Efficient and stable perovskite-silicon tandem solar cells through contact displacement by MgF<i><sub>x</sub></i>.
basic_science · Level V
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- Record sourced from PubMed, PMID 35737811.
- Also identified by DOI 10.1126/science.abn8910.
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Abstract
The performance of perovskite solar cells with inverted polarity (p-i-n) is still limited by recombination at their electron extraction interface, which also lowers the power conversion efficiency (PCE) of p-i-n perovskite-silicon tandem solar cells. A MgF<i><sub>x</sub></i> interlayer with thickness of ~1 nanometer at the perovskite/C<sub>60</sub> interface favorably adjusts the surface energy of the perovskite layer through thermal evaporation, which facilitates efficient electron extraction and displaces C<sub>60</sub> from the perovskite surface to mitigate nonradiative recombination. These effects enable a champion open-circuit voltage of 1.92 volts, an improved fill factor of 80.7%, and an independently certified stabilized PCE of 29.3% for a monolithic perovskite-silicon tandem solar cell ~1 square centimeter in area. The tandem retained ~95% of its initial performance after damp-heat testing (85°C at 85% relative humidity) for >1000 hours.