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We applied dual-active-layer (DAL) modulation to solution-processed AlInZnO (AIZO)/InZnO (IZO) DAL thin-film transistors (TFTs) to realize high performance at 350°C. The electrical characteristics of the DAL TFTs were affected by the In-versus-Zn ratio of each channel and the thickness of the IZO. This caused a difference in the carrier concentrations of the two channels and also changed the energy barrier height at the junction between the channels. A DAL TFT with optimized carrier concentration and energy barrier height yielded a competitive field-effect mobility of 5.62 cm2/V · s, a high ON/OFF ratio of 9.0 × 106, and a steep subthreshold swing of 0.53 V/dec.