My current research work aims to develop high-performance infrared lead sulfide (PbS) colloidal quantum dots (CQDs) based building integrated photovoltaics (BIPVs). Mono-dispersed high-quality PbS CQDS will be synthesized, and the performance improvement of PbS CQDs will be investigated by mixing the electron-rich materials with PbS CQDs and two distinct PbS CQDs. The performance optimization of the PbS CQDs-based devices will be examined through simulations such as SCAPS and the transfer matrix method. After the successful development of highly efficient semitransparent BIPV devices, large-scale semitransparent BIPV modules will be developed for practical applications such as energy harvesting smart windows for buildings.  The success of this project will open the opportunity to develop high-performance four-terminal tandem semi-transparent photovoltaic with perovskite/organic and CQDs to utilize the greater part of the solar spectrum.