研究目的
Investigating the application of phosphomolybdic acid (PMA) as a solution-processable high work function material in efficient vacuum processed perovskite devices.
研究成果
PMA is an effective interlayer for p-i-n type solar cells, as it effectively removes the charge transfer barrier between the ITO electrode and the organic hole transporting layer. The solar cell performance appears to be limited by the conductivity of the PMA layer, which may be overcome by post-deposition treatments or doping strategies.
研究不足
The direct growth of perovskite films onto PMA leads to strong charge carrier recombination, hindering the solar cell photovoltage. The power conversion efficiency (PCE) of the solar cells is still limited by the fill factor (FF), suggesting a limited conductivity of the PMA film.
1：Experimental Design and Method Selection:
The study involved the use of PMA as a hole injection material in perovskite devices. The methodology included the preparation of PMA films on ITO substrates, characterization of their morphological and electronic properties, and their application in perovskite solar cells and LEDs.
2：Sample Selection and Data Sources:
PMA was purchased from Sigma-Aldrich and used as received. The solution was diluted and spin-coated onto ITO coated glass substrates.
3：List of Experimental Equipment and Materials:
AFM for surface morphology, UV photoemission spectroscopy and Kelvin probe for work function measurement, UV-Vis absorption spectrum for optical properties, and solar cell and LED fabrication equipment.
4：Experimental Procedures and Operational Workflow:
PMA films were prepared by spin-coating and annealing. Perovskite films were prepared by dual-source thermal vacuum deposition. Solar cells and LEDs were fabricated and characterized.
5：Data Analysis Methods:
The performance of the devices was analyzed based on current density-voltage (J-V) curves, external quantum efficiency (EQE), and electroluminescence characteristics.
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