▎ 摘　　要

NOVELTY - A thin film (10) comprises a metal oxide nanomaterial doped with a triazine skeleton material. USE - Thin film is used as or for forming hole-transport layer of photoelectric device (claimed) for display device. Uses include but are not limited to smart phone, tablet computer, laptop, digital camera, digital video camera, smart weighing electronic scale, car display, television, electronic-book reader, smart bracelet, smart watch, and virtual reality helmet. ADVANTAGE - The thin film has excellent stability, hole mobility, and conductivity, and provides photoelectric device with high efficiency. The metal oxide nanomaterial used in the thin film can be easily and economically prepared with high yield. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: preparation of the thin film, which involves using a metal oxide precursor doped with the triazine skeleton material; and #a photoelectric device (100). DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the photoelectric device. 10Hole-transport thin film 20Anode 30Light-emitting layer 40Cathode 100Photoelectric device