Structure Design of Solid Additive Assisted Photoactive Layer with Multi Step Deposition for Charge Injection Mitigated Organic Photodetectors
발표자
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초록
내용
The volatile solid additive 1,3,5-trichlorobenzene (1,3,5-TCB) has recently been employed to induce optimal crystallinity and phase separation of non-fullerene acceptor (NFA)-based active layers in organic photodetectors (OPDs). Despite these advantages, the 1,3,5-TCB additive has the adverse effect of reducing the lowest unoccupied molecular orbital (LUMO) level of the NFA material, thereby reducing the charge injection barrier. In this study, we address this issue by depositing active layers based on the 1,3,5-TCB solid additive via a multi-step deposition process (MSD), which allows for more favorable vertical phase separation of the donor and acceptor regions with enhanced π-π stacking. We conduct comprehensive comparative measurements of the light detecting abilities of MSD devices and conventional BHJ-based devices. The effects of MSD on the optical, electrical, morphological properties, and stability of OPDs were investigated.