Hong Kong scientists have developed a perovskite solar cell they say can retain more than 90% of its initial efficiency under accelerated testing conditions. It was developed based on a 2D conjugated metal-organic framework that functions as an electron-extraction layer at the interface between perovskite and cathode.
They claim that the cell is the first to offer good long-term stability and high power conversion efficiency with reduced lead leakage.
The Hong Kong group used a 2D structure which is equipped with thiol group as a key functionality.
The City University team said the thiol group possess suitable energy levels that enable them to be an electron-extraction layer where electrons are finally collected by the electrode of the perovskite solar cells. Their molecular engineered metal-organic framework possess the property of a multi-functional semiconductor and can be used to enhance the charge extraction efficiency.
The cell showed an efficiency of 22.02%, a fill factor of 81.28% and open-circuit voltage of 1.2V.
The scientist said their experiments showed that the metal-organic frameworks used as the outer layer of the perovskite solar cell device captured over 80% of the leaked lead ions from the degraded perovskite and formed water-insoluble complexes which would not contaminate the soil.
Culled from EMILIANO BELLINI
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