The surfaceworkfunction of transparent conducting oxides is a critical parameter influencing device efficiency by controlling charge transport across interfaces. In this study, Al-dopedCdO films were deposited on glass substrates by rfmagnetronsputtering with and without oxygenflow. For Al-dopedCdO films deposited with (without) oxygenflow, we measure the high (low) surfaceworkfunction close to 5.4 (4.6) eV. Our results suggest a method for fabricating Al-dopedCdOelectrodes with large, tunable workfunctions that could be relevant in designing electrodes for improving the performance of optoelectronic and electronic devices.