This paper reports the fabrication and characterization of the extended piezoelectric properties of Ba-deficient BaZnO2 (Ba1-xZnO2) nanowires. The study highlights can be summarized as follows: (1) a facile fabrication method of Ba1-xZnO2 through pH modulation using solvothermal synthesis is developed, (2) impurities are minimized and the morphology of Ba1-xZnO2 is tailored using various substrates, and (3) the piezotronic and piezophototronic properties of Ba1-xZnO2 are characterized. (C) 2018 Elsevier B.V. All rights reserved.