NOVELTY - The method comprises selecting a dopant based core/shell/shell semiconductor comprising an alloy of cadmium sulfide (CdS) and zinc sulfide (ZnS) semiconductor materials to form a core, and tuning the semiconductor by changing the amount of CdS and ZnS in the alloy composition of the dopant based core. A concentric layer is embedded with the dopant manganese (Mn) forming an inner shell surrounding the core and an outer shell of ZnS. The core/shell/shell semiconductor has a quantum dot core, and an excitation spectrum that captures solar light in a wavelength of 275-490 nm.    USE - The method is useful for tuning a dopant based core/shell/shell semiconductor, which is useful as a high-performance solar cell absorber material and an electroluminescent phosphor material and in sensitive ultra-small bioimaging probes and spin-based electronics such as spintronics.    ADVANTAGE - The method is capable of efficiently tuning the dopant based core/shell/shell semiconductor with minimal lattice mismatch.    DETAILED DESCRIPTION - The method comprises selecting a dopant based core/shell/shell semiconductor comprising an alloy of cadmium sulfide (CdS) and zinc sulfide (ZnS) semiconductor materials to form a core, and tuning the semiconductor by changing the amount of CdS and ZnS in the alloy composition of the dopant based core. A concentric layer is embedded with the dopant manganese (Mn) forming an inner shell surrounding the core and an outer shell of ZnS. The core/shell/shell semiconductor has a quantum dot core, an excitation spectrum that captures solar light in a wavelength of 275-490 nm, and an average size of 3-4 nm in diameter. The outer shell of ZnS is added to allow the fine tuning of an excitation band-gap, to cover a wide band gap of 2.4-4 eV and to emit a bright yellow/orange light at 590 wavelength. The alloy of CdS and ZnS varies from 100% ZnS core to 100% CdS core to tune the photo-luminescence excitation (PLE) spectra of the dopant based core/shell/shell semiconductor. The PLE spectra shows a blue shift when the core composition changes to 100% ZnS exhibiting blue light emission property with peak position at 315-320 nm wave length, and shows a red shift when the core composition changes to 100% CdS exhibiting red light emission property with peak position at 670 nm wavelength.    DESCRIPTION OF DRAWING(S) - The diagram shows a structural model of cadmium sulfide/cadmium zinc sulfide/zinc sulfide core/shell/shell semiconductor quantum dot.