Adhesive printing of chlorinated acceptor-containing flip-domain photoactive layers for enhanced charge transport in organic photoelectronic devices

초록

Non-fullerene acceptors have been continuously adopted in organic photoelectronic devices to achieve high performance. However, the chlorinated, long side-chain acceptor BTP-4Cl-16 exhibits a relatively low current density due to excessive morphological agglomeration, which often limits its application. To address these limitations, we report a novel strategy that adopts an adhesive printing technique to form a PM6:BTP-4Cl-16 photoactive layer. In this study, the adhesive printing technique induced phase separation and thus optimized the bulk heterojunction (BHJ) fibrillar morphology, resulting in a reduction in series resistance and suppressed recombination. Consequently, the optimized organic photovoltaic achieved an enhanced short-circuit current density of 28.13 mA cm-2 and a peak power conversion efficiency of 15.21%. When integrated into organic photodetectors, the adhesive-printed BHJ effectively shortened the response time by approximately 13% and minimized the noise spectral density, increasing the maximum detectivity to 5.03 & times; 1010 Jones, a 44.5% increase. Notably, devices fabricated via green-solvent-based ambient processing maintained 80% of their initial performance, demonstrating superior process stability over the spin-coated devices. These improvements are attributed to the formation of stable p- and n-type flip domains that facilitate efficient charge transport. Overall, these findings provide deep insights into chlorinated acceptor-containing BHJ materials and offer a versatile platform for designing improved performance organic photoelectronic devices.

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