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Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells

Abstract

The relatively large voltage loss (Vloss) in excitonic type solar cells severely limits their power conversion efficiencies (PCEs). Here, we report a comprehensive control of Vloss through an efficacious engineering on sensitizer and redox mediator, making a breakthrough in the PCE of dye-sensitized solar cells (DSSCs). The targeted down-regulation of Vloss is successfully realized by three valid channels: i) reducing driving force of electron injection through dye molecular engineering, ii) decreasing the dye regeneration overpotential through a redox mediator engineering, and iii) suppressing the interfacial electron recombination. Significantly, the “trade-off” effect between dye optical band gap and open-circuit voltage (VOC) is minimized to a great extent, achieving a distinct enhancement in photovoltaic performance (PCE > 11.5% with VOC up to 1.1 V) for liquid junction cells. The solidification of the best-performing device leads to a PCE of 11.7%, which is so far the highest efficiency for solid-state DSSCs. Our work inspires the further development in highly efficient excitonic solar cells by comprehensive control of Vloss.

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Publication details

The article was received on 04 Mar 2018, accepted on 16 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8EE00661J
Citation: Energy Environ. Sci., 2018, Accepted Manuscript
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    Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells

    W. Zhang, Y. Wu, H. W. Bahng, Y. Cao, C. Yi, Y. Saygili, J. Luo, Y. Liu, L. Kavan, J. E. Moser, A. Hagfeldt, H. Tian, S. M. Zakeeruddin, W. Zhu and M. Grätzel, Energy Environ. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8EE00661J

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