A fluorene-terminated hole-transporting material for highly efficient and stable perovskite solar cells
A fluorene-terminated hole-transporting material for highly efficient and stable perovskite solar cells
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DOI：
10.1038/s41560-018-0200-6
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发表时间：
2018-08-01
期刊：
影响因子：
56.7
通讯作者：
Seo, Jangwon
中科院分区：
文献类型：
--
作者：
Jeon, Nam Joong;Na, Hyejin;Seo, Jangwon
永久太阳能电池（PSC）如果要商业化，则需要高效率和良好的长期稳定性。为了获得更好的性能，关键是要精细地优化钙钛矿和空穴传输材料之间的能级匹配。在这里，我们合成了一种具有微调能级和高玻璃化转变温度的芴封端的空穴传输材料，以确保高效和热稳定的PSC。我们使用这种材料来制造具有23.2%效率（在反向扫描下）的光伏器件，其中对于小面积（~ 0.094 cm（2））电池的稳态效率为22.85%，对于大面积（~ 1 cm（2））电池的稳态效率为21.7%（在反向扫描下）。我们还实现了22.6%（小面积电池，-0.094 cm（2））和20.9%（大面积，-1 cm（2））的认证效率。所得器件显示出比具有螺-OMeCl 2的器件更好的热稳定性，在60 ℃下热退火后保持其初始性能的几乎95%超过500 h。
Perovskite solar cells (PSCs) require both high efficiency and good long-term stability if they are to be commercialized. It is crucial to finely optimize the energy level matching between the perovskites and hole-transporting materials to achieve better performance. Here, we synthesize a fluorene-terminated hole-transporting material with a fine-tuned energy level and a high glass transition temperature to ensure highly efficient and thermally stable PSCs. We use this material to fabricate photovoltaic devices with 23.2% efficiency (under reverse scanning) with a steady-state efficiency of 22.85% for small-area (-0.094 cm(2)) cells and 21.7% efficiency (under reverse scanning) for large-area (-1 cm(2)) cells. We also achieve certified efficiencies of 22.6% (small-area cells, -0.094 cm(2)) and 20.9% (large-area, -1 cm(2)). The resultant device shows better thermal stability than the device with spiro-OMeTAD, maintaining almost 95% of its initial performance for more than 500 h after thermal annealing at 60 degrees C.