- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
SnO <sub/>2</sub> ‐CNT Hybrid Electron Transport Layer for Efficient and Hysteresis‐Free Planar Perovskite Solar Cells
摘要： Tin oxide (SnO2) recently has received increasing attention as an electron transport layer (ETL) of planar perovskite solar cells and is considered as a possible alternative to titanium oxide (TiO2). However, planar devices based on pure solution-processed SnO2 ETL still have hysteresis, which greatly limits the application of SnO2 in high-efficiency solar cells. In order to address this issue, here, we fabricate a hybrid ETL of SnO2 and carbon nanotubes (CNTs) by a simple thermal decomposing of a mixed solution of the SnCl4·5H2O and pre-treated CNTs (termed as SnO2-CNT). The addition of CNTs can significantly improve the conductivity of SnO2 films and reduce the trap-state density of SnO2 films, which benefit to carrier transfer from the perovskite layer to the cathode. As a result, a high efficiency of 20.33% has been achieved in the hysteresis-free perovskite solar cells based on SnO2-CNT ETL, which shows 13.58% enhancement compared to the conventional device (PCE=17.90%).
关键词： SnO2,carbon nanotubes,electron transport layer,perovskite solar cells
更新于2025-09-19 17:13:59
-
Ozone-mediated Controllable Hydrolysis for High Quality Amorphous NbO <sub/>x</sub> Electron Transport Layer in Efficient Perovskite Solar Cells
摘要： Amorphous NbOx electron transport layer (ETL) shows great potential for boosting the power conversion efficiency (PCE) of perovskite solar cells (PSCs) at low temperature (< 100 °C). To date, it is still a challenge to simultaneously control the hydrolysis of NbOx precursor solution and reduce the impurities of NbOx ETLs during low-temperature solution processing under ambient conditions. Herein, for the first time, we report ozone (O3) as a strong ligand to stabilize Nb salt solution under ambient conditions. The above procedure not only provides the formation of a highly repeatable amorphous NbOx film by suppressing the hydrolysis of the solution but also reduces the OH content in the film, which decreases the defect intensity and improves the conductivity of the NbOx ETL. Thus, the formation of highly repeatable NbOx ETL-based PSCs are obtained; moreover, these PSCs have high PCE of 19.54% and 16.42% on rigid and flexible substrate, respectively, much higher than the devices based on ETLs from a solution without an O3 treatment.
关键词： NbOx,electron transport layer,perovskite solar cell,amorphous oxide semiconductors,low temperature
更新于2025-09-19 17:13:59
-
Highly efficient planar heterojunction perovskite solar cells with sequentially dip-coated deposited perovskite layers from a non-halide aqueous lead precursor
摘要： High-performance planar heterojunction (PHJ) perovskite solar cells (PrSCs) with MAPbI3 perovskite films were fabricated using a facile, environmentally benign, efficient and low-cost dip-coating deposition approach on a bilayered ZnO/TiO2 electron transport system from aqueous non-halide Pb(NO3)2. Outstanding performance of PrSCs was achieved due to the PHJ configuration of FTO/TiO2/ZnO/MAPbI3/spiro-OMeTAD/MoO3/Ag. These PHJ PrSCs exhibited better performance and stability with thinner ZnO layers in contrast to those with mesoporous TiO2 scaffolds, indicating that the thickness of the ZnO layer in the PHJ architecture significantly affected the surface coverage, morphology, crystallinity, and stability of the MAPbI3 perovskite films processed by dip-coating deposition.
关键词： ZnO/TiO2 electron transport system,perovskite solar cells,planar heterojunction,dip-coating deposition,aqueous non-halide Pb(NO3)2
更新于2025-09-19 17:13:59
-
Record Photocurrent Density over 26a??mAa??cm <sup>a??2</sup> in Planar Perovskite Solar Cells Enabled by Antireflective Cascaded Electron Transport Layer
摘要： Here an antireflective cascaded SnO2/TiO2-Cl electron transport layer (ETL) is devised to enhance the performance of planar perovskite solar cells (PSCs). The primary optical reflection of planar PSCs at the front side can be dramatically reduced by using cascaded ETL. Based on this strategy, we achieved a record-high short-circuit current density of 26.1 mA cm-2 and a high PCE of 22.9% in FAPbI3-based planar PSCs.
关键词： planar perovskite solar cells,cascaded electron transport layers,anti-reflection,bilayer,short-circuit current density
更新于2025-09-19 17:13:59
-
Hybrid Fullerene-Based Electron Transport Layers Improving the Thermal Stability of Perovskite Solar Cells
摘要： The structure-dependent thermal stability of fullerene electron transport layers (ETLs) and its impact on device stability have been underrated for years. Based on co-crystallographic understanding, herein, we develop a thermal stable ETL comprising of a hybrid layer of [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM) and [6, 6]-phenyl-C61-propylbenzene (PCPB). By tuning the weight ratios of PCBM and PCPB to influence the non-covalent intermolecular interactions and packing of fullerene derivatives, we obtained a champion device based on the 20PCPB (20 wt% addition of PCPB into the mixture of PCBM: PCPB) ETL and excellent thermal stability of 500 h under 85 °C thermal aging in N2 atmosphere in the dark. The present work exemplifies that co-crystallography can be a precise tool to probe interaction and aggregation of fullerene derivatives in ETLs, and mixed fullerene derivatives can be sought as promising ETLs to enhance the long-term stability of PSCs under high-temperature working environment.
关键词： fullerenes,electron transport layer,co-crystals,Perovskite solar cells,thermal stability
更新于2025-09-19 17:13:59
-
Molecular engineering of an electron-transport triarylphosphine oxide-triazine conjugate toward high-performance phosphorescent organic light-emitting diodes with remarkable stability
摘要： Organic electron-transport materials are an essential component to boost performances and stability of organic light-emitting diodes. We present a robust organic electron-transport compound 3-(6-(3-(4,6-bis(4-biphenylyl)-1,3,5-triazin-2-yl)phenyl)pyridin-2-yl)phenyldiphenylphosphine oxide by facilely coupling the triphenylphosphine oxide moiety to the 2-phenyl-4,6-bis(4-biphenylyl)-1,3,5-triazine unit via a 2,6-pyridinylene linker. It is well soluble in weakly polar solvents and possesses a high Tg of 123 °C with an exceptional Td≈470 °C at 1% weight loss and deep HOMO/LUMO levels of ca. ?6.45/?3.06 eV. The phosphorescent spectrum measured in solid state at 77 K reveals a notable triplet energy of 2.88 eV. n-Doping with 8-hydroxyquinolatolithium (Liq) produces the electron mobility value of 4.66×10?5–3.21×10?4 cm2 V?1 s?1@(2–5)×105 V cm?1. Moreover, the contrasting solubility of the bromo reaction intermediate and the new compound in alcoholic solvents facilitates separation. The characterizations of bottom- and top-emission green phosphorescent OLEDs involving this single Liq-doped electron-transport layer reveal long stability. In particular, the latter provides outstanding performances with 77.4 cd A–1 (corresponding to an EQE of 18.7%) and 86.8 lm W–1@ca. 1000 cd m?2, based on the green emitter bis(2-phenylpyridine)(2-(4-methyl-3-phenylphenyl)pyridine)iridium(III). Moreover, driven by a constant current for ca. 640 h, the initial luminance of 1000 cd m–2 appears almost no decay.
关键词： halogen impurities,heterocycles,electron-transport materials,lifetime,phosphine oxides
更新于2025-09-19 17:13:59
-
More Than 9% Efficient ZnSeTe Quantum Dot-Based Blue Electroluminescent Devices
摘要： We explore both synthesis of Cd-free blue quantum dots (QDs) with high-quality photoluminescence (PL) characteristics and fabrication of high-efficiency QD-light-emitting diodes (QLEDs). True blue (445 nm)-emissive, multishelled ZnSeTe QDs with a high PL quantum yield of 84% and sharp bandwidth of 27 nm are prepared. To obtain a better electron transport layer (ETL) material, surface of ZnMgO nanoparticles (NPs) is modified by additional Mg reaction, leading to the possible formation of Mg(OH)2 layer on the surface-modified ZnMgO (m-ZnMgO) NPs. The presence of Mg(OH)2 overlayer, origin for the desirably reduced electron mobility, is supposedly responsible for the improved charge balance of QD emissive layer (EML). The Mg(OH)2 layer is further found to alleviate the emission quenching of QD EML. Combining blue ZnSeTe QDs and m-ZnMgO NP ETL, highly bright, efficient blue QLEDs with the record luminance of 2904 cd/m2 and external quantum efficiency of 9.5% are demonstrated.
关键词： electron transport layer,Mg(OH)2 overlayer,electroluminescent devices,photoluminescence,ZnSeTe QDs,Cd-free blue quantum dots,QLEDs,ZnMgO nanoparticles
更新于2025-09-19 17:13:59
-
The improved performance and mechanism of solution-processed blue PhOLEDs based on double electron transport layers
摘要： Performance improved solution-processed blue phosphorescent organic light emitting diodes (PhOLEDs) are demonstrated by adopting a double electron transport layer (ETL) strategy, which consists of TPBi and an additional Alq3 ETL. With the help of Alq3 ETL, the performance of the optimal device with a double ETL is significantly enhanced. The maximum luminance of OLEDs is improved from 6787 cd m?2 to 13 054 cd m?2, and the maximum current efficiency is increased from 3.9 cd A?1 to 11.4 cd A?1. Furthermore, the difference of carrier injection in the two types of PhOLEDs is explored by using the transient electroluminescence measurement method. The results imply that double ETL can help to balance electron injection and carrier transport, reduce the interface charge accumulation, leading to a high efficiency. The PL decay of the emission layer with different ETL is detected to analyze the effect of the introduced second ETL layer and the interface on the exciton decay of the emission layer. The results show that the introduced interface in devices with a double ETL has an adverse effect on the exciton emission, which contributes to the serious efficiency roll-off of devices with a double ETL.
关键词： blue PhOLEDs,performance improvement,solution-processed,double electron transport layers,transient electroluminescence measurement
更新于2025-09-19 17:13:59
-
Parallelized Single-Electron Pumps Based on Gate-Tunable Quantum Dots
摘要： Parallelization of pump devices is a direct way to increase the output level of the single-electron pump, which is required for metrological purposes. We fabricated a pair of single-electron pumps in parallel on a chip level and investigated their synchronized electron pumping phenomena. In the investigation, the pumping error was estimated to see whether the error was increased after the parallelization. We found that a proper choice of rf gates must be made in accordance with the direction of the applied magnetic ?eld. In relation with the chirality of the edge state, the rf modulating gates should be chosen not to produce rf-induced heating e?ects.
关键词： Semiconductor quantum dot,Electron transport,Single-electron pump,Single-electron transistor
更新于2025-09-16 10:30:52
-
[IEEE 2019 TEQIP III Sponsored International Conference on Microwave Integrated Circuits, Photonics and Wireless Networks (IMICPW) - Tiruchirappalli, India (2019.5.22-2019.5.24)] 2019 TEQIP III Sponsored International Conference on Microwave Integrated Circuits, Photonics and Wireless Networks (IMICPW) - A Novel Perovskite Solar Cell with ZnO-Cu <sub/>2</sub> O as Electron Transport Material-Hole Transport Material
摘要： Perovskite solar cells have gained remarkable position among the emerging photovoltaic technologies, owing to their increased power conversion efficiency exceeding 20%. The development of various electron transport materials (ETM), perovskite absorbers, hole transport materials (HTM) have contributed well in the efficiency enhancement and stability improvement. One of the major development is the use of ZnO as ETM that replaces TiO2. ZnO has material properties similar to that of TiO2 but possesses improved electron mobility. Moreover, ZnO fabrication methods are easier and of low cost. Cuprous oxide (Cu2O), an earth abundant inorganic p-type material, is recently investigated as a best hole transport material that can replace Spiro-OMeTAD. In this paper, the performance of a planar CH3NH3PbI3 based solar cell using ZnO as ETM and Cu2O as HTM is evaluated using SCAPS 1D software. The combination of ZnO ETM and Cu2O HTM improves the charge transport and reduces the cost. The overall conversion efficiency obtained for the proposed ZnO ? Cu2O perovskite solar cell using CH3NH3PbI3 by SCAPS simulation is 22.77%. The performance of CH3NH3PbI3 based solar cells with ZnO as ETM and with various hole transport materials such as spiro-OMeTAD, CuI, CuSCN and NiO are evaluated and compared with the proposed structure using SCAPS software. The result indicates that ZnO ? Cu2O as ETM-HTM pair is a reliable configuration for CH3NH3PbI3 based solar cell.
关键词： Perovskite,Electron transport materials,Hole transport materials,SCAPS 1D software
更新于2025-09-16 10:30:52