The proposed paper offers designing and simulation of a high-gain and high-efficiency DC/DC Boost converter intended for voltage sources with low inputs i.e. Photovoltaic (PV) cells, which enable the use of Proportional Integral Derivative controller for improved performance of complete system. Generally, high gains are offered by boost convertor at expense of extreme duty cycle, which establishes high voltage stresses across switches. Owing to these stresses, high on-state resistance switches ought to be used. The proposed research discusses in detail the design of high efficiency and high gain DC/DC boost converter, which step up lower DC voltages to higher voltages without compromising gain and efficiency by introducing a coupled inductor. The proposed research presents a comparative study on selection of optimal MOSFET to obtain high efficiency and high gain. Thus, several MOSFETs were studied, reviewed and assessed in terms of performance affecting parameters and results of various MOSFETs have been recorded. Resultantly, high efficiency and high gain were achieved with the removal of voltage spikes across switches and switch stresses were also mitigated Moreover, It is required to maintain constant output voltage at load end. Owing to change in voltage at load and source end, there is a constant variation in converter output voltage. Thus, Proportional Integral Derivative controller is employed to attain constant output voltage regardless of variations in source or load. The complete system has been designed and subsequently simulated in MATLAB Simulink to authenticate system operation.