4‑Terminal
Tandem Photovoltaic Cell Using
Two Layers of PTB7:PC<sub>71</sub>BM for Optimal Light Absorption
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Abstract
A 4-terminal architecture is proposed
in which two thin active layers (<100 nm) of PTB7:PC<sub>71</sub>BM are deposited on a two-sided ITO covered glass substrate. By modeling
the electric field distribution inside the multilayer structure and
applying an inverse solving problem procedure, we designed an optimal
device architecture tailored to extract the highest photocurrent possible.
By adopting such a 4-terminal configuration, we numerically demonstrated
that even when the two subcells use identical absorber materials,
the performance of the 4-terminal device may overcome the performance
of the best equivalent single-junction device. In an experimental
implementation of such a 4-terminal device, we demonstrate the viability
of the approach and find a very good match with the trend of the numerical
predictions