andem colloidal quantum dot solar cells employing a graded recombination layer
Wang, X., Koleilat, G. I., Tang, J., Liu, H., Kramer, I. J., Debnath, R., et al.
2011 Nature Photonics, June 26
Wang, X., Koleilat, G. I., Tang, J., Liu, H., Kramer, I. J., Debnath, R., et al., (2011), "andem colloidal quantum dot solar cells employing a graded recombination layer", Nature Photonics, June 26.
Abstract:
Xihua Wang, Ghada I. Koleilat, Jiang Tang, Huan Liu, Illan J. Kramer, Ratan Debnath, Lukasz Brzozowski, D. Aaron R. Barkhouse, Larissa Levina, Sjoerd Hoogland & Edward H. Sargent
doi:10.1038/nphoton.2011.123
Tuning of the electronic bandgap in colloidal quantum dots (CQDs) by changing their size enables the spectral response of CQD-based photodetectors1, 2, 3, 4, 5 and photovoltaic6, 7, 8, 9, 10, 11, 12 devices to be tailored. Multi-junction solar cells made from a combination of CQDs of differing sizes and thus bandgaps are a promising means by which to increase the energy harvested from the Sun's broad spectrum. Here, we report the first CQD tandem solar cells using the size-effect tuning of a single CQD material, PbS. We use a graded recombination layer to provide a progression of work functions from the hole-accepting electrode in the bottom cell to the electron-accepting electrode in the top cell, allowing matched electron and hole currents to meet and recombine. Our tandem solar cell has an open-circuit voltage of 1.06 V, equal to the sum of the two constituent single-junction devices, and a solar power conversion efficiency of up to 4.2%.
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