Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.384
Publication date: 7th February 2022
Integrated voltage-modulated multispectral photodetectors are desirable for high-resolution imaging and secured light communication. Research on this type of device has recently extended from the conventional vacuum-based inorganic semiconductor materials to emerging ones, particularly organic and perovskite semiconductors. These materials have strong absorbance, easily tunable absorption range, fast and balanced charge transport, and compatibility with facile solution processing. So far, multispectral photodetectors based on organic or perovskite materials have been reported, but the potential of hybrid devices incorporating both on multispectral photodetection is left unexplored. In this study, we report our effort to design perovskite/organic hybrid photodetectors with two distinct response ranges under opposite operation biases. The perovskite layer, with a wider bandgap, absorbs light of shorter wavelengths, leaving long-wavelength photons for the organic bulk heterojunction. In this way, the first detection band is defined by the absorption cutoff of the perovskite material, and the second spans from this cutoff to that of the organic bulk heterojunction. The device is configured in a symmetric manner with a structure of ITO/SnO2/perovskite/bulk heterojunction/SnO2/Ag. This configuration, in addition to the band bending at the perovskite/bulk heterojunction interface, enables selective extractions of charge carriers from the perovskite layer under a forward bias and from the organic layer under a reverse bias. In one example with a FAPbBr1.5Cl1.5 perovskite layer and an F8T2:PC61BM organic bulk heterojunction, selective photodetection for blue and green light has been realized with decent responsivities over 100 mA/W. The device shows rejection ratios of over ten at the peak detection wavelengths. The generalizability of this design is further demonstrated with another example employing the same perovskite material but a PTB7-Th:PC71BM organic layer. The hybrid device is also advantageous in consecutive solution-based fabrication, owing to the orthogonal solvents used for different layers, reducing the fabrication complexity. The perovskite/organic hybrid photodetectors open new possibilities for high-performing integrated multispectral photodetectors suitable for a wide range of applications.
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