Fast-response and high-responsivity FA(x)MA((1-x))PbI(3) photodetectors fabricated via doctor-blading deposition in ambient condition

Hybrid organolead halide perovskites, a class of materials used in optoelectronic devices, have attracted significant attention due to their performance and fabrication process. This paper reports on a pinhole free, compact, high-quality, mixed-cation (consisting of formamidinium (FA) and methylammonium (MA)) FA(x)MA((1-x))PbI(3) polycrystalline perovskite film prepared in a one-step solution process using a doctor-blading deposition technology under ambient conditions with no subsequent annealing. A perovskite film domain size of up to 100 mu m was obtained. A FA(x)MA((1-x))PbI(3)-based photodetector using a simplestructure glass/FA(x)MA((1-x))PbI(3)/Au device was fabricated. Ultraviolet (UV) high photoresponse reached the near-infrared (NIR) range. Its best responsivity (R) was 10.57 AW(-1) with a response speed of similar to 9.0 ms. Results indicate that this technique results in high-quality, phase-pure, FA(x)MA((1-x))PbI(3) perovskite films and high-performance optoelectronic devices.