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[EN] An effective n-type doping of ZnO thin films electrochemically synthetized was achieved by varying the chloride ion concentration in the starting electrolyte. The ratio between chloride and zinc cations was varied between 0 and 2 while the zinc concentration in the solution was kept constant. When the concentration of chloride in the bath increases an effective n-type doping of ZnO films takes place. n-type doping is evidenced by the rise of donors concentration, obtained from Mott-Schottky measurements, as well as from the blueshift observed in the optical gap owing to the Burstein-Moss effect. ; This work was supported by Spanish Government through MCINN grant MAT2009-14625-C03-03 and European Commission through NanoCIS project FP7-PEOPLE-2010-IRSES (ref. 269279). ; Cembrero Coca, P.; Mollar García, MA.; Singh, K.; Marí Soucase, B. (2013). Effective electrochemical n-type doping of ZnO thin films for optoelectronic window applications. Journal of Solid State Electrochemistry. 2(7):Q108-Q112. https://doi.org/10.1149/2.023307jss ; S ; Q108 ; Q112 ; 2 ; 7 ; Guill�n-Santiago, A., de la L. Olvera, M., Maldonado, A., Asomoza, R., & Acosta, D. R. (2004). Electrical, structural and morphological properties of chemically sprayed F-doped ZnO films: effect of the ageing-time of the starting solution, solvent and substrate temperature. physica status solidi (a), 201(5), 952-959. doi:10.1002/pssa.200306727 ; Oba, F., Choi, M., Togo, A., & Tanaka, I. (2011). Point defects in ZnO: an approach from first principles. Science and Technology of Advanced Materials, 12(3), 034302. doi:10.1088/1468-6996/12/3/034302 ; Oh, B.-Y., Jeong, M.-C., Lee, W., & Myoung, J.-M. (2005). Properties of transparent conductive ZnO:Al films prepared by co-sputtering. Journal of Crystal Growth, 274(3-4), 453-457. doi:10.1016/j.jcrysgro.2004.10.026 ; Manouni, A. E., Manjón, F. J., Mollar, M., Marí, B., Gómez, R., López, M. C., & Ramos-Barrado, J. R. (2006). Effect of aluminium doping on zinc oxide thin films grown by spray ...