Figure 2: Energy stability of 2H- and 1T’-MoS2.
From: Origin of Structural Transformation in Mono- and Bi-Layered Molybdenum Disulfide

Energy difference per MoS2 molecular between the 2H- and 1T’-phase as a function of extra electron concentration. The critical extra electron concentrations for the 2H→1T’ phase transition are 0.55 and 0.78 e/f.u. in mono- and bi-layers, respectively.