Study on Anti-humidity Stability and Morphology Optimization of Perovskite Solar Cells
To greatly improve the photoelectric conversion efficiency and moisture resistance of perovskite solar cells to increase their application potential,4-tertiary butyl pyridine(tBP)was added as an additive to lead iodide(PbI2)precursor solution.The modified PbI2-tBP films and CH3NH3PbI3-tBP films were carefully investigated and tested by thermal field emission scanning electron microscope(FE-SEM),X-ray diffraction(XRD),and UV-visible spectroscopy(UV-vis).The experimental results show that as tBP addition reaches 80 pL/mL,tBP combines with PbI2 to form a porous structure,which is beneficial to the infiltration of iomethylamine(CH3NH3I)solution into the layer of the PbI2 film and promotes the transformation of the PbI2 film into a CH3NH3PbI3 film with no PbI2 residue.The fabricated perovskite solar cell can achieve high moisture resistance.As exposure(without encapsulation)to the ambient air for 500 h,the photoelectric conversion efficiency of the test device can still reach 82％of the initial photoelectric conversion efficiency.This paves the way for device application and commercialization.
perovskite solar cells4-tert-butylpyridine(tBP)wet resistance stabilitymorphology optimization
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