Wireless implantable technologies are becoming more common in biomedical applications such as physical identification, real-time health monitoring, and physiological trait recording. Current implantable devices, which frequently require surgical replacement, are powered by batteries. Self-powered implanted devices are appealing in this sense for real-time monitoring of human physiological features. Furthermore, electricity collection and generation beneath human tissue remains a serious hurdle. Nonetheless, as packaging and nanotechnology improve, alternate harvesting approaches based on piezoelectricity, thermoelectricity, biofuel, and radio frequency power transfer are emerging. All of these approaches have constraints such as limited power output, bulky size, or low efficiency. Photovoltaic (PV) energy conversion is one of the most promising candidates for implantable applications due to their higher-power conversion efficiencies and small size. Because of its greater conversion efficiencies and small size, photovoltaic (PV) energy conversion is one of the most attractive possibilities for implantable applications.