NOVELTY - A composition (c1) in the form of suspension comprises tungsten oxide nanoparticles selected from nanoparticles (p1) of pure/doped tungsten oxide, and core-shell nanoparticles, where shell is composed of tungsten oxide/doped tungsten oxide, and core is composed of different inorganic material; and homogeneous solvent composition comprising water, and first organic solvent forming binary azeotrope with water. The amount of water in the composition is below total azeotropic water content with respect to first organic solvent. The ratio of nanoparticles:water is below 9:1 wt./wt..    USE - For manufacturing a thin film suitable as a hole transport layer in organic solar cells, in organic light emitting diodes or in organic photo detectors; in photochromic applications; in electrochromic applications; in thermochromic applications; as a catalyst; in sensor applications; in a transistor; in a varistor; in a capacitor; and/or in thermoelectric applications (claimed).    ADVANTAGE - The present composition is suitable for thin film formation on several of substrates while avoiding vapor phase processes. The obtained films have beneficial properties such as these films are obtainable by a solution process; are essentially free of (or free of) residual organic materials after drying at a temperature below 150 degrees C; are thin (below 200 nm); and have a low final surface roughness (below 100 nm). The present manufacturing method of thin films, is advantageous over the known methods, e.g. there is no need for a plasma-cleaning step of the as-deposited films (e.g. by ozone). Also, allows a defect-free production of the thin film, particularly when deposited on hydrophobic substrates.    DETAILED DESCRIPTION - A composition (c1) in the form of a suspension, comprises tungsten oxide nanoparticles (p1) selected from nanoparticles of pure tungsten oxide, nanoparticles of doped tungsten oxide, and core-shell nanoparticles, where the shell is composed of tungsten oxide or doped tungsten oxide and the core is composed of a different inorganic material; and a homogeneous solvent composition comprising water, and a first organic solvent forming a binary azeotrope with water. The amount of water in the solvent composition is below the total azeotropic water content with respect to the first organic solvent. The ratio of nanoparticles:amount of water is below 9:1 wt./wt.. INDEPENDENT CLAIMS are included for the following:    (1) manufacturing (m2) a thin film involving applying the composition (c1) on a substrate or coated substrate; removing the solvent from the composition to obtain a dry film; and optionally treating the dry films at elevated temperature;    (2) a thin film (f2) obtained by the method (m2), where the composition comprises tungsten oxide nanoparticles of core-shell type, where shell is composed of tungsten oxide/doped tungsten oxide, and core is composed of different inorganic material;    (3) an electrical element (e1) comprising the thin film (f2);    (4) a device comprising at least one electrical element (e1), preferably selected from organic electronics, particularly an organic solar cell (OPV), organic light emitting diode (OLED) or organic photo detector; and    (5) manufacturing the composition (c1) involving providing a homogeneous solvent composition; providing nanoparticles; and combining the nanoparticles with the homogeneous solvent composition to obtain a suspension.