Abstract
We demonstrated an effective poly(p-chloro-xylylene) (Parylene-C) encapsulation method for MAPbI3 solar cells. By structural and optical analysis, we confirmed that Parylene-C efficiently slowed the decomposition reaction in MAPbI3. From a water permeability test with different encapsulating materials, we found that Parylene-C-coated MAPbI3 perovskite was successfully passivated from reaction with water, owing to the hydrophobic behavior of Parylene-C. As a result, the Parylene-C-coated MAPbI3 solar cells showed better device stability than uncoated cells, virtually maintaining the initial power conversion efficiency value (15.5 ± 0.3%) for 196 h.
Highlights
We demonstrated an effective poly(p-chloro-xylylene) (Parylene-C) encapsulation method for MAPbI3 solar cells
Several attempts have been made to improve the stability of perovskite solar cells (PSCs) by modifying the crystal structure[19] or replacing the hole-transporting layer (HTL) with carbon nanotube–polymer composites[20]
MAPbI3 perovskite was fabricated using the two-step spin-casting method[25], with the TiO2 and Spiro-OMeTAD used for the electron and hole transporting materials, respectively
Summary
We demonstrated an effective poly(p-chloro-xylylene) (Parylene-C) encapsulation method for MAPbI3 solar cells. Parylene-C successfully passivated a MAPbI3 perovskite film from reaction with water, owing to its hydrophobic behavior. The photovoltaic performance of Parylene-C-coated PSCs was investigated at various air-exposure times, and the Parylene-C-coated PSCs showed improved stability, maintaining almost the initial PCE values (15.5 ± 0.3%) for 196 h.
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