ren 2 , Sheng Cheng 3 , Lun Zhang 1 , Pujun Niu 1 , Mei Lyu 1 , Hongbo Lu 1 , Mingkui Wang 4 , Jun Zhu 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-12-01 , DOI: 10.1039/d2ta07593h Yinyan Xu 1 , Yingke Ren 2 , Sheng Cheng 3 , Lun Zhang 1 , Pujun Niu 1 , Mei Lyu 1 , Hongbo Lu 1 , Mingkui Wang 4 , Jun Zhu 1
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Lead halide perovskite film exhibits excellent optoelectronic properties. The currently most common preparation method usually needs a conductive-annealing process, which inevitably leads to residual strain and defects, hindering the performance of the resulting perovskite solar cells (PSCs). In this work, we develop a residual strain regulation (RSR) strategy in which an appropriate amount of ligand-capped CsPbI3 quantum dot (QD) solution is used as the antisolvent during the preparation process of (CH(NH2)2)0.95Cs0.05PbI3 perovskite films. In this strategy, not only do the lattice-matching CsPbI3 QDs act as heterogeneous nucleation centers, but also the ligands attach to the perovskite film's surface, which significantly regulates the crystallization kinetics and releases the residual strain during the annealing process. The strategy successfully delivers multiple effects: an enlarged grain size, fewer defects, reduced nonradiative recombination and higher charge transfer efficiency. Therefore, the device shows a PCE of 23.32%, higher than that of a control device of 21.61%. First-principles calculations are performed to study the electronic structure of the perovskite films under strained conditions. We believe that this facile approach provides a novel strain engineering strategy for PSC technology.
中文翻译：
基于量子点的高效钙钛矿太阳能电池残余应变调控策略
卤化铅钙钛矿薄膜具有优异的光电性能。目前最常见的制备方法通常需要导电退火工艺，这不可避免地导致残余应变和缺陷，阻碍了所得钙钛矿太阳能电池（PSC）的性能。在这项工作中，我们开发了一种残余应变调节 (RSR) 策略，其中在 (CH(NH 2 ) 2 ) 0.95的制备过程中使用适量的配体封端的 CsPbI 3量子点 (QD) 溶液作为反溶剂Cs 0.05 PbI 3钙钛矿薄膜。在这个策略中，不仅晶格匹配 CsPbI 3QD 作为异质成核中心，但配体也附着在钙钛矿薄膜的表面，这显着调节了结晶动力学并在退火过程中释放了残余应变。该策略成功地产生了多种效果：晶粒尺寸增大、缺陷减少、非辐射复合减少以及电荷转移效率提高。因此，该装置的 PCE 为 23.32%，高于控制装置的 21.61%。进行第一性原理计算以研究钙钛矿薄膜在应变条件下的电子结构。我们相信这种简便的方法为 PSC 技术提供了一种新颖的应变工程策略。
更新日期：2022-12-01
中文翻译：
基于量子点的高效钙钛矿太阳能电池残余应变调控策略
卤化铅钙钛矿薄膜具有优异的光电性能。目前最常见的制备方法通常需要导电退火工艺，这不可避免地导致残余应变和缺陷，阻碍了所得钙钛矿太阳能电池（PSC）的性能。在这项工作中，我们开发了一种残余应变调节 (RSR) 策略，其中在 (CH(NH 2 ) 2 ) 0.95的制备过程中使用适量的配体封端的 CsPbI 3量子点 (QD) 溶液作为反溶剂Cs 0.05 PbI 3钙钛矿薄膜。在这个策略中，不仅晶格匹配 CsPbI 3QD 作为异质成核中心，但配体也附着在钙钛矿薄膜的表面，这显着调节了结晶动力学并在退火过程中释放了残余应变。该策略成功地产生了多种效果：晶粒尺寸增大、缺陷减少、非辐射复合减少以及电荷转移效率提高。因此，该装置的 PCE 为 23.32%，高于控制装置的 21.61%。进行第一性原理计算以研究钙钛矿薄膜在应变条件下的电子结构。我们相信这种简便的方法为 PSC 技术提供了一种新颖的应变工程策略。
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