Top-down Strategy toward Versatile Graphene Quantum
Dots for Organic/Inorganic Hybrid Solar Cells
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Abstract
Metal oxide nanocrystals have been
pursued for various applications
in photovoltaics as a buffer layer. However, it remains a challenging
task to adjust their energy levels to achieve a better match of the
donor–acceptor system. Herein, we report the fabrication of
graphene quantum dots (GQDs) with bright blue photoluminescence by
a top-down strategy based on laser fragmentation with posthydrothermal
treatment. The GQDs demonstrate appropriate energy level positions
and are used as an intermediate buffer layer between TiO<sub>2</sub> and P3HT to form a cascade energy level architecture. The introduction
of the GQDs into a bulk heterojunction hybrid solar cell has led to
an enhancement of the power conversion efficiency