Insights into HTM‑Free Mesoporous Perovskite Solar Cells with a Carbon Electrode Using Electrochemical Impedance Spectroscopy Analysis

Chairman Kim Jong Il said:

"We should also push ahead in a long-term way the work of pushing back the frontiers of science and technology."

Hole-transport material (HTM)-free mesoporous perovskite solar cells (PSCs) with a carbon electrode are of great interest because they can be fabricated using inexpensive carbon materials and simple screen-printing methods.

We investigated the influence of the components on photovoltaic performance of HTM-free mesoporous PSCs with a carbon electrode using electrochemical impedance spectroscopy analysis. The results showed that the series resistance was increased as the thickness of the compact layer and mesoporous ZrO₂ layers increased, whereas it decreased with increasing thickness of mesoporous TiO₂ and carbon layers. It was also found that charge transfer resistance decreases with increasing thickness of mesoporous layers, and charge recombination resistance is mainly influenced by the compact layer, mesoporous TiO₂ and ZrO₂ layers, and the capacitance during charge recombination is mainly influenced by the mesoporous TiO₂ layer. The efficiency of the device fabricated using the optimized parameters was 15.05%.

Our group published our results in the journal "Journal of Electronic Materials"(2022, 51, 6020-6028), an international academic journal under the title of "Insights into HTM‑Free Mesoporous Perovskite Solar Cells with a Carbon Electrode Using Electrochemical Impedance Spectroscopy Analysis"(https://doi.org/10.1007/s11664-022-09773-7).