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- 2018
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- Optoelectronic Information Science and Engineering
- South China Normal University
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Efficient Low-Cost All-Flexible Microcavity Semitransparent Polymer Solar Cells Enabled by Polymer Flexible One-Dimensional Photonic Crystals
摘要： High-efficiency low-cost all-flexible microcavity semitransparent polymer solar cells (STPSCs) are comparatively studied in both fullerene- and nonfullerene-based systems with the structure strategy employing polymer flexible one-dimensional photonic crystals (F-1DPCs), as well as ITO-free UV/ozone plasma-treated polymer/ultrathin metal and PEDOT:PSS transparent electrodes. Based on the reasonable optimization of electrical and optical characteristics in device, the maximum power conversion efficiency with the use of polymer F-1DPCs can be greatly improved by 24~27% compared to the respective control devices. The improvement in JSC is comprehensively discussed, which is mainly ascribed to the enhancement of effective photon absorption in device. Although color tunability of fullerene and nonfullerene all-flexible STPSCs can be easily achieved with the use of different photonic bandgaps of polymer F-1DPCs, the CIE coordinates of nonfullerene STPSCs differ a lot from the original light source compared to the fullerene ones due to a high absorption coefficient in a narrow wavelength region. This work presents an easy and effective microcavity device strategy incorporated with different elements and demonstrates a new sketch of structure-absorption-performance relationships for fullerene- versus nonfullerene-based all-flexible STPSCs, which is compatible with low-cost roll-to-roll manufacturing and surely has a diversity of potential applications to better meet specific needs.
关键词： all-flexible,polymer solar cell,semitransparent,polymer flexible one-dimensional photonic crystals,microcavity
更新于2025-09-19 17:13:59
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Thin Dielectric Layer Enabled Low Voltage Operation of Fully Printed Flexible Carbon Nanotube Thin Film Transistors
摘要： Quality of printable dielectric layer has become one of the major obstacles to achieve high performance fully printed transistors. A thick dielectric layer will require high gate voltage to switch on and off the transistors, which will cause high power dissipation in printed devices. In response to this challenge, fully printed carbon nanotube (CNT) based thin film transistors (TFTs) have been fabricated on flexible membranes such as polyimide and liquid crystal polymer using aerosol jet printing (AJP). These devices can be operated at bias voltages below ±10 V (drain/gate voltages around ±6 V). It is much smaller than the previously reported values for fully printed CNT-TFTs using xdi-dcs (mixture of poly(vinylphenol)/poly (methylsilsesquioxane)) as dielectric and using a single printing method. This is enabled because of thin dielectric layer (~300 nm) and good uniformity in printed CNT network. The printed CNT-TFTs show on/off ratio > 105, and mobility > 5 cm2V-1s-1. Layer-by-layer deposition of CNT allows highly uniform and dense network formation, and the optimization of the xdi-dcs concentration using natural butyl alcohol provides a high-yield printing of a thin dielectric layer. Collectively, this work shows a potential of using fully printed CNT-TFTs in various flexible electronic applications such as wearable sensors, actuators, artificial skins, displays and wireless tags and antennas.
关键词： xdi-dcs,aerosol jet printing,printed dielectric,flexible electronics,fully printed thin film transistors,carbon nanotube network
更新于2025-09-19 17:13:59
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[IEEE 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Bengaluru, India (2018.12.17-2018.12.19)] 2018 4th IEEE International Conference on Emerging Electronics (ICEE) - Flexural and bending fatigue studies of perovskite solar cells on Willow Glass substrates
摘要： Perovskite based photovoltaic (PV) devices have gained enormous importance due to their high power conversion efficiencies and ease of fabrication (solution processing). Conventionally, flexible solar cells have been reported on substrates like PET and PEN. Corning? Willow? Glass, owing to its superior processability and oxygen and moisture barrier property, is a potential replacement for these substrates. In this work, devices fabricated on Willow Glass substrates have been subjected to bending and fatigue tests to assess their worthiness as substrates for flexible solar cells.
关键词： Willow Glass,photovoltaic,flexible,perovskite
更新于2025-09-19 17:13:59
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Rational design of highly efficient flexible and transparent p-type composite electrode based on single-walled carbon nanotubes
摘要： Transparent electrodes are of great importance in electronics and energy technologies. At present, transparent conductive oxides are mainly n-type conductors dominating the market and have restricted the technological advancements. Single-walled carbon nanotubes (SWCNTs) have recently emerged as promising p-type transparent conductor owing to their superior hole mobility, conductivity, transparency, flexibility and possibility to tune the work function. Here, we develop a novel rational design of p-type flexible transparent conductive film (TCF) based on SWCNTs combined with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), molybdenum oxide and SWCNT fibers. In a configuration of SWCNTs-MoO3-PEDOT:PSS/SWCNT fibers, we achieved a record equivalent sheet resistance of 17 ?/sq with a transmittance of 90% at 550 nm and a high degree of flexibility. We demonstrate that our solar cells developed on the basis of the proposed electrode and hydrogenated amorphous silicon (a-Si:H) yield an outstanding short-circuit current density of Jsc = 15.03 mA/cm2 and a record power conversion efficiency of PCE = 8.8% for SWCNTs/a-Si:H hybrid solar cells. We anticipate that this novel rationally designed p-type TCF opens a new avenue in widespread energy technologies, where high hole conductivity and transparency of the material are prerequisites for their successful implementation.
关键词： Transparent p-type electrode,flexible,composite,single-walled carbon nanotubes,hybrid thin film solar cells
更新于2025-09-19 17:13:59
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Electricity-triggered Self-healing of Conductive and Thermostable Vitrimer Enabled by Paving Aligned Carbon Nanotubes
摘要： Electrically conducting films are important for the development of modern electronics. However, most of these conducting films become susceptible to structure fractures under the complex deformations or accidental damages, causing the devices to fail to work. Inspired by the self-healing capability of creatures, we developed a self-healing, thermostable, and electrically conducting film that can be healed by electricity by paving aligned carbon nanotube (CNT) sheets onto the surface of liquid-crystal elastomer composite films. The aligned CNT sheets make the composites conductive, so the composites can be healed not only by light, but also by electricity after breaking. The scratches on the self-healing film can be healed easily under a voltage of 1.18 V/mm because of the electro-thermal effect of aligned CNT sheets. The healed film has almost the same mechanical properties compared to the pristine sample. The electrical and mechanical self-heal of the film is derived from the electrical reconnection of carbon nanotubes and transesterification-induced topology change of the network, respectively. We further demonstrated soft actuators and high-performance supercapacitors based on the prepared self-healing conducting films. This method for preparing self-healing conducting films enables the development of self-healing electronics.
关键词： electro-thermal effect,soft actuator,self-healing conducting film,flexible electronics,carbon nanotube sheet
更新于2025-09-19 17:13:59
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Flexible solar blind Ga2O3 ultraviolet photodetectors with high responsivity and photo-to-dark current ratio
摘要： In this work, flexible solar blind Ga2O3 ultraviolet photodetectors with high responsivity and photo-to-dark current ratio are demonstrated. The Ga2O3 films are obtained by the RF magnetron sputtering method on flexible polyimide (PI) substrates and the results demonstrate that all the films grown under various temperatures are amorphous. When the incident light wavelength is less than 254 nm, the incident light is effectively absorbed by the Ga2O3 film. By controlling the growth temperature of the material, the responsivity and photo-to-dark current ratio of the corresponding metal-semiconductor-metal photodetectors are significantly improved. At growth temperature of 200 oC, the current under 254 nm illumination obtains 396 nA at voltage of 20 V (corresponding responsivity is 52.6 A/W), the photo-to-dark current ratio is more than 105, and the external quantum efficiency reaches 2.6×10 4 %, which is among the best reported Ga2O3 ultraviolet photodetectors including the devices on the rigid substrates. After the bending and fatigue tests, the flexible detectors have negligible performance degradation, showing excellent mechanical and electrical stability.
关键词： solar blind photodetector,responsivity,photo-to-dark current ratio,Ga2O3,flexible device
更新于2025-09-19 17:13:59
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Performance of photovoltaic canarian greenhouse: A comparison study between summer and winter seasons
摘要： A large-scale use of the renewable energy in agriculture has become an optimal way to successfully deal with the issues of sustainability and climate change. Recently, the integration of solar panels on the roof of the greenhouse gave birth to a new crop production system called photovoltaic greenhouse. In this paper, we investigated the shading effect of the flexible photovoltaic panels, mounted on the greenhouse roof area in the checkerboard format, on the microclimate and the tomatoes yield during the summer and winter period. This study was undertaken in a two tomato canarian greenhouses, typical of the south Mediterranean region. The results of our study showed that the photovoltaic panels covering 40% roof area of the canary type greenhouse does not have a significant effect on the climatic parameters. Additionally, during the hot period, the photovoltaic panels reduced the temperature inside the greenhouse and sometimes falling in the optimum range for the tomatoes growth. Furthermore, this occupancy rate of the photovoltaic panels does not have a significant effect on the overall yield of tomatoes.
关键词： Shading,Flexible photovoltaic panels,South Mediterranean area,Tomatoes,Renewable energy,Microclimate
更新于2025-09-19 17:13:59
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Flexible high-efficiency CZTSSe solar cells on diverse flexible substrates via an adhesive-bonding transfer method
摘要： Cu2ZnSn(S,Se)4 (CZTSSe) thin-film solar cells are showing great promise due to using earth-abundant and non-toxic materials and tuning the bandgap through the amount of S and Se. Flexible high-efficiency CZTSSe solar cells are one of the outstanding research challenges because they currently require the use of thick glass substrates due to the high-temperature heat treatment process, and for this reason, few flexible CZTSSe solar cells have been reported. Furthermore, most researchers have used thin glass and metal substrates with little flexibility; the power conversion efficiency (PCE or ?) values of the solar cells made with them have been somewhat lower. To overcome these hurdles, we transferred high-efficiency CZTSSe solar cells formed on a soda-lime glass substrate to flexible substrates via an adhesive-bonding transfer method. Via this method, we were able to achieve the PCE of 5.8 to 7.1% on completely flexible substrates such as cloth, paper, and polyethylene terephthalate (PET). In particular, we were able to produce a CZTSSe solar cell on a PET substrate with a PCE of 7.1%, which is the highest among fully-flexible CZTSSe solar cells currently known to us. In addition, we deeply analyzed the PCE degradation of the flexible CZTSSe solar cell fabricated by the transfer method through a panoramic focused ion-beam image and nanoindentation. From the results of our work, we provide an insight into the possibility of making flexible high-efficiency CZTSSe solar cells using our transfer method.
关键词： thin-film solar cell,transfer method,polyethylene terephthalate (PET),Cu2ZnSn(S,Se)4 (CZTSSe),diverse flexible substrates
更新于2025-09-19 17:13:59
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Facile Fabrication of Semiconducting Single-Walled Carbon Nanotubes Patterns on Flexible Substrate Based on a Photoimmobilization Technique
摘要： Single-walled carbon nanotubes (SWCNTs) have attracted significant attention due to their outstanding properties. For their wide applications in electronics and optoelectronics, pure semiconducting SWCNTs (s-SWCNTs) and their precise placement are preconditions. Recent advances have focused on developing effective strategies to separate s-SWCNTs from raw SWCNTs, a mixture of metallic and semiconducting SWCNTs, and deposit s-SWCNTs on target substrates. Herein, a polyfluorene-based alternative copolymer (PFBP) containing benzophenone group was employed. PFBP achieved higher yield for s-SWCNTs than the well-studied poly(9,9-dioctylfluore) (PFO) through solution process. Subsequently, the dispersed s-SWCNTs were immobilized on a flexible polyethylene terephthalate (PET) in a facile manner by photoreactive benzophenone group upon exposure to UV irradiation and chemically robust patterns were fabricated from micro to macro scales through photomasks. Our method accomplished by utilizing photoimmobilization is a simple cleaning procedure and an important step forward in pitch scaling for further applications of conjugated polymer wrapped s-SWCNTs.
关键词： nanotubes,photoimmobilization,semiconducting,pattern,carbon,polyfluorene,flexible substrate,single-walled
更新于2025-09-19 17:13:59
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Thermal Degradation Related to the PEDOT:PSS Hole Transport Layer and Back Electrode of the Flexible Inverted Organic Photovoltaic Module
摘要： The hole transport layer (HTL) and back electrode play a significant role in the stability of the flexible organic photovoltaic (OPV) module. In particular, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), a widely used hole transport material, is known to be associated with many degrading factors in the OPV field. This study highlights the impact of the PEDOT:PSS layer on thermal stability using a thermal accelerating test of flexible OPV modules with inverted structures of indium tin oxide/ZnO/photoactive layer/PEDOT:PSS/Ag. The results confirm that thermal degradation of the OPV devices depends on heat temperature, in which the OPV performance degrades by a notable decrease in the open-circuit voltage (Voc) as the temperature increases from 65 °C to 85 °C. Moreover, the stability of the Voc is enhanced when the PEDOT:PSS is thicker and contains polar solvent DMSO as an additive, suggesting that the thermal degradation can correlate with the properties of the PEDOT:PSS layer. In addition, microscope images of the active layers show that the surface damage is attributed to a residual solvent of printed Ag electrode, thereby resulting in a thermally-induced drop in the short circuit current density (Jsc). More detailed descriptions are presented in this paper, and the results are expected to offer comprehensive understanding of the thermal degradation mechanism of OPV module.
关键词： flexible OPV modules,PEDOT:PSS,hole transport layer,organic photovoltaics,thermal degradation
更新于2025-09-19 17:13:59