Recently, hole-conductor-free perovskite solar cells (PSCs) with carbon counter electrode have attracted great attention for high stability and low fabrication cost. We can lower the cost and simplify the manufacturing process of PSCs by low-temperature processing instead of sintering which requires high temperature.
We introduce solid-gas reaction between dimethylammonium lead iodide (DMAPbI3) in solid state under low-temperature-processed carbon layer and methylamine gas that has passed through the counter electrode for perovskite formation. In this case, PSCs exhibits higher photo-electric conversion efficiency of 12.4% than that of control devices (9.6%). It is attributed to the liquid crystal intermediate and volume expansion during perovskite formation. Due to its good permeability and fluidity, intermediate can decrease defects by filling cracks at the interface between perovskite and carbon layer.
We published this result in "Optik" under the title of "Formation of perovskite by solid-gas reaction through low-temperature carbon counter electrode in hole-conductor-free perovskite solar cells"(https://doi.org/10.1016/j.ijleo.2024.171628).
