Stabilizing heterostructures of soft perovskite semiconductors.
basic_science · Level V
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- Record sourced from PubMed, PMID 31416961.
- Also identified by DOI 10.1126/science.aax8018.
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Abstract
Here we report a solution-processing strategy to stabilize the perovskite-based heterostructure. Strong Pb-Cl and Pb-O bonds formed between a [CH(NH<sub>2</sub>)<sub>2</sub>] <i><sub>x</sub></i> [CH<sub>3</sub>NH<sub>3</sub>]<sub>1-</sub> <i><sub>x</sub></i> Pb<sub>1+</sub> <i><sub>y</sub></i> I<sub>3</sub> film with a Pb-rich surface and a chlorinated graphene oxide layer. The constructed heterostructure can selectively extract photogenerated charge carriers and impede the loss of decomposed components from soft perovskites, thereby reducing damage to the organic charge-transporting semiconductors. Perovskite solar cells with an aperture area of 1.02 square centimeters maintained 90% of their initial efficiency of 21% after operation at the maximum power point under AM1.5G solar light (100 milliwatts per square centimeter) at 60°C for 1000 hours. The stabilized output efficiency of the aged device was further certified by an accredited test center.