- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Propeller-like acceptors with difluoride perylene diimides for organic solar cells
摘要： Perylene diimide (PDI) is one of most intensively studied non-fullerene small molecule acceptors (SMAs). By fluorination on the conjugated backbone, a new PDI with difluoride substitution on adjacent bay positions of PDI is prepared. Then, four propeller-like SMAs are obtained by linking four PDIs with an aromatic core, wherein the molecular geometry is modulated by ring fusion of the aromatic core. Further study reveals that fluorination is helpful to enhance the absorption intensity, and thus promote the current density in organic solar cells. In addition, the ring-fused strategy is able to suppress the distortion and rotation of relevant molecules. Therefore, these four acceptors exhibit significantly diversity of photovoltaic performance, wherein the acceptor FPDIF4-DTC consisting of a fused core and fluoro-substituted PDIs shows a best efficiency of 5.1%. This result implies that fluorination on PDI conjugated backbone is a successful way to construct promising SMAs.
关键词： Perylene Diimide,Fluorination,Non-fullerene acceptor,Organic solar cells
更新于2025-09-11 14:15:04
-
Processing Strategies for an Organic Photovoltaic Module with over 10% Efficiency
摘要： A large-area module (active area > 20 cm2) with a power conversion efficiency (PCE) of 10.4% (certified at 10.1%) using a non-fullerene blend was demonstrated, which is by far the highest PCE reported to date. The same module also delivers a power of ~40 mW/cm2 (PCE ~22%) under indoor lighting. Equally important, PCEs of 12%–14% were achieved for blends processed in ambient and/or without halogenated solvent.
关键词： module,halogen-free solvent,non-fullerene acceptor,ambient processing,organic photovoltaic,efficiency
更新于2025-09-11 14:15:04
-
High-Performance Organic Photodetectors by Introducing a Non-Fullerene Acceptor to Broaden Long Wavelength Detective Spectrum
摘要： We demonstrate the broadband visible organic photodetectors (OPDs) by introducing a non-fullerene acceptor of 3,9-bis(2-methylene-(3-(1,1dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3d:2,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (ITIC) into the bulk heterojunction (BHJ) based on a conventional system of poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) .The resultant OPDs exhibit a specific detectivity beyond 1012 Jones in the whole visible region ranged from 380 nm to 760 nm, and the highest detectivity reaches 2.67 × 1012 Jones at 710 nm. UV-Vis absorption spectrum, steady-state photoluminescence, atomic force microscopy, and space-charge-limited current property were applied to analyze the film characteristics of obtained OPDs. Owing to the long-wavelength absorption band of ITIC, the spectral photodetection range has been broadened effectively, and better film morphology, more effective energy transfer, and the reduced electron mobility in the active layer are responsible for the excellent photodetection capability. The proposed scheme provides a reliable strategy for implementing high-performance broadband visible OPDs.
关键词： Organic photodetectors,UV-Vis absorption,Non-fullerene acceptor,Surface morphology,Full visible light photodetection
更新于2025-09-11 14:15:04
-
17% efficiency organic photovoltaic cell with superior processability
摘要： The development of organic photoactive materials, especially the new-emerging non-fullerene electron acceptors (NFAs), has enabled rapid progress in organic photovoltaic (OPV) cells in recent years. Although the power conversion efficiencies (PCEs) of the top-performance OPV cells have surpassed 16%, the devices are usually fabricated via a spin-coating method and are not suitable for large-area production. Here, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using the scalable blade-coating processing technology. Our results suggest that the optimization of the chemical structures of the OPV materials can improve the device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.
关键词： non-fullerene acceptor,processability,power conversion efficiency,organic photovoltaic cells,scalable large-area production
更新于2025-09-11 14:15:04
-
Modulation of Three p-Type Polymers Containing a Fluorinated-Thiophene-Fused-Benzotriazole Unit To Pair with a Benzotriazole-Based Non-fullerene Acceptor for High <i>V</i> <sub/>OC</sub> Organic Solar Cells
摘要： Three 6-?uoro-thieno[2′,3′:4,5]benzo[1,2-d][1,2,3]triazole (fBTAZT) containing copolymers, named as PfBTAZT-H, PfBTAZT-F, and PfBTAZT-Cl, were employed to pair with a benzo[1,2-d][1,2,3]triazole (BTA) based non-fullerene acceptor BTA3 for the applicaition in organic solar cells (OSCs). By introducing ?uorine or chlorine atoms into the thiophene side chains on BDT units, the highest occupied molecular orbital (HOMO) energy levels of polymers shift down in sequence, and PfBTAZT-Cl shows an obvious blue-shift of absorption spectrum. PfBTAZT-F:BTA3-based OSC attains a VOC of 1.05 V, a JSC of 11.83 mA cm?2, and FF of 0.62, leading to a PCE of 7.69%, which are higher than that of PfBTAZT-H:BTA3 (VOC = 0.99 V, JSC = 11.60 mA cm?2, FF = 0.58, and PCE = 6.65%) due to its well-matched HOMO energy level, higher charge mobilities, and favorable ?lm morphology. More surprisingly, chlorinated polymer PfBTAZT-Cl obtains the highest VOC of 1.20 V and PCE of 8.00%, which is attributed to the lowest HOMO energy level, largely decreased voltage loss (ΔVloss = 0.56 V compared to 0.77 V for PfBTAZT-H:BTA3 0.71 V for PfBTAZT-F:BTA3), more complementary absorption with that of BTA3, and e?ective charge generation. Our results demonstrate that chlorination is an e?ective approach to realize a high PCE and VOC and thiophene-fused benzotriazole (BTAZT) based polymers are also good candidates for material combinations in “Same-A-Strategy” (SAS).
关键词： fluorinated-thiophene-fused-benzotriazole,PCE,non-fullerene acceptor,organic solar cells,high VOC,benzotriazole-based
更新于2025-09-11 14:15:04
-
Non-Fullerene Small Molecule Acceptors Containing Barbituric Acid End Groups for Use in High-performance OPVs
摘要： We synthesized two new bithiophene-based small molecules, TT-BBAR, and TT-OBAR, having butyl- and octyl-substituted barbituric acid (BAR) groups, respectively, via a well-known synthetic method, the Knoevenagel condensation, in high yield. These small molecules displayed solubilities and thermal stabilities sufficient for the fabricating organic photovoltaic cells (OPVs) and were designed to have relatively low molecular orbital energy levels and act as non-fullerene acceptors (NFAs) for use in OPVs upon introduction of electron-withdrawing BAR groups at both ends. For example, the LUMO and HOMO energy levels of TT-OBAR were ?3.79 and of ?5.84 eV, respectively, clearly lower than those of a polymer donor, PTB7-Th. Importantly, the small molecules featured an energy offset with PTB7-Th sufficient for achieving exciton dissociation. The optical and electrochemical properties of TT-BBAR and TT-OBAR did not depend on the alkyl chain length. Finally, OPV devices were fabricated in an inverted structure using a solvent process. The power conversion efficiency of TT-OBAR (1.34%) was found to be slightly higher than that of TT-BBAR (1.16%). The better performance and higher short-circuit current value of TT-OBAR could be explained based on a morphological AFM study, in which TT-OBAR displayed a more homogeneous morphology with a root-mean-square value of 1.18 nm compared to the morphology of TT-BBAR (11.7 nm) induced by increased alkyl chain length.
关键词： Barbituric acid,Organic photovoltaics,Organic photovoltaic cell,Non-fullerene acceptor
更新于2025-09-10 09:29:36
-
Non-Fullerene Based Printed Organic Photodiodes with High Responsivity and MHz Detection Speed
摘要： Digitally printed organic photodiodes (OPDs) are of great interest for the cost-efficient additive manufacturing of single and multi-device detection systems with full freedom of design. Recently reported high-performance non-fullerene acceptors (NFAs) can address the crucial demands of future applications in terms of high operational speed, tunable spectral response as well as device stability. Here, we present the first demonstration of inkjet and aerosol-jet printed OPDs based on the high-performance NFA, IDTBR, in combination with poly(3-hexylthiophene) (P3HT) exhibiting a spectral response up to the NIR. These digitally printed devices reach record responsivities up to 300 mA/W in the visible and NIR spectrum competing with current commercially available technologies based on Si. Furthermore, their fast dynamic response with cut-off frequencies surpassing 2 MHz outperforms most of the state-of the-art organic photodiodes. The successful process translation from spincoating to printing is highlighted by the marginal loss in performance compared to the reference devices, which reach responsivities of 400mA/W and detection speeds of more than 4 MHz. The achieved high device performance and the industrial relevance of the developed fabrication process provide NFAs with an enormous potential for the development of printed photodetection systems.
关键词： aerosol-jet printing,spectral responsivity,non-fullerene acceptor,inkjet printing,digital printing,organic photodiode
更新于2025-09-10 09:29:36
-
End-cap Group Engineering of a Small Molecule Non-Fullerene Acceptor: The Influence of Benzothiophene Dioxide
摘要： In this study, a sulfonyl-containing end-capping moiety, benzothiophene dioxide, was selected to prepare the nonfullerene acceptor ITBC. ITBC has an acceptor?donor?acceptor (A-D-A) structure, with indacenodithieno[3,2-b]thiophene (IDTT) as the electron-rich core moiety. The strong electron-withdrawing sulfonyl acceptor units leads to extended UV?vis absorption into the near-IR region and relatively low frontier molecular orbital energy levels (LUMO/HOMO: ?4.13 eV/?5.61 eV) with a narrow bandgap of 1.48 eV. These values compare favorably to the well-studied small molecule acceptor 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end-capped indacenodithieno[3,2-b]thiophene (ITIC). A power conversion e?ciency of 4.17% was achieved by fabricating organic solar cells with the ?uorinated conjugated polymer FTAZ as the donor and ITBC as the acceptor. These results indicate that benzothiophene dioxide is a novel electron-withdrawing end-capping unit for ITBC, and can be used as an electron acceptor for organic solar cells.
关键词： fused conjugated system,non-fullerene acceptor,e?cient photovoltaics,benzothiophene dioxide,organic solar cells
更新于2025-09-04 15:30:14
-
Ladder‐Type Nonacyclic Arene Bis(thieno[3,2‐b]thieno)cyclopentafluorene as A Promising Building Block for Non‐Fullerene Acceptor
摘要： A ladder-type nonacyclic arene (bis(thieno[3,2-b]thieno)cyclopentafluorene (BTTF)) has been designed and synthesized through fusing thienothiophenes with the fluorene core from the synthon of dimethyl 9,9-dioctyl-2,7-bis(thieno[3,2-b]thiophen-2-yl)fluorene-3,6-dicarboxylate. With BTTF as the central donor unit, a novel acceptor-donor-acceptor (A-D-A) type non-fullerene small molecule (BTTFIC) was prepared with 1,1-dicyanomethylene-3-indanones (IC) as the peripheral acceptor units. The energy level of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of BTTFIC locate at -5.56 and -3.95 eV, respectively, presenting a low optical band gap of 1.58 eV. Encouragingly, polymer solar cells based on the blends of BTTFIC with both the representative wide and low band gap polymer donors (PBDB-T, 1.82 eV. PTB7-Th, 1.58 eV) offer power conversion efficiencies over 8% (8.78 ± 0.18% for PBDB-T:BTTFIC and 8.18 ± 0.29% for PTB7-Th:BTTFIC). These results highlight the advantage of ladder-type BTTF on the preparation of nonfullerene acceptors with extended conjugated backbones.
关键词： Ladder-type Arene,Non-fullerene Acceptor,Bulk heterojunction,Polymer Solar Cells,Polycyclic Aromatics
更新于2025-09-04 15:30:14