VLSI (Very Large Scale Integration) plays a crucial role in energy harvesting systems by enabling the integration of various components onto a single chip. This facilitates the miniaturization of energy harvesting modules and optimization of overall system performance. Some key applications of VLSI in energy harvesting systems include integrated power management circuits, analog-to-digital converters, sensor interfaces, microcontrollers, and wireless communication and energy storage elements. VLSI allows compact system design while reducing power losses and maximizing energy conversion efficiency for applications such as wireless sensor networks.