Nanostructured Quadric‐Confined Quantum Dot–Quantum Well Kesterite Solar Cell: A Pathway for Cost‐Effective Photosensitive Devices

Nanostructure kesterite‐based solar with a combination of multi‐quantum dots (QDs) and multi‐quantum well (QW) region is proposed to improve photoabsorption rate and conversion efficiency. The scope of kesterite hybrid‐confined structure attracts researchers due to their environment‐friendly, encouraging optic‐electrical characteristics and carrier confinement properties. The optimal design of a quadric‐confined QDQW solar cell (QCQDQW) focuses on nanostructures that improve the open‐circuit voltage V oc . This article examines the overall performance of QCQDQW structure by implementing both QD (width 10 nm) and QW (10 nm barrier and 5 nm well width) layers (CZGSe/) considering S/Se composition variations ( x = 0.2–0.8). Moreover, a thin 5 nm barrier layer is engineered between QD and QW layers, enhancing effective carrier quantization and collection in solar cell. The remarkable efficiency of 17.37% and V oc of 0.945 V is obtained for three QW regions and five QD layers with the highest J sc value of 21.06 mA. This study encourages a new direction in quantum‐confined solar structure.