Stacked perovskite photodetectors for multi-color fluorescence detection

Triple cation perovskite photodetectors with different feature bandgaps were stacked and sealed for multi-color fluorescence detection. Fluorescence consisting of different wavelength photons could be absorbed sequentially by the corresponding layers in the stacked photodetectors, thereby promising a high quantum efficiency and allowing better spatial resolution in principle. Experimentally, fluorescent quantum dots of central wavelengths of 650 nm, 690 nm, and 777 nm were detected simultaneously in a mixed solution. The LODs of the three kinds of CdTe QDs are 6.16, 7.25 and 8.11 nM, respectively, and the deviation is smaller than 20%. The results show that the stacked perovskite detector is promising for the application of multi-color fluorescence analysis.