AI Article Synopsis
- - An interface modification layer is crucial for improving the efficiency of organic solar cells (OSCs) by reducing recombination and enhancing contact between the active layer and electrode, particularly through the doping of the hole-transport layer (HTL) PEDOT:PSS.
- - The study introduces a FeO/GO magnetic nanocomposite as a secondary dopant for PEDOT:PSS, which enhances its electrical properties, allowing for higher power conversion efficiencies (up to 18.91%) and improved stability compared to standard PEDOT:PSS-based devices.
- - The hybrid HTL not only increases hole mobility and charge extraction but also demonstrates versatility in boosting OSC performance across various material combinations, highlighting the effectiveness of magnetic nanocomposites
Article Abstract
An interface modification layer holds paramount significance in reducing interface carrier recombination and improving the ohmic contact between the active layer and the electrode in organic solar cells (OSCs). Modifying or doping the widely used hole-transport layer (HTL) PEDOT:PSS to adjust the work function, conductivity, and acidity has become a common strategy for achieving high-performance OSCs. Metal oxides and two-dimensional materials as secondary dopants into PEDOT:PSS, respectively, as well as a replacement of PEDOT:PSS both exhibit immense potential for achieving high-performance OSCs due to their excellent electrical properties. Herein, we report a method utilizing a FeO/GO magnetic nanocomposite as a secondary dopant for PEDOT:PSS to modulate its inherent properties for constructing high-efficiency OSCs. The magnetic nanocomposite hybrid HTL exhibits a suitable optical transmittance and higher work function. Meanwhile, it is found that the addition of FeO/GO magnetic nanoparticles expands the domain of PEDOT and enhances the phase separation between PEDOT and PSS segments, thereby improving the conductivity of PEDOT:PSS. By fine-tuning the doping ratio of a FeO/GO magnetic nanocomposite in PEDOT:PSS, the best power conversion efficiency of OSCs based on PM6:L8-BO was up to 18.91%. The notable enhancement of the device's performance was due to the enhanced hole mobility and the improved charge extraction, further complemented by the decreased likelihood of interface recombination brought about by the hybrid HTL. Compared with PEDOT:PSS-based OSCs, an enhanced stability of the hybrid HTL-based device was also obtained. In addition, the diverse adaptability of the hybrid HTL was demonstrated in enhancing the performance of OSCs that are based on PM6:Y6 and PBDB-T:ITIC. The effectiveness and versatility of a magnetic nanocomposite hybrid HTL present opportunities for achieving high-performance OSCs.
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| http://dx.doi.org/10.1021/acsami.4c15255 | DOI Listing |
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