Multifunctional Atomic Force Probes for Mn2+ Doped Perovskite Solar Cells
Multifunctional Atomic Force Probes for Mn2+ Doped Perovskite Solar Cells
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用于Mn2+掺杂钙钛矿太阳能电池的多功能原子力探针
DOI：
10.1016/j.jpowsour.2019.04.009
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发表时间：
2019
影响因子：
9.2
通讯作者：
Zhubing He
中科院分区：
文献类型：
--
作者：
Yinghui Wu;Wei Chen;Zunyuan Wan;Aleks;ra B. Djurišić;Xiyuan Feng;Liyu Liu;Guo Chen;Ruchuan Liu;Zhubing He
在有机-无机钙钛矿半导体中掺杂是调整其光电性能的有效方法。在这项工作中，锰掺杂的钙钛矿薄膜具有不同的Mn/Pb的比例从0%到2%进行了系统的研究。与不含Mn的器件相比，掺杂0.2% Mn的器件的器件性能得到改善。然而，掺杂浓度的进一步增加引起性能下降。几个特性（特别是不同的扫描探针显微镜特性）表明，掺杂剂浓度的增加导致结晶度降低和膜形态的变化，并导致光伏性能的恶化，更高的掺杂剂浓度。在性能最好的样品（0.2%），在价带水平和带隙的位移被发现这是负责增加开路电压，而增加的晶界和较低的表面电荷密度负责一个小的减少短路电流。因此，多功能扫描探针显微镜方法，结合不同的薄膜表征技术，为我们提供了有效的工具来研究掺杂对钙钛矿材料和相应器件性能的影响。
Doping in organic–inorganic perovskite semiconductors is an effective method to tailor their optoelectronic properties. In this work, manganese-doped perovskite films with different Mn/Pb ratios ranging from 0% to 2% were systematically studied. The device performance of 0.2% Mn-doped devices was improved compared to that of a device without Mn. However, a further increase of the doping concentration induced a decrease in performance. Several characteristics (especially different scanning probe microscopy characteristics) reveal that an increased dopant concentration results in reduced crystallinity and a change in the film morphology and causes a deterioration in photovoltaic performance for higher dopant concentrations. In the best-performing samples (0.2%), a shift in the valence band level and band gap are found which are responsible for the increased open circuit voltage, while increased grain boundaries and lower surface charge density are responsible for a small reduction in the short circuit current. Thus, multifunctional scanning probe microscopy approaches, combined with different film characterization techniques, offer us effective tools to investigate the impact of doping in the perovskite materials and the corresponding device performance.