Surface Ligand Management for Stable FAPbI3 Perovskite Quantum Dot Solar Cells
Surface Ligand Management for Stable FAPbI3 Perovskite Quantum Dot Solar Cells
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DOI：
10.1016/j.joule.2018.07.018
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发表时间：
2018-09-19
期刊：
影响因子：
39.8
通讯作者：
Yang, Yang
中科院分区：
文献类型：
--
作者：
Xue, Jingjing;Lee, Jin-Wook;Yang, Yang
与传统的胶体量子点 (CQD) 相比，钙钛矿 CQD 上的绝缘配体的管理具有挑战性，因为它们的离子键非常容易受到极性溶剂的影响。因此，只有少数采用相对坚固的无机钙钛矿的钙钛矿 CQD 太阳能电池的例子，其光电特性对于光伏器件来说并不理想。在这里，我们报道了基于甲脒三碘化铅（FAPbI（3））CQD的高效稳定的CQD太阳能电池，该CQD通过合理的表面调节实现。为后合成过程定制反溶剂的极性，可以有效去除 FAPbI(3) CQD 上的绝缘配体，同时保留钙钛矿核。由于点间电耦合增强，功率转换效率达到 8.38%。此外，基于 FAPbI(3) CQD 的器件表现出优于块状 FAPbI(3) 器件的稳定性。热力学和晶体学分析表明，表面能和晶格收缩的贡献增强有助于其优异的稳定性。
In contrast to conventional colloidal quantum dots (CQDs), management of insulating ligands on perovskite CQDs is challenging because their ionic bonds are highly vulnerable to polar solvents. Consequently, there have been only a few examples of perovskite CQD solar cells incorporating relatively robust inorganic perovskite of which optoelectronic properties are not ideal for photovoltaic devices. Here, we report efficient and stable CQD solar cells based on formamidinium lead triiodide (FAPbI(3)) CQDs realized by rational surface regulation. Tailoring polarity of antisolvents for the post-synthetic process enabled effective removal of the insulating ligands on FAPbI(3) CQDs while preserving perovskite cores. Owing to the enhanced inter-dot electrical coupling, a power-conversion efficiency of 8.38% was demonstrated. Furthermore, the FAPbI(3) CQDs-based devices showed superior stability over those of bulk FAPbI(3) devices. Thermodynamic and crystallographic analyses revealed that enhanced contribution of the surface energy and lattice contraction contribute to their superior stability.