Efficient chromium ion passivated CsPbCl3:Mn perovskite quantum dots for photon energy conversion in perovskite solar cells
Efficient chromium ion passivated CsPbCl3:Mn perovskite quantum dots for photon energy conversion in perovskite solar cells
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DOI：
10.1039/d0tc03115a
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发表时间：
2020-09
影响因子：
6.4
通讯作者：
Donglei Zhou;Li Tao;Zhongzheng Yu;J. Jiao;Wen Xu
中科院分区：
文献类型：
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作者：
Donglei Zhou;Li Tao;Zhongzheng Yu;J. Jiao;Wen Xu
通过光子能量转换扩大光谱响应是进一步提高钙钛矿太阳能电池（PSC）功率转换效率（PCE）的有效方法。在这项工作中，合成了Cr3+钝化CsPbCl3:Mn2+钙钛矿量子点（PQD），该量子点具有对紫外（UV）光的高吸收性、改善的光致发光（PL）和大斯托克斯位移以及提高的稳定性，是PSC的理想光子能量转换器。当 Cr3+ 含量为 7.5 mol% 时，CsPbCl3:Cr3+,Mn2+ PQD 的最佳光致发光量子产率（PLQY）达到 97%。 PLQY 的增强可归因于 Cr3+ 的钝化效应以及从钙钛矿到 Mn2+ 的能量转移速率的增加。将高效转换器组装在PSC的表面上，PCE相对提高了7.40%，从20.81%增加到22.35%。这项工作提供了一种调节量子点材料PL特性的方法，以及进一步提高性能甚至打破太阳能电池Shockley-Queisser极限的通用策略。
Expanding the spectrum response through photon energy conversion is an effective way to further increase the power conversion efficiency (PCE) of perovskite solar cells (PSCs). In this work, the Cr3+ passivated CsPbCl3:Mn2+ perovskite quantum dots (PQDs) were synthesized, which display high absorption of ultraviolet (UV) light, improved photoluminescence (PL) with a large Stokes shift, and improved stability, which is the ideal photon energy converter for PSCs. The optimal photoluminescence quantum yields (PLQYs) of CsPbCl3:Cr3+,Mn2+ PQDs reach 97% with 7.5 mol% of Cr3+. The enhancement of PLQYs can be attributed to the passivation effect of Cr3+ and the increased energy transfer rate from perovskite to Mn2+. The efficient converter was assembled on the surface of the PSCs, which display 7.40% relative increase of PCE from 20.81% to 22.35%. This work provides a method to tune the PL properties of quantum dot materials and a universal strategy to further increase the performance and even break the Shockley–Queisser limit of solar cells.