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A facile, highly efficient approach to obtain molybdenum trioxide (MoO 3)-doped tungsten trioxide (WO 3) is reported. An annealing process was used to transform ammonium tetrathiotungstate [(NH 4) 2 WS 4] to WO 3 in the presence of oxygen. Ammonium tetrathiomolybdate [(NH 4) 2 MoS 4] was used as a dopant to improve the film for use in an electrochromic (EC) cell.(NH 4) 2 MoS 4 at different concentrations (10, 20, 30, and 40 mM) was added to the (NH 4) 2 WS 4 precursor by sonication and the samples were annealed at 500 C in air. Raman, X-ray diffraction, and X-ray photoelectron spectroscopy measurements confirmed that the (NH 4) 2 WS 4 precursor decomposed to WO 3 and the (NH 4) 2 MoS 4–(NH 4) 2 WS 4 precursor was transformed to MoO 3-doped WO 3 after annealing at 500 C. It is shown that the MoO 3-doped WO 3 film is more uniform and porous than pure WO 3, confirming the doping quality …