Publication date: 14th September 2023
Abstract
Achieving high efficiencies in halide perovskite solar cells with thicknesses > 1 µm is necessary for developing perovskite-Si tandem cells based on small pyramidal structures. To achieve this goal, not only has the perovskite layer quality to be optimized but the properties of the charge transport layers must also be tuned to reduce charge-collection losses. The transport layers provide a non-ohmic resistance that modulates the Fermi-level splitting inside the perovskite absorber, which can lead to losses in the fill factor, even at infinite charge-carrier mobility in the absorber layer. A strategy to improve charge collection and thereby fill factors in thick inverted perovskite solar cells is to use bilayers of hole-transport layers. In the present study, the combination of PTAA with self-assembled monolayers provided the best photovoltaic performance in single-junction devices.
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