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Tailorable and Flexible Conducting Films via Interfacial Modification of Polymer Fibers
摘要： Portable devices have become lightweight, flexible, and even stretchable such that skin-like electronics are widely applicable, including in biomedical devices, soft robotics, and human/machine interfaces. Rendering these devices soft and flexible is highly desirable, as this would enable them to interact seamlessly with human skin and improve their wearing comfort. We demonstrate a convenient but effective method to fabricate flexible conducting films. These films consist of electrospun polyurethane (PU) fibers as the flexible substrate onto which copper was deposited. These Cu-PU films have excellent conductivity, and their resistance only increases slightly after extensive folding, even when folded into a paper crane with a resistance of 1.8 Ω. Furthermore, Cu-PU films can sense tension strength and exhibit stable Joule electrothermal performance. The Cu-PU-based heating glove could be heated to 40 °C in 30 s by applying 2 V. The simple but effective procedure presented here is suitable to fabricate flexible conducting film and may also promote the development of portable and flexible electronic products.
关键词： flexible,polymer fiber,strain sensor,conductive,interfacial modification
更新于2025-09-23 15:22:29
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High-Efficiency Perovskite Quantum Dot Solar Cells Benefiting from a Conjugated Polymer-Quantum Dot Bulk Heterojunction Connecting Layer
摘要： In this work, we reported an efficient and universal method to fabricate perovskite quantum dot (PQD) solar cells with enhanced efficiency. Through dissolving optimal amount conjugated polymers in PQD matrix solution to fabricate a polymer-QD bulk heterojunction hybrid layer located at PQD/hole transporting layer (HTL) interfaces, the resultant solar cell devices exhibit significantly enhanced short-circuit current density and efficiency. In-depth characterizations indicate that adding optimal conjugated polymer into the PQD film can effectively reduce pin-holes, resulting in more efficient interfacial charge transfer and decreased carrier recombination loss. More importantly, it shows that the highest occupied molecular orbital (HOMO) energy level of the conjugated polymer is crucial for achieving improved carrier transport at the PQD/HTL interfaces. Through rational selection of conjugated polymers, we achieved the best power conversion efficiency of ~14% and 13.2% for CsPbI3 and FAPbI3 PQD based solar cells respectively, situating the forefront of all reported PQD solar cells. These findings would provide insights into well controlling the organic-inorganic interfaces to improve photovoltaic devices.
关键词： interfacial modification,solar cells,perovskite quantum dot,bulk heterojunction,conjugated polymer
更新于2025-09-23 15:21:01
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Understanding the mechanisms of a conjugated polymer electrolyte for interfacial modification in solution-processed organic-inorganic hybrid perovskite photodetectors
摘要： Interfacial modification is an effective strategy to suppress the dark current in photodetectors for performance improvements. Here, solution-processed conjugated polymer electrolyte poly[(9,9-bis(3’-(N,N-dimethylamino) propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)](PFN), widely used for interface engineering in organic and perovskite solar cells, is introduced to the photovoltaic photodetectors based on α-phase formamidinium lead iodide (α-FAPbI3) perovskite at cathode interfaces. The PFN layer has both positive and negative impacts on the overall device performances. The steady-state device parameters including external quantum efficiency, photoresponsivity, and detectivity are enhanced because the dark current is effectively suppressed due to the hindered hole injection by the PFN layer. However, the incorporation of PFN leads to different transient photocurrent dynamics with a peak after turn-on and a long-lived tail after turn-off, increasing the fall time, although it has little impact on the rise time. The proposed mechanisms involve the trapping and detrapping effects of accumulated photogenerated electrons at the electron-transporting layer/PFN interface, which are proved by capacitance-voltage measurements and impedance spectroscopy analysis. Our results have important significance for understanding the different effects and mechanisms of conjugated polymer electrolytes for interfacial engineering in photodetectors and solar cells and selecting suitable interfacial materials for electrode modification in photodetectors.
关键词： Conjugated polymer electrolyte,Transient photocurrent dynamics,Steady-state device parameters,α-FAPbI3 perovskite photodetectors,Interfacial modification
更新于2025-09-23 15:21:01
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2-Methylimidazole as an interlayer for the enhancement of the open-circuit voltage in perovskite solar cells
摘要： The loss of open-circuit voltage is a major obstacle for approaching the theoretical value of the power conversion efficiency in hybrid perovskite solar cells. In this study, a feasible and effective strategy for modifying the interface between the perovskite and the mesoporous TiO2 layer is proposed and implemented for the first time using 2-methylimidazole as a coating layer. As a result, the open-circuit voltage in the perovskite solar cells is significantly improved by 80 mV. The electronic impedance spectroscopy and photoluminescence spectroscopy results demonstrate that the modification of 2-methylimidazole as an interfacial insulating layer suppresses the electron transfer back from the anode electrode to the perovskite active layer, thereby inhibiting the recombination of the carriers at the interfaces, which results in an enhancement of the open-circuit voltage in the device. The cell modified with 2-methylimidazole shows increases in the open-circuit voltage from 1.05 to 1.13 V and in the power conversion efficiency from 17.48% to 19.45%. The optimal device with an area of 1 cm2 also exhibits an impressive efficiency of 16.38%.
关键词： 2-Methylimidazole,Open-circuit voltage,Efficiency,Interfacial modification,Perovskite solar cell
更新于2025-09-16 10:30:52
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Cyclooctatetrathiophene-Cored Three-Dimensional Hole Transport Material Enabling Over 19% Efficiency of Perovskite Solar Cells
摘要： In this work, a rigid three-dimensional cyclooctatetrathiophene was the core component in the construction two hole transporting materials (HTMs), COTT-1 and COTT-2. Their photophysical, electrochemical and thermal properties were systematically investigated in a combination of experimental and simulation methods. COTT-1 and COTT-2 based perovskite solar cells (PSCs) were tested, exhibiting power conversion efficiency (PCE) of 8.4% and 17.7%, respectively, which are similar to Spiro-OMeTAD-based device (18.2%) under the same conditions. PCE was further increased to 19.2% using COTT-1 as an interfacial layer and COTT-2 as HTM. These phenomena were analyzed by means of photoluminescence (PL), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and atomic force microscope experiments (AFM), which demonstrated the potential of cyclooctatetrathiophene-cored hole transport material.
关键词： power conversion efficiency,interfacial modification,thiophene,perovskite solar cells,hole transport material,three dimension
更新于2025-09-16 10:30:52
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Sol–gel ZnO modified by organic dye molecules for efficient inverted polymer solar cells
摘要： ZnO layer was modified with the addition of Cationic dyes including Crystal Violet (CV)/Ethyl violet (EV) in sol–gel process for an electron transport layer in inverted polymer solar cells (PSCs). X-ray photoelectron spectra showed the presence of CV/EV at the top of ZnO surface. Besides, oxygen defect was significantly reduced by CV/EV modification due to the chloride occupation. Furthermore, the amount of CV/EV decreased progressively from ZnO surface to bottom, being evidenced by depth profile. With modification, the ZnO surface became smoother and more hydrophobic to improve the contact with active layer. Meanwhile, CV/EV participated in the crystallization which resulted in the larger ZnO crystal grain size. Interface dipole after modification would slightly reduce the work function of ZnO and the energy barrier between ZnO and active layer via Ultraviolet Photoelectron Spectroscopy and External Quantum Efficiency analysis. Accordingly, inverted PSCs possessed better morphology, better electron extraction ability with ZnO modified by CV and EV respectively, rendering the power conversion efficiency up to 8.80% and 9.06% in comparison to the pristine ZnO (7.59%). In conclusion, we demonstrate a facile way to improve morphological and electrical properties of ZnO layer by simply adding CV/EV in sol–gel ZnO to fabricate high performance PSCs.
关键词： Interfacial modification,Cationic dye,Polymer solar cells,Electron transport,Sol–gel ZnO
更新于2025-09-12 10:27:22
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Elimination of Light-Soaking Effect in Hysteresis-Free Perovskite Solar Cells by Interfacial Modification
摘要： The hysteresis and light-soaking effect have been observed in organo-metal halide perovskite solar cells (PSCs) under operating conditions, which inhibit the precise evaluation of power output. The mechanisms leading to these effects are little understood. Here, our studies have demonstrated that the light-soaking effect is related to the electron selective layer/perovskite interface in hysteresis-free PSCs. The introduction of [6,6]-phenyl C61-butyric acid methyl ester (PC61BM) doped with CH3NH3I molecules as the interfacial layer can effectively release or eliminate this effect due to the efficient charge transfer, accompanied with the best stable output efficiency of 19% and an ultrahigh fill factor over 84%. Capacitance -voltage and capacitance -frequency curves derived from electrochemical impedance spectroscopy demonstrate that the light-soaking effect in PSCs mainly originates from the charge accumulation at the PC61BM/perovskite interface. The CH3NH3I doped in PC61BM forestalls the ion movement among the perovskite and thus eliminate the light-soaking effect. Furthermore, a model that combines ion migration and charge accumulation process to interpret the light-soaking effect and performance improvement in PSCs is proposed.
关键词： perovskite solar cells,light-soaking effect,hysteresis,charge transfer,interfacial modification
更新于2025-09-12 10:27:22