- 标题
- 摘要
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- 实验方案
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Ultrathin Fully Printed Light-Emitting Electrochemical Cells with Arbitrary Designs on Biocompatible Substrates
摘要： Organic electronic devices are often highlighted in terms of cost-efficient solution processing and potential printability. However, few studies are reporting truly full-solution-processed devices taking into account the electrodes as well as all other layers. This results in a production method that only partially benefits from the cost efficiency of solution processing and that still depends on costly and elaborate techniques like evaporation and/or lithography. This lack of knowledge is addressed by presenting a truly fully printed light-emitting electrochemical cell on ultraflexible parylene C substrates usable for conformable electronics. All device parts are fabricated by industrial relevant printing-techniques under ambient atmosphere. Inkjet printing is used for the structuring of the device layout and is therefore able to implement and create arbitrary designs. Further layers are produced by blade coating which is well suited for the coating of large areas. The devices show stable operation at a luminance higher than 100 cd m?2 for 8.8 h, can reach a maximum brightness of 918 cd m?2, and exhibit a turn-on time of 40 s to reach 100 cd m?2. Moreover, biocompatible and biodegradable materials are utilized to allow potential applications in life science and bioelectronics.
关键词： fully printed electronics,light-emitting electrochemical cells,parylene,inkjet,bioelectronics,digital printing,conformable electronics
更新于2025-09-23 15:23:52
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Digital printing of efficient dye-sensitized solar cells (DSSCs)
摘要： This study reports on the printing of TiO2 nanoparticles and the sensitization of the photoanode by a new digital printing technology, named Digital Materials Deposition “DMD” to fabricate semi-transparent DSSCs. In this study, the push-pull dye coded “D35” and I3?/I? were used respectively as sensitizer and redox mediator. The photovoltaic performances of the solar cells printed with the DMD technology were compared to those prepared by the conventional method consisting of screen-printed nanoparticles and dying process by overnight soaking of the electrode into a solution of the sensitizer. Scanning Electron Microscopy shows that the DMD printed ?lm is more porous than the one deposited by screen printing. The cells prepared by DMD give higher solar energy conversion e?ciency (Jsc = 12.65 mA/cm2, Voc = 775 mV, FF = 75%, PEC = 7.4%) than with conventional screen-printing technique (Jsc = 10.03 mA/cm2, Voc = 760 mV, FF = 72%, PEC = 5.48%). IMVS/IMPS measurements demonstrate that the superior photocurrent density delivered by DMD printed solar cells is due to a higher charge collection e?ciency. Overall, this study demonstrates that DMD technology simpli?es the DSSC fabrication process with a reduction of the material consumption and it is quick and e?cient representing an innovative and attractive method to manufacture DSSCs.
关键词： Semi-transparent,Fast fabrication process,Dye-sensitized solar cells,Digital printing
更新于2025-09-23 15:19:57
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The effect of manufacturing defects on the fatigue life of selective laser melted Ti-6Al-4V structures
摘要： The manufacturing defects introduced by selective laser melting typically lead to lower fatigue strength and a larger variation in fatigue life compared to conventionally manufactured structures. X-ray micro computed tomography (μCT) is used to characterize the porosity and lack of fusion defects in terms of population, morphology, dimension and location. The defect size and location are combined with the NASA/FLACGRO (NASGRO) fatigue crack growth model to predict the likely fatigue life, in which an effective initial crack length is defined using the cyclic plastic zone and the defect radius. An eXtended defect zone (XDZ) describing the propensity for local plasticity during fatigue around a defect has been shown through numerical analysis to be a good indicator of the ranking of the threat to fatigue caused by differently located manufacturing defects. This indicates that the effect of a defect, initial radius, r0, is likely to be pronounced when its center is within 2r0 of the surface and maximal when it lies just beneath the surface.
关键词： Additive manufacturing,High cycle fatigue (HCF),Fatigue crack initiation and growth,Digital printing,Defect tolerance method
更新于2025-09-23 15:19:57
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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
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[IEEE 2018 13th International Congress Molded Interconnect Devices (MID) - Würzburg, Germany (2018.9.25-2018.9.26)] 2018 13th International Congress Molded Interconnect Devices (MID) - Low-Temperature Sintering of Nanometal Inks on Polymer Substrates
摘要： Digital non-contact-printing technologies such as inkjet or Aerosol Jet are becoming more and more interesting for the manufacturing of electronic components due to their benefits such as easy variation of printing layouts, short process chains without masks, large variety of usable substrates and inks - frequently based on nano metals - and a certain 3D capability. In this contribution options are discussed to sinter nano metal inks such as Ag, Au, and CuNi inks at low temperature, thus enabling the use of temperature sensitive polymer substrates like PC, PS, or PMMA. This includes the addition of chemical agents as well as light-based sintering methods such as photonic curing or laser sintering. Finally some application examples are presented.
关键词： Digital printing,laser sintering,photonic curing,low-temperature sintering,nano metal inks
更新于2025-09-09 09:28:46