- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A transparent and Pt-free all-carbon nanocomposite counter electrode catalyst for efficient dye sensitized solar cells
摘要： Recently, substantial focus has made in the development of cost effective Pt-free dye sensitized solar cells (DSSCs). In this article we report a potential, Pt-free, carbon based nanocomposite as counter electrode catalyst for dye sensitized solar cells. Graphene oxide (GO) was made into reduced graphene oxide (SSrGO) by irradiating with light (Xe source). Suspension of SSrGO in DMF was spray coated onto fluorine doped tin oxide (FTO) coated glass substrate, followed by spray coat of single walled carbon nanohorns (SWCNH) suspension in DMF. SSrGO and SWCNH coated FTO glass substrate was investigated as an effective Pt-free composite counter electrode (CE) for DSSC and also showed the comparable catalytic activity with Pt. The test cell reveals power conversion efficiency (PCE) of 8.27%, whereas the DSSC module exhibited a PCE of 5.18%. By using the fabricated DSSC module, an electric motor (15 mW) was operated both in indoor and outdoor light conditions. The procedures followed in this work pave a way for the easy fabrication of composite CE towards transparent DSSC modules and further the integration of the DSSC module with the standard Si solar cell is of great potential for various real-time application.
关键词： Reduced graphene oxide,Dye sensitized solar cell,Cost effective composite counter electrode,SWCNH,Transparent DSSC module
更新于2025-09-19 17:13:59
-
Highly transparent and conductive oxide-metal-oxide electrodes optimized at the percolation thickness of AgOx for transparent silicon thin-film solar cells
摘要： Highly transparent and conductive oxide-metal-oxide (OMO) electrodes comprising aluminum-doped zinc-oxide (AZO) and ultrathin Ag or oxygen (O2)-doped Ag (AgOx) metal layers were fabricated for use in thin-film silicon solar cells. The surface morphologies of the metal layers and the transparencies and conductivities of OMO electrodes were investigated near the percolation thickness values of the metal layers. The percolation metal thickness, which means the metal layer is morphologically continuous, could be used to optimize the transparent OMO electrode. Additionally, thin Ag-based OMO (AgOx OMO) with superior performance could be fabricated by adding O2. The optimized AgOx OMO electrodes yielded the highest average transmittance (Tavg) of 93.5% and the lowest average optical loss (OLavg) of 1.01% within 500–800 nm at the percolation thickness of ~6 nm, thus, maintaining low conductivity. These outcomes were superior to the responses of the percolated Ag OMO (Tavg = 87.2%; OLavg = 1.01%). Using the OMO structure at the rear electrode, transparent hydrogenated amorphous silicon thin-film solar was fabricated for building integrated photovoltaic windows. The best figure-of-merit (FOM; equal to the product of Tavg and efficiency η) values of the OMO-based transparent solar cells could be obtained for percolated OMO structures. The cells using AgOx OMO (AgOx cells) performed better than the Ag cells; the best FOMs of AgOx and Ag cells were 140.8 (Tavg = 27.8%; η = 5.51%) and 104.6% (Tavg = 18.9%; η = 5.54%), respectively. These results could contribute to the development of high-performance transparent solar cells or optoelectronic devices.
关键词： Oxygen-doped silver,Oxide/metal/oxide,Transparent conductive electrode,Transparent solar cell,Thin-film silicon solar cell
更新于2025-09-19 17:13:59
-
[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - ACS-fed Electrically Small Metamaterial Inspired Dual Polarized Antenna Enabled with Staircase Radiating Strips for UMTS/WiMAX/WLAN Applications
摘要： Real-time monitoring of cardiac health is helpful for patients with cardiovascular disease. Many telemedicine systems based on ubiquitous computing and communication techniques have been proposed for monitoring the user’s electrocardiogram (ECG) anywhere and anytime. Usually, wet electrodes are used in these telemedicine systems. However, wet electrodes require conduction gels and skin preparation that can be inconvenient and uncomfortable for users. In order to overcome this issue, a new non-contact electrode circuit was proposed and applied in developing a mobile electrocardiogram monitoring system. The proposed non-contact electrode can measure bio-potentials across thin clothing, allowing it to be embedded in a user’s normal clothing to monitor ECG in daily life. We attempted to simplify the design of these non-contact electrodes to reduce power consumption while continuing to provide good signal quality. The electrical speci?cations and the performance of monitoring arrhythmia in clinical settings were also validated to investigate the reliability of the proposed design. Experimental results show that the proposed non-contact electrode provides good signal quality for measuring ECG across thin clothes.
关键词： non-contact electrode,mobile electrocardiogram monitoring system,electrocardiogram (ECG),telemedicine,Arrhythmia
更新于2025-09-19 17:13:59
-
Bi2S3 nanoparticles densely grown on electrospun-carbon-nanofibers as low-cost counter electrode for liquid-state solar cells
摘要： Dye-sensitized solar cells (DSSCs) counter electrode (CE) is needed to have both good electrical conductivity and high catalytic activity, and composite materials are better meet these two requirements. In this work, Bi2S3/carbon nanofiber (CNFs) composites are synthesized by simple electrospinning and hydrothermal methods, and after optimization of the content of Bi2S3, the large amount Bi2S3 nanoparticles are grown densely on CNFs without agglomeration. Bi2S3/CNFs composites are first introduced into DSSCs as CE. The optimized Bi2S3/CNFs composites are of great electrochemical performance and obtain a photoelectric conversion efficiency (PCE) of 7.64 %, which is better than common used Pt CE (7.12 %). Thus Bi2S3/CNFs CE has great prospects based on low cost and simple fabrication process to develop Pt-free CEs which could accelerate the large-scale application of DSSCs.
关键词： Counter electrode,Bi2S3 nanoparticles,Carbon nanofibers,Composite,Dye-sensitized solar cells
更新于2025-09-19 17:13:59
-
Self-augmented ion blocking of sandwiched 2D/1D/2D electrode for solution processed high efficiency semitransparent perovskite solar cell
摘要： Perovskite solar cells (PSCs) have been emerged as a promising candidate for solution processable semitransparent (ST) and flexible photovoltaics. However, solution processing compatible transparent electrodes (TEs) still exist as one of the major obstacles for high efficiency and stable ST-PSCs. In this work, we constructed a sandwiched top transparent electrode by using solution processable one- and two-dimensional materials. The assembled 2D graphene with controlled reduction and 1D silver nanowires (AgNWs) electrode present significant contribution to carrier’s collection and stability of devices. A self-augmented iodine ion blocking is observed, which mitigated the corrosion of TE from water, oxygen, iodine and etc.. The stability of unencapsulated ST-PSC devices has been significantly enhanced with >80% original power conversion efficiency maintained after 320 h discontinuous tests in the ambient atmosphere, comparing to <10% for AgNWs-along devices. A high-performance single junction ST-PSC was obtained with the efficiency reached up to 14.69% with the transmittance over 20% for visible light and 59% for near infrared ray. Thus, with development the printing compatible top 2D/1D/2D TE, the performance of all-solution processed ST-PSCs could be further enhanced and possibly apply for low-cost building integrated photovoltaics, tandem and portable electronic devices.
关键词： stability,semitransparent,graphene,sandwiched electrode,2D/1D/2D
更新于2025-09-19 17:13:59
-
Study on the Stability of Unpackaged CdS/CdTe Solar Cells with Different Structures
摘要： In this work, the stability of unpackaged CdTe solar cells with di?erent con?gurations was investigated according to the International Electrotechnical Commission IEC 61215-2016. The measurements of thermal cycling from -40°C to +85°C and 24-hour temperature cycling from -40°C to +85°C were carried out in CdS/CdTe solar cells with structures of FTO/CdS/CdTe/Au, FTO/CdS/CdTe/back contact/Au, and FTO/MZO/CdS/CdTe/back contact/Au, respectively. The performances of these cells before and after the thermal aging experiments were investigated by using light and dark I‐V together with C‐V. The results reveal varied performance degradation before and after thermal aging in the cells with di?erent structures. Among these, the most deteriorated device is the one without back contact (BC), whose e?ciency decreased by 25.12% after thermal cycling accompanying an obvious roll-over phenomenon when forward bias was greater than open circuit voltage. On the contrary, the reduction in the e?ciency was about 16.80% in the case cells with BC, and the roll-over phenomenon was not so signi?cant. Furthermore, for the devices with optimized front contact of FTO/MZO, the thermal stability was improved obviously. Interestingly, short-circuit current density associated with the carrier concentration of cells remained relatively small variations compared with the change of Voc and ?ll factor. All the results indicated that an e?cient back contact layer and an optimized front electrode were the indispensable structural elements to attain high stabilization in the CdS/CdTe solar cells.
关键词： front electrode,thermal cycling,back contact,CdS/CdTe solar cells,stability
更新于2025-09-19 17:13:59
-
High performance carbon-based planar perovskite solar cells by hot-pressing approach
摘要： A simple yet effective method based on hot-pressing a free-standing carbon film onto adjacent hole transport layer (HTL) is used to fabricate carbon electrode for planar perovskite solar cells (C–PSCs). Due to the thermoplasticity of as-prepared carbon film, the conductivity of the carbon electrode is enhanced by over ten-fold and the adhesion to adjacent layer is dramatically strengthened via this hot-pressing process. By optimizing the pressing temperature, 15.3% of power conversion efficiency (PCE) is obtained for CuSCN based C–PSCs, which is 70% high than the device without heating at the same pressing pressure. The device demonstrates 93% performance retention after being stored in a humid environment (55–70%) without encapsulation over 80 days. This facile fabrication process of PSCs paves a way to facilitate commercialization of the new PV technology.
关键词： Carbon electrode,Hot-pressing,Perovskite solar cells,Conductivity,Temperature
更新于2025-09-19 17:13:59
-
Carbon-based, novel triple cation mesoscopic perovskite solar cell fabricated entirely under ambient air conditions
摘要： In the past, various reports on Perovskite Solar Cells (PSCs) have presented significant results. However, due to stability issues, scale-up drawbacks and high fabrication costs, scientists turned their focus on PSCs with a simpler structure, based on carbon electrodes. In this work, we report a carbon-based PSC, embedding a novel, triple cation perovskite, created after combining Methylammonium Iodide (MAI), 5-Aminovaleric Acid Iodide (5-AVAI) and Lead(II) Iodide (PbI2) along with Phenethylammonium Iodide (PEAI) salt. In our Hole Transport Layer (HTL) free device, the perovskite was infiltrated through the conductive porous carbon cathode layer, which is deposited on top of compact/mesoporous TiO2 (c-TiO2/mp-TiO2) and mesoporous insulating ZrO2 (mp-ZrO2) layers, with all processes being carried out under ambient conditions and high relative humidity (40-60%). Finally, the perovskite films (5-AVA)x(MA)1-xPbI3 and (5-AVA)x(PEA)x(MA)1-xPbI3+x are optically/structurally characterized and the electrical performance of the corresponding devices is examined.
关键词： Triple Cation,Mesoscopic Solar Cell,Carbon Electrode,Perovskites,Ambient Conditions
更新于2025-09-19 17:13:59
-
Transparent MoS <sub/>2</sub> /PEDOT Composite Counter Electrodes for Bifacial Dye-Sensitized Solar Cells
摘要： Dye-sensitized solar cells (DSSCs) are solar energy conversion devices with high efficiency and simple fabrication procedures. Developing transparent counter electrode (CE) materials for bifacial DSSCs can address the needs of window-transparent-type building-integrated photovoltaics (BIPVs). Herein, transparent organic?inorganic hybrid composite films of molybdenum disulfide and poly(3,4-ethylenedioxythiophene) (MoS2/PEDOT) are prepared to take full advantage of the conductivity and electrocatalytic ability of the two components. MoS2 is synthesized by hydrothermal method and spin-coated to form the MoS2 layer, and then PEDOT films are electrochemically polymerized on top of the MoS2 film to form the composite CEs. The DSSC with the optimized MoS2/PEDOT composite CE shows power conversion efficiency (PCE) of 7% under front illumination and 4.82% under back illumination. Compared with the DSSC made by the PEDOT CE and the Pt CE, the DSSC fabricated by the MoS2/PEDOT composite CE improves the PCE by 10.6% and 6.4% for front illumination, respectively. It proves that the transparent MoS2/PEDOT CE owes superior conductivity and catalytic properties, and it is an excellent candidate for bifacial DSSC in the application of BIPVs.
关键词： building-integrated photovoltaics,transparent counter electrode,MoS2/PEDOT composite,bifacial illumination,Dye-sensitized solar cells
更新于2025-09-19 17:13:59
-
Synthesis of polyaniline/electrochemically exfoliated graphene composite as counter-electrode in dye-sensitized solar cell
摘要： Polyaniline (PANI)/graphene composite is a good candidate for the counter-electrode in a Pt-free DSSC. In this study, the electrochemically exfoliated graphene (EEG) from the used-battery graphite rod was produced. DC measurement reveals that EEG has a relatively low sheet resistance of 502.72 Ω/square. EEG suspension in DMF was used as synthesis media of PANI/EEG composite using the direct mixing method. Raman spectra show that the PANI/EEG composite was successfully synthesized as indicated by the presence of their characteristic peaks. Current density-voltage (J-V) measurements show that the power conversion efficiency of PANI/EEG composite better than the PANI-based counter-electrode.
关键词： PANI/graphene composite,polyaniline,counter-electrode,Pt-free DSSC,electrochemically exfoliated graphene
更新于2025-09-19 17:13:59