Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Two-resonance tapping cavity for broadband light confinement in thin film photovoltaic cells
After decades of thin film photovoltaic technology development, many different physical phenomena have been considered and partial success in improving the cell efficiency has been reached when a certain degree of light trapping has been demonstrated. However, light-trapping or confinement has never been shown to be critical to achieve record performing thin film cells.
In this work, we implement a two-resonance tapping cavity (TRTC) to reach an optimal broadband confinement for electromagnetic waves.[1] We demonstrate that the combination of an insulator cavity layer with a metal cavity layer leads to the formation of an optical cavity that can be made to resonate at two non-harmonic frequencies. The increase in energy storage capacity relies in the inharmonicity of the electromagnetic field propagation within the TRTC. We demonstrate that the energy confinement capacity seen is to a large extent independent of the material composition or thickness of the active layer. We experimentally measured and certified record efficiencies (>11%) for a PTB7-Th polymer cell and predicted that when the TRTC is applied to a perovskite cell the EQE would closely match the IQE for a broad frequency range predicting ultimate efficiencies for single junction cells based on perovskites.
[1] Q. Liu, P. Romero-Gomez, P. Mantilla-Perez, S. Colodrero, J. Toudert, J. Martorell, Adv. Energy Mater. 2017, 1700356.
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