Large‐area high quality PtSe₂ thin film with versatile polarity

Abstract Two‐dimensional (2D) materials have attracted increasing attention for their outstanding structural and electrical properties. However, for mass‐production of field effect transistors (FETs) and potential applications in integrated circuits, large‐area and uniform 2D thin films with high mobility, large on‐off ratio, and desired polarity are needed to synthesize firstly. Here, a transfer‐free growth method for platinum diselenide (PtSe₂) films has been developed. The PtSe₂ films have been synthesized with various thicknesses in centimeter‐sized scale. Typical FET made from a few layer PtSe₂ show p‐type unipolar, with a high field‐effect hole mobility of 6.2 cm² V⁻¹ s⁻¹ and an on‐off ratio of 5 × 10³. The versatile semimetal‐unipolar‐ambipolar transition in synthesized PtSe₂ films is also firstly observed as the thickness thinning. This work realizes the large‐scale preparation of PtSe₂ with prominent electrical properties and provides a new strategy for polarity's modulation.