MgO Nanoparticle Modified Anode for Highly Efficient SnO(2)-Based Planar Perovskite Solar Cells.
MgO Nanoparticle Modified Anode for Highly Efficient SnO(2)-Based Planar Perovskite Solar Cells.
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用于高效 SnO2 基平面钙钛矿太阳能电池的 MgO 纳米粒子修饰阳极
DOI：
10.1002/advs.201700031
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发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
Fang G
中科院分区：
文献类型：
--
作者：
Ma J;Yang G;Qin M;Zheng X;Lei H;Chen C;Chen Z;Guo Y;Han H;Zhao X;Fang G
降低能量损失和抑制界面载流子复合是提高钙钛矿太阳能电池性能的关键。然而，很少有人知道在阳极和SnO 2电子传输层（ETL）的界面处的复合机制。在这项工作中，一个超宽带隙介电MgO纳米层之间的SnO 2：F（FTO）电极和平面PSC的SnO 2 ETL，实现增强的电子传输和空穴阻挡性能。使用该电极改性剂后，功率转换效率为18.23%，比不使用MgO改性剂的功率转换效率提高了11%。这些改进归因于MgO改性的FTO/SnO 2与FTO/SnO 2相比具有更好的性质，例如更光滑的表面、由于MgO钝化而导致的更少的FTO表面缺陷以及抑制的电子-空穴复合。同时，具有较低价带底能级的MgO纳米层对空穴的阻挡作用更好。当用Sn掺杂的In 2 O3（ITO）代替FTO时，表现出18.82%的更高的功率转换效率。结果，具有MgO空穴阻挡层的器件表现出所有J-V参数的显著改善。本工作为通过透明导电电极表面改性来提高SnO 2 ETL基PSC的性能提供了一个新的方向。
Reducing the energy loss and retarding the carrier recombination at the interface are crucial to improve the performance of the perovskite solar cell (PSCs). However, little is known about the recombination mechanism at the interface of anode and SnO2 electron transfer layer (ETL). In this work, an ultrathin wide bandgap dielectric MgO nanolayer is incorporated between SnO2:F (FTO) electrode and SnO2 ETL of planar PSCs, realizing enhanced electron transporting and hole blocking properties. With the use of this electrode modifier, a power conversion efficiency of 18.23% is demonstrated, an 11% increment compared with that without MgO modifier. These improvements are attributed to the better properties of MgO‐modified FTO/SnO2 as compared to FTO/SnO2, such as smoother surface, less FTO surface defects due to MgO passivation, and suppressed electron–hole recombinations. Also, MgO nanolayer with lower valance band minimum level played a better role in hole blocking. When FTO is replaced with Sn‐doped In2O3 (ITO), a higher power conversion efficiency of 18.82% is demonstrated. As a result, the device with the MgO hole‐blocking layer exhibits a remarkable improvement of all J–V parameters. This work presents a new direction to improve the performance of the PSCs based on SnO2 ETL by transparent conductive electrode surface modification.
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