2D Ultrathin p‐type ZnTe with High Environmental Stability

The poor air stability hinders the practical application of most 2D materials. P-type 2D ZnTe has drawn widespread attention, thanks to its wide direct bandgap and outstanding environmental stability. However, the controllable synthesis of ultrathin 2D ZnTe remains a huge challenge due to the intrinsic unlayered crystal structure. Here, p-type 2D ultrathin ZnTe flakes are controllably synthesized by using space-confined physical vapor deposition. In situ temperature-dependent Raman and electronical measurements show the thermal stability up to 420 K and outstanding air stability even under humidity of 95%. The ZnTe flakes-based photodetector demonstrates the broadband response varying from the visible to near infrared region, responsivity of 18.3 A W-1 and detectivity (D*) of 2.89 x 10(9) Jones under 405 nm illumination, implying promising potential application in electronics and optoelectronics worked in harsh environment.