Map of the Month – February
Welcome to Edinburgh Instruments monthly blog celebrating our work in Raman, Photoluminescence, and Fluorescence Lifetime Imaging. Every month we will highlight our pick for Map of the Month to show how our spectrometers can be used to reveal all the hidden secrets in your samples.
Vertically aligned carbon nanotubes (VACNTs) are a promising material being investigated as a hole extraction layer in solar cells. To observe hole transfer from the perovskite into the VACNT towers, the surface of the ITO/VACNT/Perovskite sample was imaged using photoluminescence (PL) intensity mapping, shown on the left. The RMS1000 can be equipped with pulsed laser sources and time-correlated single-photon counting (TCSPC) electronics for PL lifetime mapping. This provides complementary information to the spectral PL mapping and can be used as a confirmation measurement that hole transfer is occurring. The PL lifetime map, presented on the right, shows that the average PL lifetime of the perovskite decreases from ~100 ns to ~60 ns when VACNTs are beneath the perovskite.