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Advances in controlled synthesis,processing,and tuning of the properties of organic conjugated polymers and peroskites have enabled significantly enhanced performance of organic and hybrid electronic devices.Our laboratory employs a molecular engineering approach to develop processible low band-gap polymers with high charge carrier mobility for enhancing power conversion efficiency of single junction solar cells to~11%.We have also developed several innovative strategies to modify the interface of bulk-heterojunction devices and create new device architectures to fully explore their potential for solar applications.The performance of polymer and hybrid solar cells is strongly dependent on their efficiency in harvesting light,exciton dissociation,charge transport,and charge collection at the metal/organic/metal oxide or the metal/perovskite/metal oxide interfaces.In this talk,the integrated approach of combining material design,interface,and device engineering to significantly improve the performance of polymer and hybrid perovskite photovoltaic cells(PCE of >17%)will be discussed.Specific emphasis will be placed on the development of low band-gap polymers with reduced reorganizational energy and proper energy levels,formation of optimized morphology of bulk-heterojunction layer,and minimized interfacial energy barriers using functional surfactants and graphene oxide.At the end,several new device architectures and optical engineering strategies to make tandem cells and semitransparent solar cells will be discussed to explore the full promise of polymer and perovskite hybrid solar cells.