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Electrical property modified hole transport layer (PEDOT:PSS) enhance the efficiency of perovskite solar cells: hybrid co-solvent post-treatment
摘要： Poly(3,4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) layer as a hole transport layer (HTL) plays a key role in efficient hole extraction and transportation of the inverted planar perovskite solar cells (PSCs). However, the insulating nature of PSS lead to lower electrical property of the PEDOT:PSS film, which impedes transferring hole and results in a low photocurrent of the PSCs. In this work, dimethylformamide (DMF), methanol and their mixture solvents (co-solvent) were employed to treat the PEOT:PSS thin film after deposition with different methods to enhance the film’s electrical conductivity. Electrical conductivity of the PEDOT:PSS films was increased from 10-3 S.cm-1 to ~102 S.cm-1 after the co-solvents treatment. Using the highest conductivity co-solvent treated PEDOT:PSS thin film as the HTL in a perovskite solar cell, the power conversion efficiency (PCE) of the device has been measured improved by 17.5% as compared with that of the control device with the untreated PEDOT:PSS film as the HTL. This result shows that the hybrid co-solvent post-treatment is a simple and feasible way to modified the electrical properties of the PEDOT:PSS film as the HTL for high efficient PSCs and other thin film electronic and optoelectronic devices.
关键词： Perovskite solar cells,PEDOT:PSS,Hole transporting layer,Solvent treatment,Conductivity
更新于2025-09-12 10:27:22
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Pre-crystallisation applied in sequential deposition approaches to improve the photovoltaic performance of perovskite solar cells
摘要： The fabrication process for perovskite films is critical for their microstructure and photo-electrical properties. In this study, a pre-preparation step for perovskite crystal particles with a conventional two step spin-coating method was introduced for improving the quality of the prepared perovskite films. By adding CH3NH3I into the PbI2 precursor solution and performing anti-solvent extraction during the preparation process, a small amount of perovskite crystal particles was produced in the PbI2 layers. We demonstrated that the pre-preparation of perovskite crystal particles enhanced the grain size and coverage of the perovskite films due to modification of the surface morphology and crystallisation of the PbI2 layers. Furthermore, after optimisation, the crystal size in the perovskite films reached almost 3 μm, which tremendously enhanced the generation and transportation of photo-generated carriers in photo-voltaic devices. Under illumination, the fill factor (FF) and short circuit current density (Jsc) of the corresponding devices increased, and the photoelectric conversion efficiency (PCE) was enhanced from 11.7% to 17.5%. Further, the stability of the devices in dark humid air was improved. Our results demonstrate that pre-preparing the perovskite crystal particles is useful for the fabrication of high-quality perovskite films. This approach can also be applied to devices based on perovskite films with other compositions.
关键词： Solvent engineering,sequential,solar cells,Crystallization,perovskite,deposition
更新于2025-09-12 10:27:22
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Perylene Diimide based Organic Photovoltaics with Slot-Die Coated Active Layers from Halogen-Free Solvents in Air at Room Temperature
摘要： Herein, we investigate the role of processing solvent additives on the formation of polymer-perylene diimide bulk-heterojunction active layers for organic photovoltaics using both spin-coating and slot-die coating methods. We compare the effect of 1,8-diiodooctane (DIO) and diphenyl ether (DPE) as solvent additives on the aggregation behavior of the non-fullerene acceptor tPDI2N-EH in neat films and blended films with the benzodithiophene-quinoxaline (BDT-QX, QX-3) donor polymer, processed from toluene in air. DIO-processing crystallizes the tPDI2N-EH acceptor and leads to decreased solar cell performance. DPE-processing has a more subtle effect on the bulk-heterojunction morphology and leads to improved solar cell performance. Comparing spin vs. slot-die coating methods, the effect of DPE is prominent for slot-die coated active layers. While similar device power conversion efficiencies are achieved with active layers coated with both methods (ca. 7.3% vs. 6.5%), the use of DPE improves film quality when the slot-die coating method is employed.
关键词： Organic photovoltaics,Halogen-free processing,Perylene diimide,Slot-die coating,Solvent additive,Diphenyl ether,Quinoxaline,Morphology control
更新于2025-09-12 10:27:22
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Quinonoid Zwitterion: an Amphiphilic Cathode Interlayer with Initial Thickness-Insensitive and Self-Organizing Properties for Inverted Polymer Solar Cells
摘要： Orthogonal solvent processability is generally considered one of the key requirements for an efficient interfacial material. Here we showed that in inverted polymer solar cells (PSCs), solvent orthogonality is not required for an effective and reliable cathode interlayer. A quinonoid zwitterionic molecule with amphiphilic property (dissolved in both methanol and o-dichlorobenzene (o-DCB)) named ZW-Bu was first applied as the cathode interlayer in the inverted PSCs. For three different photoactive systems, the devices with ZW-Bu CBL exhibited better performance than those with commonly used ZnO CBL. Most importantly, the device efficiency was fairly insensitive to the initial thickness of ZW-Bu. In addition, due to the high surface energy of ZW-Bu film, it was successfully used as self-organized CBL in P3HT:PC61BM system, yielding a desirable efficiency compared to the PSCs fabricated via layer-by-layer deposition method.
关键词： polymer solar cells,non-orthogonal solvent,self-organization,quinonoid zwitterion,initial thickness-insensitivity
更新于2025-09-12 10:27:22
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Water, a green solvent for fabrication of high quality CsPbBr3 films for efficient solar cells
摘要： Water has been labeled as a devil in fabrication and stability of perovskite solar cells. The inherent cognition impels researchers to prepare perovskite films in water-controlled conditions. Herein, water is used as a green solvent to prepare CsPbBr3 films through a two-step spin-coating method. Due to the high solubility of CsBr but low solubility of PbBr2 in water, it provides a possibility to deposit CsBr onto PbBr2 from water solution without destroying the film. Here, high quality CsPbBr3 films are fabricated by spin-coating concentrated CsBr/H2O solution onto the PbBr2 film followed by annealing. As a result, the solar cells basing on a configuration of FTO/TiO2/CsPbBr3/Carbon exhibit a power conversion efficiency of 6.12%. This work provides a simple and easy way to prepare high quality CsPbBr3 films for efficient solar cells. It makes a solid step towards to reducing the solvent toxicity in the fabrication process of perovskite solar cells. It also breaks the forbidden zone for fabricating perovskite films from water, and updates the inherent understanding of water in the research of perovskite solar cells.
关键词： CsPbBr3 film,two-step method,solar cell,green solvent,perovskite
更新于2025-09-12 10:27:22
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Surface Engineering of MoS <sub/>2</sub> via Laser‐Induced Exfoliation in Protic Solvents
摘要： With excellent performance in the hydrogen evolution reaction (HER), molybdenum disulfide (MoS2) is considered a promising nonprecious candidate to substitute Pt-based catalysts. Herein, pulsed laser irradiation in liquid is used to realize one-step exfoliation of bulk 2H-MoS2 to ultrastable few-layer MoS2 nanosheets. Such prepared MoS2 nanosheets are rich in S vacancies and metallic 1T phase, which significantly contribute to the boosted catalytic HER activity. Protic solvents play a pivotal role in the production of S vacancies and 2H-to-1T phase transition under laser irradiation. MoS2 exfoliated in an optimal solvent of formic acid exhibits outstanding HER activity with an overpotential of 180 mV at 10 mA cm?2 and Tafel slope of 54 mV dec?1.
关键词： molybdenum disulfide,sulfur vacancy,solvent effect,phase transition,laser exfoliation in liquid
更新于2025-09-11 14:15:04
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Eco-friendly and stable silver bismuth disulphide quantum dot solar cells via methyl acetate purification and modified ligand exchange
摘要： From the point of view of environmentally-friendly, non- or less toxic photovoltaic material and fabrication method are desired by both the academia and industrial community. However, most efficient quantum dot solar cells have been fabricated based on heavy metal and toxic solvent consumption, which could cause serious ecological problems. Quantum dot solar cells were studied and explored based on lead-free active material silver bismuth disulphide, less toxic solvent purification of methyl acetate and lab-developed ligand exchange process. Twice ligand exchanges with tetramethylammonium iodide were applied for every deposited quantum dot layer kept in static. Methanol rinse was applied to the quantum dot film after each ligand exchange process to promote the ligand exchange and clean the organic residuals. Decent power conversion efficiency and good stability were demonstrated for the fabricated silver bismuth disulphide quantum dot solar cells. The best power conversion efficiency of 4.57% was achieved, with open-circuit voltage of 0.445 V, short-circuit current of 18.87 mA/cm2 and fill factor of 54.4%. Over 95% of the original power conversion efficiency was maintained after 150 days both in N2-filled glove box and ambient atmosphere with relative humidity of 30%. This work demonstrated fabrication of quantum dot solar cells based on non- or less-toxic quantum dots and solvent consumption. Which would benefit the development and commercialization of quantum dot solar cell technology.
关键词： low-toxic solvent,silver bismuth disulphide,performance,eco-friendly solar cell,Lead-free quantum dots,ligand exchange
更新于2025-09-11 14:15:04
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[IEEE 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - Kyoto, Japan (2019.7.2-2019.7.5)] 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - PEDOT:PSS Transparent Electrode for ITO-Free Polymer:Fullerene Bulk-Heterojunction Organic Solar Cells
摘要： Conducting poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films have high potential as flexible transparent conductive electrodes in various devices. In this study, two simple robust methanol-based treatment methods, namely, dipping process (DP) and solvent vapor annealing (SVA), were used to improve the electrical conductivity of PEDOT:PSS films in order to make them suitable as electrodes in organic solar cells (OSCs). Then, the characteristics of the methanol-treated PEDOT:PSS films were investigated. After the methanol treatments, the sheet resistance of the PEDOT:PSS films (ca. 100 ?/Sq) were improved by more than 200 times, and the work function (~5.0 eV) was nearly unchanged in both methods. Two completely different possible origins of the improved conductivity of the methanol-treated PEDOT:PSS films were addressed for DP and SVA approaches. Both methods were suitable for preparing methanol-treated PEDOT:PSS films that can be used as anodes for polymer–fullerene-based OSCs. The photovoltaic performance of the modified PEDOT:PSS-based devices was comparable to that of indium tin oxide (ITO)-based devices, thus demonstrating their practicality. The methanol-treated PEDOT:PSS films show great potential as flexible transparent conductive electrodes for ITO-free and metal-free devices.
关键词： dipping process,solvent vapor annealing,organic solar cells,methanol treatment,transparent electrode,PEDOT:PSS
更新于2025-09-11 14:15:04
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31.1: <i>Invited Paper:</i> Systematic Design of Jettable Inks for Printed O/Pled
摘要： Inkjet printing represents an accurate and non-contact printing technique which has been widely investigated as a valuable tool in the preparation of organic light emitting diodes (OLED). The working principle of inkjet printing is to eject inks from nozzles with a diameter of 10-100 μm to a specified position on a treated substrate, and then the deposited ink is dried to evaporate the solvent to form the thin film with a predesigned pattern. Comparing with the conventional solution processing technologies, such as spin coating, gravure printing and screen printing, inkjet printing exhibits the merits of being mask-free, material saving, pattern replacing easily and compatible with flexible plastic substrates, which is promising for the significant technology of large-scale, low-cost, and flexible displays based on OLED.
关键词： TADF polymer,PLED,solvent system,Inkjet printing,OLED
更新于2025-09-11 14:15:04
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Solvent influence on the surface morphology of P3HT thin films revealed by photoemission electron microscopy
摘要： Only rigorous understanding of the relationship between the nano-scale morphology of organic thin films and the performance of the devices built from them will ultimately lead to design rules that can guide a structured development on the field of organic electronics. Despite great effort, unraveling the nanoscale structure of the films is still a challenge in itself. Here we demonstrate that photoemission electron microscopy can provide valuable insights into the chain orientation, domains size and grain boundary characteristics of P3HT films spun cast from different solvents at room as well as at elevated temperatures.
关键词： surface morphology,photoemission electron microscopy,organic electronics,solvent influence,P3HT
更新于2025-09-11 14:15:04