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Organic Solar Cells Based on Small Molecule Donor and Polymer Acceptor Operating at 150 ?°C
摘要： Organic Solar Cells Based on Small Molecule Donor and Polymer Acceptor Operating at 150 oC. Inorganic or organic solar cells always operate at temperature lower than 100 oC and are not suitable for operating at high temperature. In this work, using blends of small molecular donor and polymer acceptor (MD/PA-type) as the active layers, we develop efficient and stable organic solar cells (OSCs), which can operate at temperature up to 150 oC. The device exhibits a power conversion efficiency (PCE) of 9.51%, which is the highest value reported to date for MD/PA-type OSCs. After thermal treatment at 150 oC for 72 hours, the device can retain 84% of its initial PCE value. This superior device stability at high temperature is attributed to the high phase transition temperatures of the two materials in the MD/PA-type active layer. This work suggests a new advantage of high-temperature tolerance for OSCs.
关键词： Power Conversion Efficiency,Small Molecule Donor,Organic Solar Cells,Polymer Acceptor,High Temperature Operation
更新于2025-09-23 15:21:01
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10.13% Efficiency Alla??Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors
摘要： All-polymer solar cells (all-PSCs) are one of the most promising flexible and wearable energy generators due to their excellent morphology stability and mechanical robustness. However, it has been limited light absorption capacity for most polymer acceptors that hinders the improvement of power conversion efficiency (PCE) of all-PSCs. Herein, by simultaneously increasing the conjugation of the acceptor unit and enhancing the electron-donating ability of the donor unit, a novel narrow-bandgap polymer acceptor PF3-DTCO based on a A-D-A-structured acceptor unit ITIC16 and a carbon-oxygen (C-O)-bridged donor unit DTCO was developed. Extended conjugation of the acceptor units from IDIC16 to ITIC16 result in a red-shifted absorption spectrum and improved absorption coefficient without significant LUMO level reduction. Moreover, in addition to further broadening the absorption spectrum by the enhanced intramolecular charge transfer effect, the introduction of C-O-bridges into donor unit improves the absorption coefficient and electron-mobility, as well as optimizes the morphology and molecular order of active layers. As a result, the PF3-DTCO achieved a higher PCE of 10.13% with a higher short-circuit current density (Jsc) of 15.75 mA cm-2 in all-PSCs compared to its original polymer acceptor PF2-DTC (PCE=8.95% and Jsc=13.82 mA cm-2). Our work provides a promising method to construct high-performance polymer acceptors with excellent optical absorption for efficient all-PSCs.
关键词： optical absorption,all-polymer solar cells,polymer acceptor,carbon-oxygen-bridging,power conversion efficiency
更新于2025-09-23 15:19:57
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Simultaneous enhanced efficiency and thermal stability in organic solar cells from a polymer acceptor additive
摘要： The thermal stability of organic solar cells is critical for practical applications of this emerging technology. Thus, effective approaches and strategies need to be found to alleviate their inherent thermal instability. Here, we show a polymer acceptor-doping general strategy and report a thermally stable bulk heterojunction photovoltaic system, which exhibits an improved power conversion efficiency of 15.10%. Supported by statistical analyses of device degradation data, and morphological characteristics and physical mechanisms study, this polymer-doping blend shows a longer lifetime, nearly keeping its efficiency (t = 800 h) under accelerated aging tests at 150 oC. Further analysis of the degradation behaviors indicates a bright future of this system in outer space applications. Notably, the use of polymer acceptor as a dual function additive in the other four photovoltaic systems was also confirmed, demonstrating the good generality of this polymer-doping strategy.
关键词： polymer acceptor,power conversion efficiency,bulk heterojunction,organic solar cells,thermal stability
更新于2025-09-16 10:30:52
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Amorphous Polymer Acceptor Containing B ← N Units Matches Various Polymer Donors for All-Polymer Solar Cells
摘要： Polymer acceptors for high-efficiency all-polymer solar cells (all-PSCs) are generally semicrystalline. In this manuscript, we report an amorphous polymer acceptor, which matches well with a variety of polymer donors to produce efficient all-PSCs. The amorphous polymer acceptor (rr-PBN) is a regiorandom polymer consisting of alternating asymmetric B←N bridged thienylthiazole (BNTT) unit and pyridine-flanked diketopyrrolopyrrole (PyDPP) unit. It is amorphous in thin film because of its regiorandom structure and the large steric hindrance. rr-PBN shows deep LUMO/HOMO energy levels of ?3.71/?5.81 eV, strong sunlight harvesting capability and high electron mobility of 2.20 × 10?4 cm2 V?1 s?1. As a polymer acceptor, rr-PBN matches well with three commercially available polymer donors, J71, PTB7-Th, and PffBT4T-2OD to give excellent percolating bicontinuous network morphology in all-PSCs. We propose that the crystallization of polymer donors governs the film-forming process and dominates the phase separation morphology, leading to good phase separation morphology. The all-PSC devices all show power conversion efficiencies (PCEs) of 5.2?6.6%. This study provides a new direction to design polymer acceptors and a novel approach to control phase separation morphology of all-PSCs.
关键词： all-polymer solar cells,phase separation morphology,B←N units,amorphous polymer acceptor,power conversion efficiencies
更新于2025-09-11 14:15:04