Individually Observed Surface Passivation and Linking Effects of Oleylamine on Metal Halide Perovskite Films
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초록
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The synergetic effects of the linker molecule oleylamine(OAm) substituting A-site vacancies were separately observed in metal-halide perovskite films by adopting a simple drying process during perovskite structure formation. Without the drying process, the synergetic effect was observed in the OAm added films. As a linking effect, the (100) vertical alignment of crystals was improved and the surface passivation was also observed. However, when dry process applied before thermal annealing, the only passivation effect of the OAm was spotlighted. Despite to the lack of linking effect, the device performance was improved by the surface passivation effect in dry processed film. Despite the initial device performance of the OAm device showed the most improved power conversion efficiency (PCE), the PCE of OAm + Dry device degraded the least due to strongly induced passivation effect. The OAm + Dry maintained 70.4% of their initial PCE after 1000 h without encapsulation in the ambient air.