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Issue 12, 2016
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Two-terminal DSSC/silicon tandem solar cells exceeding 18% efficiency

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Tandem architectures using organic/inorganic hybrid semiconductors are a promising strategy to overcome the Shockley–Queisser limit of single-junction (SJ) solar cells as already demonstrated in III–V compound semiconductors. Here, we present a highly-efficient dye-sensitized solar cell (DSSC)/silicon (Si) monolithic tandem cell by utilizing PEDOT:FTS as an interfacial catalytic layer, which has higher transparency and lower charge-transfer resistance compared to conventional Pt. In addition, the amount of dye adsorbed on the surface of TiO2 nanoparticles is fine-tuned for precise current matching between the two sub-cells. Based on these rational approaches, the DSSC/Si tandem cell exhibited a much higher power-conversion efficiency (PCE) of 17.2% compared to the stand-alone SJ devices of DSSCs (−11.4%) or Si (−12.3%) cells. The PCE of the best tandem cell is 18.1%. To the best of our knowledge, our tandem cell has a record-high PCE among all tandem cells involving DSSCs and also the highest improvement of PCE among all tandem cells based on dissimilar photovoltaic materials. The 2-terminal DSSC/Si tandem solar cells exhibit a high Voc value of 1.36 V. The DSSC/Si tandem solar cells are externally connected to a Pt electro-catalyst for use as water splitting cells. Solar-to-hydrogen conversion was accomplished at 0.65 V vs. Pt bias. We expect that a tandem architecture based on organic–inorganic hybrid materials can provide a promising way to realize low-cost and high-efficiency photovoltaic devices for solar cells and hydrogen generation.

Graphical abstract: Two-terminal DSSC/silicon tandem solar cells exceeding 18% efficiency

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Publication details

The article was received on 08 Aug 2016, accepted on 21 Oct 2016 and first published on 02 Nov 2016

Article type: Communication
DOI: 10.1039/C6EE02296K
Citation: Energy Environ. Sci., 2016,9, 3657-3665

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    Two-terminal DSSC/silicon tandem solar cells exceeding 18% efficiency

    J. Kwon, M. J. Im, C. U. Kim, S. H. Won, S. B. Kang, S. H. Kang, I. T. Choi, H. K. Kim, I. H. Kim, J. H. Park and K. J. Choi, Energy Environ. Sci., 2016, 9, 3657
    DOI: 10.1039/C6EE02296K

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