Publications
Learn more about the techniques and characterization in the selected literature below.
In this work, we proposed the method to quantify efficiency loss due to mobile ions via “fast-hysteresis” measurements by preventing the perturbation of mobile ions out of their equilibrium position at fast scan speeds (1000 V s ). The “ion-free” PCE is between 1% and 3% higher than the steady-state PCE, demonstrating the importance of ion-induced losses, even in cells with low levels of hysteresis at typical scan speeds (100 mV s ). The hysteresis over many orders of magnitude in scan speed provides important information on the effective ion diffusion constant from the peak hysteresis position. The proposed method to quantify PCE losses due to field screening induced by mobile ions clarifies several important experimental observations and opens up a large range of future experiments.
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Here we investigated the origin of the current losses, using a combination of voltage dependent photoluminescence (PL) timeseries and various charge extraction measurements. We demonstrate that the Pn/Sn-perovskite devices suffer from a reduction in the charge extraction efficiency within the first few seconds of operation, which leads to a loss in current and lower maximum power output.
You can also check out the presentation of this work by Jarla Thiesbrummel following this
In this paper we established a simulation model that describes efficient p-i-n type perovskite solar cells and a range of different experiments. We then studied important device and material parameters and we find that an efficiency regime of 30% can be unlocked by optimizing the built-in potential across the perovskite layer by using either highly doped (10 cm ), thick transport layers (TLs) or ultrathin undoped TLs, e.g. self-assembled monolayers.
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