As solar cell efficiency improves, so does the cell's radiative efficiency. In high‐performance tandem stacks, each individual cell emits significant luminescence during operation, making radiative coupling between these cells an important factor to consider in cell design, measurement and performance prediction. Past modelling includes the electroluminescent coupling component only, although photoluminescent coupling is likely to be important for cells operating near or below their maximum power point voltage or when junction defect recombination is dominant. In this work, we first propose an extension of earlier models to allow this non‐negligible coupling component to be included, which is validated by measurement of the closely related external emission. Then, we establish an equivalent circuit and uniquely use intuitive circuit concepts to conduct a comprehensive analysis clarifying the roles of parasitic circuit elements and external loads in the complex radiative interactions between cells. The circuit analysis also reveals some undiscovered issues to be addressed in eliminating coupling effects from measured cell spectral responses. Copyright © 2016 John Wiley & Sons, Ltd. We extend earlier models focusing on electroluminescent coupling through incorporation of an extra photoluminescent component, which is validated by measurement of the closely related external emission. A unique circuit analysis not only clarifies the roles of parasitic circuit elements and external loads in more complex radiative interactions between cells, but also reveals undiscovered issues to be addressed in the critical step of external quantum efficiency corrections.
Photoluminescent and electroluminescent couplings in monolithic tandem solar cells
Progress in photovoltaics ; 24 , 12
2016
Aufsatz (Zeitschrift)
Englisch
BKL: | 53.36 Energiedirektumwandler, elektrische Energiespeicher |
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