Long-Lived Photoinduced Charge Separation Inside Polarity Gradient Capsules


  • This work was supported by the Max Planck Society and the Deutsche Forschungsgemeinschaft SFB 448. L. Li thanks Dr. C. Tedeschi for helpful discussions in this project.


Hollow capsules with polarity gradients can be built up by a layer-by-layer technique. After laser excitation, long-lived charge separation was observed. Time-dependent measurements, observing the decay of pyrene cation and anion absorption, show that the sample configuration has an influence that can be ascribed to the polarity gradient The charge separation can therefore be predicted due to the establishment of the polarity gradient over nanometer dimensions.