Quantifying Charge Carrier Recombination Losses in MAPbI₃/C60 and MAPbI₃/Spiro-OMeTAD with and without Bias Illumination.

ABSTRACT: To increase the open-circuit voltage in perovskite-based solar cells, recombination processes at the interface with transport layers (TLs) should be identified and reduced. We investigated the charge carrier dynamics in bilayers of methylammonium lead iodide (MAPbI₃) with C60 or Spiro-OMeTAD using time-resolved microwave conductance (TRMC) measurements with and without bias illumination (BI). By modeling the results, we quantified recombination losses in bare MAPbI₃ and extraction into the TLs. Only under BI did we find that the density of deep traps increases in bare MAPbI₃, substantially enhancing trap-mediated losses. This reversible process is prevented in a bilayer with C60 but not with Spiro-OMeTAD. While under BI extraction rates reduce significantly

SUBMITTER: Caselli VM 

PROVIDER: S-EPMC9393883 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature