Enhanced physical properties of pulsed laser deposited NiO films via annealing and lithium doping for improving perovskite solar cell efficiency
Enhanced physical properties of pulsed laser deposited NiO films via annealing and lithium doping for improving perovskite solar cell efficiency
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通过退火和锂掺杂增强脉冲激光沉积 NiO 薄膜的物理性能，以提高钙钛矿太阳能电池效率
DOI：
10.1039/c7tc01224a
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发表时间：
2017-07-28
影响因子：
6.4
通讯作者：
Cao, Bingqiang
中科院分区：
文献类型：
--
作者：
Qiu, Zhiwen;Gong, Haibo;Cao, Bingqiang
脉冲激光沉积（PLD）是一种强大的薄膜生长技术，其中原位掺杂和热后退火是调整沉积薄膜晶体和物理性质的最有效方法。研究表明，PLD可以很好地控制NiO薄膜的结晶度、透明度和电学性能，这决定了以NiO薄膜作为空穴传输层（HTLs）的CH3NH3PbI3−xclx基钙钛矿太阳能电池的光伏性能。经过退火处理后，NiO薄膜的面内晶体取向增强，透光率高，表面形貌均匀，钙钛矿太阳能电池的功率转换效率（PCE）由5.38%提高到12.59%。此外，通过在烧蚀靶中掺杂锂（Li）， PLD可以制备出电导率显著增强的掺杂NiO:Li薄膜，进一步将钙钛矿电池PCE从12.59%提高到15.51%。这些结果突出了优化输运层性能对高性能倒钙钛矿平面太阳能电池的重要性。
Pulsed laser deposition (PLD) is a powerful growth technique for thin films, where in situ doping and post-thermal annealing are the most effective ways to tune the crystalline and physical properties of the deposited films. This paper demonstrates that the crystallinity, transparency, and electrical properties of NiO films are well controlled by PLD, which determines the photovoltaic performance of CH3NH3PbI3−xClx-based perovskite solar cells with NiO films as the hole transport layers (HTLs). After post-annealing, the NiO films exhibit enhanced in-plane crystal orientation, high transmittance, and uniform surface morphology, and, accordingly, the power conversion efficiency (PCE) of the perovskite solar cell improves from 5.38% to 12.59%. Moreover, by doping the ablated target with lithium (Li), PLD can produce doped NiO:Li films with significantly enhanced electrical conductivity, which further improves the perovskite cell PCE from 12.59% to 15.51%. These results highlight the importance of optimizing the transporting layer properties toward high-performance inverted perovskite planar solar cells.