Novel NiO Nanoforest Architecture for Efficient Inverted Mesoporous Perovskite Solar Cells.
ACS applied materials & interfaces(2019)
摘要
Inverted perovskite solar cells (PSCs) demonstrates attractive features in developing air-stable photovoltaic device, by employing inorganic hole transport layers (HTLs). However, their power conversion efficiencies (PCEs) are still inferior to that of mesoporous n-i-p devices, mainly attributed to the undesirable hole extraction and interfacial recombination loss. Here, we design a novel one-dimensional NiO nanotubes (NTs) nanoforest as efficient mesoporous HTLs. Such NiO NTs mesoporous structure provides the highly conductive pathway for rapid hole extraction, and depresses interfacial recombination loss. Furthermore, excellent light capturing could be achieved by optimizing length and branch growth of NiO NTs nanoforest, which mimics the evolution of natural forest. Therefore, this inverted mesoporous PSCs yields an optimal efficiency of 18.77%, which is still prominent in state-of-the-art NiO-based devices. Alternatively, the mesoporous device exhibits greatly improved long-term stability. This work provides a new design perspective for developing high-performance inverted PSCs.
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关键词
inverted perovskite solar cells,NiO,nanotube nanoforest,mesoporous structure,hole transporting layer
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