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Efficient Polymer Solar Cells Employing Solutiona??Processed Conjugated Polyelectrolytes with Differently Charged Side Chains
摘要： Poly(6-(4,7-dimethyl-2H-benzo[d][1,2,3]triazol-2-yl)-N,N,N-trimethylhexan-1 aminium iodide) (PBTz-TMAI) and poly(sodium 4-(4,7-dimethyl-2H-benzo[d][1,2,3]triazol-2-yl)butane-1-sulfonate) (PBTz-SO3Na) based on the same benzotriazole-conjugated backbone but with ammonium and sulfonated side chains are designed and synthesized through side-chain functionalization and Yamamoto polymerization, respectively, and are used as the cathode interlayers in fullerene- and non-fullerene-based polymer solar cells. The interfacial modification of PBTz-TMAI and PBTz-SO3Na onto the active layer achieves good energy alignment at cathode electrodes and optimized exciton-dissociation efficiency from the active layer. Consequently, the power conversion efficiencies (PCEs) of 7.8% and 9.6% are obtained for the fullerene PTB7:PC71BM-based and non-fullerene PBDB-T:ITIC-based polymer solar cells (PSCs) with PBTz-SO3Na interlayer. The PCS devices based on PTB7:PC71BM and PBDB-T:ITIC active layers with PBTz-TMAI interlayer achieved a remarkably improved performance with PCEs of 8.2% and 10.2%, respectively.
关键词： cathode interlayers,polymer solar cells,conjugated polyelectrolytes
更新于2025-09-23 15:19:57
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Tailoring and Modifying an Organic Electron Acceptor toward the Cathode Interlayer for Highly Efficient Organic Solar Cells
摘要： With the rapid advance of organic photovoltaic materials, the energy level structure, active layer morphology, and fabrication procedure of organic solar cells (OSCs) are changed significantly. Thus, the photoelectronic properties of many traditional electrode interlayers have become unsuitable for modifying new active layers; this limits the further enhancement in OSC efficiencies. Herein, a new design strategy of tailoring the end-capping unit, ITIC, to develop a cathode interlayer (CIL) material for achieving high power conversion efficiency (PCE) in OSCs is demonstrated. The excellent electron accepting capacity, suitable energy level, and good film-forming ability endow the S-3 molecule with an outstanding electron extraction property. A device with S-3 shows a PCE of 16.6%, which is among the top values in the field of OSCs. More importantly, it is demonstrated that the electrostatic potential difference between the CIL molecule and the polymer donor plays a crucial role in promoting exciton dissociation at the CIL/active layer interface, contributing to additional charge generation; this is crucial for enhancement of the current density. The results of this work not only develop a new design strategy for high-performance CIL, but also demonstrate a reliable approach of density functional theory (DFT) calculation to predict the effect of the CIL chemical structure on exciton dissociation in OSCs.
关键词： organic electron acceptors,cathode interlayers,charge density difference,organic solar cells,high efficiency
更新于2025-09-12 10:27:22