The effects of hole content (p) and oxygen deficiency (delta) on the zero-field critical current density, Jc0, were investigated for high-quality c-axis oriented Y1-xCaxBa2Cu3O7-delta (x = 0, 0.05, 0.10, 0.20) thin films. Low temperature density these films above optimum doping found to be high primarily determined by concentration, reaching a maximum at p ~ 0.185 +/- 0.005, irrespective level ...