Abstract
AbstractSimplifying solution‐processing of bulk‐heterojunction (BHJ) organic solar cells (OSCs) via efficient interfacial layers with good generality is in great demand for pushing their large‐scale applications. In this study, such a novel and cost‐effective self‐assembled monolayer (SAM) is reported herein as efficient hole transport layer (HTL) for high efficiency OSCs. The SAM‐structured 4‐(5,9‐dibromo‐7H‐dibenzo[c,g]carbazol‐7‐yl)butyl)phosphonic acid (DCB‐BPA) enables not only enhanced photon harvesting in the active layer but also minimized nonradiative recombination losses to improve interface charge extraction/transport. As a consequence, high short‐circuit current (≈28.07 mA cm−2) is achieved for PM6:BTP‐eC9 based OSCs to deliver a champion power conversion efficiency of 18.16%, among the highest values for OSCs using small organic HTLs to date. Importantly, good generality of this SAMs is demonstrated for representative high‐efficiency BHJ OSCs systems like PM6:Y6 and PM6:PC61BM, outperforming conventional poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate)‐based counterparts. Excitingly, the SAM is applicable for large‐area HTL processing via immersion method, affording 16.59% efficiency for PM6:BTP‐BO‐4Cl based OSCs. This study highlights the great potential of engineered SAMs for facile large‐scale fabrication of high performance OSCs.
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