Journal
NANO LETTERS
Volume 14, Issue 2, Pages 724-730Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403997a
Keywords
Graphene; TiO2; perovskite; hybrid photovoltaics; nanocomposites
Categories
Funding
- EPSRC, UK
- Swire Educational Trust
- European Union Seventh Framework Programme under the SANS project [246124]
- European Union Seventh Framework Programme under the DESTINY project [316494]
- EPSRC APEX project
- Generalitat Valenciana [PROMETEO/2009/058]
- EPSRC [EP/H040218/2, EP/G049653/1, EP/F039751/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H040218/2, EP/F039751/1, EP/G049653/1] Funding Source: researchfish
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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.
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