Reduced bilateral recombination by functional molecular interface engineering for efficient inverted perovskite solar cells
Reduced bilateral recombination by functional molecular interface engineering for efficient inverted perovskite solar cells
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DOI：
10.1016/j.nanoen.2020.105249
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发表时间：
2020-12-01
期刊：
影响因子：
17.6
通讯作者：
Zhang, Wei
中科院分区：
文献类型：
--
作者：
Li, Bowei;Xiang, Yuren;Zhang, Wei
钙钛矿和电荷传输层之间界面介导的复合损失是限制器件性能的主要原因之一，特别是钙钛矿太阳能电池（PSC）的开路电压（VOC）。这里，采用功能分子界面工程（FMIE）来延缓界面复合损失。 FMIE 是一种简便的溶液处理方法，在钙钛矿吸收层的两个触点上引入功能分子、芴基共轭聚电解质（CPE）和有机卤化物盐（OHS）。通过 FMIE，具有倒置平面异质结结构的冠军 PSC 显示出 1.18 V 的极高 V-OC，同时保持 0.83 的填充因子 (FF)，这两者都使功率转换效率 (PCE) 提高到 21.33%（稳定 PCE 为 21.01%）。除了在倒置 PSC 中实现最高 PCE 之一之外，结果还凸显了这两种分子在提高器件性能方面的协同效应。因此，该研究为制造高效倒置 PSC 提供了一条简单的途径。
Interface-mediated recombination losses between perovskite and charge transport layers are one of the main reasons that limit the device performance, in particular for the open-circuit voltage (VOC) of perovskite solar cells (PSCs). Here, functional molecular interface engineering (FMIE) is employed to retard the interfacial recombination losses. The FMIE is a facile solution-processed means that introducing functional molecules, the fluorenebased conjugated polyelectrolyte (CPE) and organic halide salt (OHS) on both contacts of the perovskite absorber layer. Through the FMIE, the champion PSCs with an inverted planar heterojunction structure show a remarkable high V-OC of 1.18 V whilst maintaining a fill factor (FF) of 0.83, both of which result in improved power conversion efficiencies (PCEs) of 21.33% (with stabilized PCEs of 21.01%). In addition to achieving one of the highest PCEs in the inverted PSCs, the results also highlight the synergistic effect of these two molecules in improving device performance. Therefore, the study provides a straightforward avenue to fabricate highly efficient inverted PSCs.