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Size effects of Graphene Quantum Dots Modified-blocking TiO2 layer for Efficient Planar Perovskite Solar Cells

Abstract

Research on the addition of suitable materials into perovskite solar cells (PSCs) for improved performance is as important as the fabrication of efficient perovskite films themselves. Attempt to enhance the performance of planar type perovskite solar cells was performed by introducing graphene quantum dots (GQDs) onto blocking TiO2 layer via O2 plasma treatment. Furthermore, the bandgap of the GQDs was tuned through their size control and the effects of GQD size on cell performance were explored. The GQDs can induce fast electron extraction and the formation of the improved perovskite quality. The devices with proper sized-GQDs showed average 10% enhancement compared with those of cells without GQDs and achieved 19.11 % as the best power conversion efficiency (PCE). Furthermore, GQDs contributed to the reduction in the extent of current voltage hysteresis, which was attributed to the planar structure.

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Publication details

The article was received on 14 Mar 2017, accepted on 13 Jul 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA02242E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Size effects of Graphene Quantum Dots Modified-blocking TiO2 layer for Efficient Planar Perovskite Solar Cells

    J. Ryu, J. W. Lee, H. Yu, J. Yun, K. Lee, J. Lee, D. Hwang, J. Kang, S. K. Kim and J. Jang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02242E

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