Low-Temperature Processed Electron Collection Layers of Graphene/TiO2 Nanocomposites in Thin Film Perovskite Solar Cells
Low-Temperature Processed Electron Collection Layers of Graphene/TiO2 Nanocomposites in Thin Film Perovskite Solar Cells
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DOI：
10.1021/nl403997a
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发表时间：
2014-02-01
期刊：
影响因子：
10.8
通讯作者：
Nicholas, Robin J.
中科院分区：
文献类型：
--
作者：
Wang, Jacob Tse-Wei;Ball, James M.;Nicholas, Robin J.
在可溶液加工的钙钛矿基太阳能电池中，使用一种需要在500摄氏度下烧结的电子收集层实现了最高效率。这对于低成本生产、在塑料基底上的应用以及多结器件结构是不利的。在此我们报道一种低成本、基于溶液的沉积工艺，该工艺利用石墨烯和二氧化钛纳米颗粒的纳米复合材料作为介观超结构钙钛矿太阳能电池中的电子收集层。石墨烯纳米薄片在纳米复合材料中提供了优异的电荷收集性能，使得整个器件能够在不高于150摄氏度的温度下制造。这些太阳能电池显示出显著的光伏性能，功率转换效率高达15.6%。这项工作表明石墨烯/金属氧化物纳米复合材料有潜力对低成本太阳能电池的发展做出重大贡献。
The highest efficiencies in solution-processable perovskite-based solar cells have been achieved using an electron collection layer that requires sintering at 500 degrees C. This is unfavorable for low-cost production, applications on plastic substrates, and multijunction device architectures. Here we report a low-cost, solution-based deposition procedure utilizing nanocomposites of graphene and TiO2 nanoparticles as the electron collection layers in meso-superstructured perovskite solar cells. The graphene nanoflakes provide superior charge-collection in the nanocomposites, enabling the entire device to be fabricated at temperatures no higher than 150 degrees C. These solar cells show remarkable photovoltaic performance with a power conversion efficiency up to 15.6%. This work demonstrates that graphene/metal oxide nanocomposites have the potential to contribute significantly toward the development of low-cost solar cells.