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Chalcogen‐Fused Perylene Diimides‐Based Non‐Fullerene Acceptors for High Performance Organic Solar Cells: Insight into the Effect of O, S and Se
摘要： Three perylene diimide tetramers annulated by oxygen (O), sulfur (S) and selenium (Se), named as SF-4PDI-O, SF-4PDI-S and SF-4PDI-Se, are designed, synthesized and paired with polymeric donor PDBT-T1 to construct OSCs. The heteroatoms’ effect on photoelectric properties, chemical geometry, charge transport, active-layer morphology, and photovoltaic performance are investigated in detail. These PDI acceptors exhibit similar absorption profile; while HOMOs and LUMOs are simultaneously upshifted when heteroatoms are altered from O, S to Se due to the gradually weakening electronegativity. Alongside PDBT-T1, SF-4PDI-O achieved the outstanding PCE of 8.904% with a high FF of 0.706, outcompeting its S-annulated and Se-annulated counterparts. The superiority of PDBT-T1: SF-4PDI-O system lies in stronger crystallinity, more balanced hole and electron mobilities, weaker bimolecular recombination, coupled with more efficient charge transfer and collection. These results shed light on the invention of high-performance PDI acceptors by oxygen-decorated methodology.
关键词： chalcogen,nonfullerene,organic solar cells,perylene diimides,small molecule acceptors
更新于2025-09-11 14:15:04
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Enhanced Near‐Infrared Photoresponse of Inverted Perovskite Solar Cells Through Rational Design of Bulk‐Heterojunction Electron‐Transporting Layers
摘要： How to extend the photoresponse of perovskite solar cells (PVSCs) to the region of near-infrared (NIR)/infrared light has become an appealing research subject in this field since it can better harness the solar irradiation. Herein, the typical fullerene electron-transporting layer (ETL) of an inverted PVSC is systematically engineered to enhance device’s NIR photoresponse. A low bandgap nonfullerene acceptor (NFA) is incorporated into the fullerene ETL aiming to intercept the NIR light passing through the device. However, despite forming type II charge transfer with fullerene, the blended NFA cannot enhance the device’s NIR photoresponse, as limited by the poor dissociation of photoexciton induced by NIR light. Fortunately, it can be addressed by adding a p-type polymer. The ternary bulk-heterojunction (BHJ) ETL is demonstrated to effectively enhance the device’s NIR photoresponse due to the better cascade-energy-level alignment and increased hole mobility. By further optimizing the morphology of such a BHJ ETL, the derived PVSC is finally demonstrated to possess a 40% external quantum efficiency at 800 nm with photoresponse extended to the NIR region (to 950 nm), contributing ≈9% of the overall photocurrent. This study unveils an effective and simple approach for enhancing the NIR photoresponse of inverted PVSCs.
关键词： bulk-heterojunctions,electron-transporting layers,inverted perovskite solar cells,nonfullerene acceptors,NIR photoresponse
更新于2025-09-11 14:15:04
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High Performance Roll-to-Roll Produced Fullerene-Free Organic Photovoltaic Devices via Temperature-Controlled Slot Die Coating
摘要： Solution-processed organic photovoltaics (OPVs) have continued to show their potential as a low-cost power generation technology; however, there has been a significant gap between device efficiencies fabricated with lab-scale techniques—i.e., spin coating—and scalable deposition methods. Herein, temperature-controlled slot die deposition is developed for the photoactive layer of OPVs. The influence of solution and substrate temperatures on photoactive films and their effects on power conversion efficiency (PCE) in slot die coated OPVs using a 3D printer-based slot die coater are studied on the basis of device performance, molecular structure, film morphology, and carrier transport behavior. These studies clearly demonstrate that both substrate and solution temperatures during slot die coating can influence device performance, and the combination of hot substrate (120 °C) and hot solution (90 °C) conditions result in mechanically robust films with PCE values up to 10.0% using this scalable deposition method in air. The efficiency is close to that of state-of-the-art devices fabricated by spin coating. The deposition condition is translated to roll-to-roll processing without further modification and results in flexible OPVs with PCE values above 7%. The results underscore the promising potential of temperature-controlled slot die coating for roll-to-roll manufacturing of high performance OPVs.
关键词： printed solar cells,flexible solar cells,3d printer,roll-to-roll,nonfullerene acceptor
更新于2025-09-09 09:28:46