Original title: Overcoming Transport Layer Bottlenecks to Quantify Ionic Parameters from Transient Ion Current Measurements of Perovskite Solar Cells
Shudi Jiao, Miguel Torre Cachafeiro, Huagui Lai, Fuxiang Ji +6 · September 2026
Perovskite solar cells contain mobile ions, which are charged atoms that move inside the material. Scientists use electrical tests called transient ion current measurements to count these ions. Simulations show this measurement should stop increasing once ions cancel out the internal electric field. Yet, real experiments often measure ion counts orders of magnitude higher than expected. The researchers investigated this puzzle. They discovered that transport layers—the extra materials on either side of the perovskite—act as a bottleneck. These layers have a property called capacitance, which limits how much electrical charge can gather at the boundaries. Because of this, the test measures the transport layers instead of the perovskite itself. To fix this problem, the team showed that testing different layer thicknesses and extrapolating to zero thickness reveals the true ionic conductivity, density, and mobility. Slow-releasing trapped charges and ions entering transport layers can also distort measurements.
Imagine trying to measure how much water is in a large swimming pool by only looking at how much water flows through a narrow garden hose connected to it. The hose's size limits how much water you can see, making it seem like there's less water in the pool than there actually is. In this paper, the electrical layers of the solar cell are like that narrow hose, limiting what the ion current measurements can reveal about the main solar material, which is like the pool.
Perovskite solar cells are a promising renewable energy technology. Understanding their ion behavior is crucial for improving their efficiency and stability, but current measurement methods can give incorrect results.
The abstract does not explicitly state limitations of the proposed correction methods or the experimental findings beyond the scope of interpreting TIC measurements and quantifying ionic properties in PSCs.
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Overcoming Transport Layer Bottlenecks to Quantify Ionic Parameters from Transient Ion Current Measurements of Perovskite Solar Cells — Shudi Jiao, Miguel Torre Cachafeiro, Huagui Lai et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.