Polyelectrolyte-assisted uniform electron transporting layer on texture substrate for perovskite solar cells

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Abstract Organic–inorganic halide perovskite solar cells using textured transparent conductive films exhibit high efficiencies with improved short-circuit current density. However, uniform electron transport layer (ETL) deposition on textures by solution process is challenging. In this study, uniform ETL were formed by sequentially spin- coating polyelectrolyte with positively and negatively charged segments and negative SnO2 colloid solution and electrostatically enhancing the SnO2 coverage. The stabilized power output (SPO) was improved from 12.9% to 18.6% by incorporating this polyelectrolyte/SnO2 bilayer.