Abstract
Interfacial materials play a vital role in determining the charge carrier collection for the performance of polymer solar cells (PSCs). Herein, a monomolecular (3‐aminopropyl) triethoxysilane (APTES) layer is deposited onto ZnO, acting as cathode interfacial layer (CIL) in the inverted PSCs. Inverted PBDB‐T:IT‐M PSCs with the ZnO‐APTES CILs exhibit a power conversion efficiency of 11.53% with a short‐circuit current density of 18.37 mA cm−2, an open‐circuit voltage of 0.91 V and fill factor of 68.77%. More than 13% improvement on the power conversion efficiency is achieved by inserting APTES, due to efficient charge collection obtained by a built‐in electric field and reduced oxygen defects at the ZnO surface. The results indicate that the ZnO‐APTES layer is an efficient CIL for inverted PSCs.
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