The devices yield a photoresponsivity of 0.95 AW −1 and a high specific detectivity of 2.8 × 10 12 Jones with an external quantum efficiency (EQE) approaching 182% at −1.0 V under 650 nm illumination.
The photodetectors exhibit a broadband response from the near-ultraviolet to the near-infrared (330–800 nm), achieving a high on/off current ratio of 8.6 × 10 4 and fast response times of 7.2/19.5 μs. Here, we demonstrate low-voltage, high-overall-performance photodiode-type photodetectors in a sandwiched geometry based on polycrystalline α-FAPbI 3 thin films synthesized by a one-step solution processing method and post-annealing treatment. To date, only a few photoconductor-type photodetectors based on FAPbI 3 single crystals and polycrystalline thin films in a lateral structure have been reported. As a new type of light-harvesting materials, formamidinium lead iodide (FAPbI 3) is known to possess excellent optoelectronic properties even exceeding those of methylammonium lead iodide (MAPbI 3). The reproducibilities of the tracer method as a whole (analytical determination and calculation of the tracer portions in the tracer plant samples) amounted to 7% at the maximum (with one exception) by contrast, the individual differences between the three plants investigated were much larger (up to 80%).Photodetectors based on three dimensional organic–inorganic lead halide perovskites have recently received significant attention. Dependent on the time of contamination, tracer portions of 0.2 to 12% have been measured, corresponding to a maximum of 2.3% of the foliar application of the tracer molybdate.
In this paper solely the tracer portions transferred from the leaf into the tuber of the potato have been determined. As several tracers have been used the multivariate linear regression methods has been applied to calculate the portions of tracer Mo present in the potato samples from the isotopie ratios measured and to estimate their reproducibilities. A tracer technique based on multiple stable Mo isotopes and thermionic quadrupole mass spectrometry for isotopie analysis of plant tissue was developed and has been applied in the long-term study of foliar absorption of Mo by potato plants.
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