| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
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| Outline of Final Research Achievements |
Using single-particle photoluminescence (PL) imaging and spectroscopy, we have studied the size and composition-dependent photo-charge dynamics. From the PL spectra and the corresponding TEM images, it was found that smaller particles, especially less than 10 nm, exhibited quantum confinement effect. Spectral and lifetime analyses of PL revealed that that the photogenerated electrons were equilibrated between the inner bulk CH3NH3PbBr3 and the outer CH3NH3PbIxBr3-x domains with 0 < x < 1 during halide exchange reaction, while stationary holes resided at CH3NH3PbIxBr3-x domains. Moreover, emission signals appeared with a duration of several dozen milliseconds. These are attributable to the PL from individual nanometer-scale iodide-rich domains with x = 2, and their lifetimes are suggested to be limited by reaction with diffusing halide vacancies. Our findings will help to understand the operating principle of perovskite-based devices and facilitate their applications.
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