Integration of organic/inorganic hybrid perovskites with metallic or semiconducting phases of 2D MoS nanosheets via solution processing is demonstrated. The results show that the collection of charge carriers is strongly dependent on the electronic properties of the 2D MoS with metallic MoS showing high responsivity and the semiconducting phase exhibiting high on/off ratios.

A hybrid phototransistor is developed with solution-processed organolead trihalide perovskite (MAPbI 3 ) capping indium gallium zinc oxide (IGZO), which well fuses the properties of the two materials in sensitive photodetecting and high-mobility charge transporting, respectively. The MAPbI 3capped IGZO phototransistor demonstrates excellent responsivities of over 25 mA W −1 for lights with photon energies above the bandgap of perovskite light absorber. Besides the high sensitivity to light in both ultraviolet and visible regions, hybrid phototransistor maintains a fair on/off ratio of over 10 6 in the dark, and a field effect mobility of 12.9 cm 2 V −1 s −1 . The perovskite light absorber also obviates the long-standing problem for metal oxide phototransistor, the persistent photoconductivity behavior. Furthermore, fast transient response has been achieved by showing rise-time and fall-time within tens of milliseconds. The newly developed device opens variable optic-electric sensing applications for the integrated oxide-perovskite hybrid phototransistors.

We present here solution-processed photodetectors based on a methyl ammonium lead iodide perovskite (MAPbI3) and nanocrystalline graphite (NCG) hybrid composite. The highest responsivity of the best MAPbI3/NCG photodetector was 795 mA W(-1) at 500 nm visible light, which is almost twice as high as that of the NCG-free MAPbI3 photodetector (408 mA W(-1)). The enhanced performance of the MAPbI3/NCG photodetector arises from the improved charge extraction at the MAPbI3/NCG interface. The dependence of photodetector performance on the mass percentage of NCG (the ratio of NCG to MAPbI3) in the hybrid materials is also reported here, and is correlated to the fabrication process. Moreover, by comparing the responsivity of the devices with different channel lengths, we show that the performance of hybrid photodetectors can be further tuned by tailoring the channel length.

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