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The need for affordable, clean, efficient, and sustainable solar cells informed this study. Metal oxide TiO₂/NiO heterojunction solar cells were fabricated using the spray pyrolysis technique. The optoelectronic properties of the heterojunction were determined. The fabricated solar cells exhibit a short‐circuit current of 16.8 mA, open‐circuit voltage of 350 mV, fill factor of 0.39, and conversion efficiency of 2.30% under 100 mW/cm² illumination. This study will help advance the course for the development of low‐cost, environmentally friendly, and sustainable solar cell materials from metal oxides.