<i>In Situ</i> Interface Engineering for Highly Efficient Electron-Transport-Layer-Free Perovskite Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 32634316.
- Also identified by DOI 10.1021/acs.nanolett.0c01689.
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Abstract
Electron-transport-layer free perovskite solar cells (ETL-free PSCs) have attracted great attention due to their low cost and simple manufacturing process. However, an additional interface layer has to be introduced, and the currently achieved efficiency remains far from full-structure PSCs. Here, we report an <i>in situ</i> interface engineering strategy by the methylammonium acetate (MAAc) ionic liquid perovskite precursor. We found that a dipole layer was <i>in situ</i> constructed through the physical adsorption of the residual MAAc polar molecules on the indium tin oxide electrode, which is significantly different from the treatment by the interface layer in previous reports. This allows a decrease of the effective work function and enables <i>in situ</i> band bending in the perovskite semiconductor. The <i>in situ</i> band bending facilitates charge collection and hinders interfacial charge recombination, leading to ETL-free PSCs with a maximum power conversion efficiency of 21.08%, which is the highest report to date.