Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
The efficiency of mixed-halide perovskite solar cells is negatively affected by sub-bandgap electronic defect states. Understanding the spatial and energetic location of these defects is crucial to developing methods to mitigate nonradiative losses.
Most sensitive characterization techniques used to study defect response and behavior in perovskite solar cells require complete device stacks. This makes it difficult to distinguish between the contributions of the perovskite layer or other adjacent layers. Studying how the intrinsic perovskite defect response alters when passivating or charge-transport layers are deposited atop without the fabrication of a complete solar cell device allows for a more direct analysis of the defect response.
Here, we employ sensitive photoconductivity (PC) spectroscopy to disentangle the effect of charge-transport layers or surface passivation treatments on the sub-bandgap defect response in metal-halide perovskite thin-films without fabricating a complete functioning solar cell. We find an intrinsic sub-bandgap defect response for neat perovskite films which increases upon subsequent deposition of a fullerene layer. Surface passivation using choline chloride shows a decrease in intrinsic perovskite defect response that remains unaffected after additional fullerene deposition. These experiments show the intrinsic perovskite defect response can directly be changed by charge transport or passivation layers.
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