This work inspects the utilization of all-polymer solar cells (APSCs) in indoor applications
under LED illumination, with a focus on boosting efficiency through simulation-based design. The
study employs a SCAPS TCAD device simulator to investigate the performance of APSCs under
white LED illumination at 1000 lux, with a power density of 0.305 mW/cm2. Initially, the simulator
is validated against experimental results obtained from a fabricated cell utilizing CD1:PBN-21 as
an absorber blend and PEDOT:PSS as a hole transportation layer (HTL), where the initial measured
efficiency is 16.75%. The simulation study includes an examination of both inverted and conventional
cell structures. In the conventional structure, where no electron transportation layer (ETL) is present,
various materials are evaluated for their suitability as the HTL. NiO emerges as the most promising
HTL material, demonstrating the potential to achieve an efficiency exceeding 27%. Conversely, in
the inverted configuration without an HTL, the study explores different ETL materials to engineer
the band alignment at the interface. Among the materials investigated, ZnS emerges as the optimal
choice, recording an efficiency of approximately 33%. In order to reveal the efficiency limitations
of these devices, the interface and bulk defects are concurrently investigated. The findings of this
study underscore the significance of careful material selection and structural design in optimizing
the performance of APSCs for indoor applications.