Impactof the Hole Transport Layer on the Charge Extractionof Ruddlesden–Popper Perovskite Solar Cells
2020
Recent
works demonstrate that polyelectrolytes as a hole transport
layer (HTL) offers superior performance in Ruddlesden–Popper
perovskite solar cells (RPPSCs) compared to poly(3,4-ethylenedioxythiophene)
polystyrene sulfonate (PEDOT:PSS). The factors contributing to such
improvement need to be systematically investigated. To achieve this,
we have systematically investigated how the two HTLs affect the morphology,
crystallinity, and orientation of the Ruddlesden–Popper perovskite
(RPP) films as well as the charge extraction of the RPPSCs. PEDOT:PSS
as a HTL leads to RPP films of low crystallinity and with a number
of large pinholes. These factors lead to poor charge carrier extraction
and significant charge recombination in the RPPSCs. Conversely, a
PCP-Na HTL gives rise to highly crystalline and pinhole-free RPPSC
films. Moreover, a PCP-Na HTL provides a better energy alignment at
the perovskite/HTL interface because of its higher work function compared
to PEDOT:PSS. Consequently, devices using PCP-Na as HTLs are more
efficient in extracting charge carriers.
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