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ZnxCd1-xSe nanoparticles decorated ordered mesoporous ZnO inverse opal with binder-free heterojunction interfaces for highly efficient photoelectrochemical water splitting
摘要： Well-defined porous heteronanostructures with broad light absorption range and efficient charge transfer are the key challenges towards developing efficient photoanodes for photoelectrochemical (PEC) water splitting. Herein, we reported a facile template and continuous ion exchange method to fabricate three-dimensional ordered mesoporous (3DOM) ZnO/ZnxCd1-xSe inverse opal with binder-free heterojunction interfaces on F-doped SnO2 glass. The heteroepitaxial growth of ZnxCd1-xSe shell layer on ZnO inverse opal skeleton surface provided favorable type-II band alignment, low interfacial resistance, and high visible light absorption. As expected, the optimized 3DOM ZnO/ZnxCd1-xSe inverse opal achieved a significant saturated photocurrent density of 24.76 mA cm-2 at 1.23 V versus a reversible hydrogen electrode (RHE) in 0.25 M Na2S and 0.35 M Na2SO3 aqueous solution under AM 1.5 G simulated solar light irradiation (100 mW cm-2), which is 25 times higher than that of the pristine ZnO (0.99 mA cm-2 at 1.23 V versus RHE) photoanode. The maximum photoconversion efficiency reached 10.64% for the optimized 3DOM ZnO/ZnxCd1-xSe inverse opal at an applied potential of 0.52 V versus RHE, an about 22.63 times increase relative to that of the pristine ZnO inverse opal (0.47% at 0.61 V versus RHE). In addition, the photostability of the optimized 3DOM ZnO/ZnxCd1-xSe inverse opal photoanode was also greatly improved in the electrolyte solution, 82.6% initial value was maintained even after 3000 s continuous light illumination without any protective coating layer. Such prominent PEC performances of the as-prepared 3DOM ZnO/ZnxCd1-xSe inverse opal can be ascribed to the improved visible light harvesting and enhanced charge separation/collection efficiency. This work provides a fundamental insight to design the efficient photoanode for high performance water splitting.
关键词： Heteroepitaxial growth,ZnO/ZnxCd1-xSe,Inverse opal,Photoelectrochemical water splitting,Heterojunction interface
更新于2025-09-23 15:23:52
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Interfacial passivation of n-ZnO/p-Si heterojunction by CuI thin layer
摘要： The ZnO/Si heterojunction diode can be integrated with the Si process, which has attracted great attention in recent years. However, the large number of interface states at the ZnO/Si heterojunction interface could adversely affect its optoelectronic properties. Here, n-type ZnO thin film was deposited on p-Si substrate for formation of an n-ZnO/p-Si heterojunction substrate. To passivate the ZnO/Si interface, a thin CuI film interface passivation layer was inserted at the ZnO/p-Si heterojunction interface. Electrical characterization such as I–V and C–V characteristic curves confirmed the significant improvement of the heterojunction properties e.g. enhancement of forward current injection, reduction of reverse current and improvement of the rectification ratio. These results showed that the passivation of interface is critical for ZnO/Si heterojunctions.
关键词： CuI,heterojunction,interface states,electrical properties,ZnO/p-Si
更新于2025-09-23 15:23:52
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An inverted ZnO/P3HT:PbS bulk-heterojunction hybrid solar cell with a CdSe quantum dot interface buffer layer
摘要： An inverted bulk-heterojunction (BHJ) hybrid solar cell having the structure ITO/ZnO/P3HT:PbS/Au was prepared under ambient conditions and the device performance was further enhanced by inserting an interface buffer layer of CdSe quantum dots (QDs) between the ZnO and the P3HT:PbS BHJ active layer. The device performance was optimized by controlling the size of the CdSe QDs and the buffer layer thickness. The buffer layer, with an optimum thickness and QD size, has been found to promote charge leading to an increased open-circuit voltage (VOC), extraction and reduces interface recombinations, short circuit current density (JSC), fill factor (FF) and power conversion efficiency (PCE). About 40% increase in PCE from 1.7% to 2.4% was achieved by the introduction of the CdSe QD buffer layer, whose major contribution comes from a 20% increase of VOC.
关键词： CdSe quantum dots,inverted bulk-heterojunction,interface buffer layer,hybrid solar cell,power conversion efficiency
更新于2025-09-23 15:21:01
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Interface configuration effects on excitation, exciton dissociation, and charge recombination in organic photovoltaic heterojunction
摘要： The morphology of donor-acceptor heterojunction interface significantly affects the electron/hole processes in organic solar cells, including charge transfer (CT), exciton dissociation (ED), and charge recombination (CR). Here, to investigate interface molecular configuration effects, the donor-acceptor complexes with face-on, edge-on, and end-on configurations were constructed as model systems for the p-SIDT(FBTTh2)2/C60 heterojunction. The geometries, electronic structures, and excitation properties of monomers and the complexes with three configurations were studied based on density functional theory (DFT) and time-dependent DFT calculations with optimally tuned range separation parameters and solid polarization effects. In terms of Marcus theory, the rate constants of ED and CR processes were analyzed. The results show that most of the excited states for p-SIDT(FBTTh2)2 exhibit an intramolecular CT character, and the similarity of the excitation characters (CT and local excitation) and energies among three complexes with different configurations indicate that the electronic structure and excitation properties are insensitive to the interfacial molecular configurations. However, the rates of ED and CR processes heavily depend on it. These results underline the importance of controlling molecular configuration and then the morphology at the heterojunction interface in organic solar cells.
关键词： organic heterojunction interface,charge transfer,electronic structure,charge recombination
更新于2025-09-16 10:30:52
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Beyond 10% efficiency Cu <sub/>2</sub> ZnSnS <sub/>4</sub> solar cells enabled by modifying the heterojunction interface chemistry
摘要： Wide band gap pure sulphide kesterite Cu2ZnSnS4 is a promising environmentally friendly and low-cost photovoltaic material, which has attracted intense research interest. However, the record e?ciency of solar cells based on Cu2ZnSnS4 absorbers just overcame the benchmark 10%, being far from the e?ciency requirement for industrial-scale deployment. Recombination at the heterojunction interface accounts for a large proportion of the performance loss. Here we report a substantial improvement of the Cu2ZnSnS4 solar cell e?ciency to over 10% enabled by modifying the Cu2ZnSnS4/Zn1?xCdxS heterojunction interface. We found that the introduction of the ammonium hydroxide during the Zn1?xCdxS deposition process can lead to a signi?cant reduction of Zn related hydroxide and oxide impurities. The modi?ed chemistry environment at the heterojunction interface facilitates the decrease of interface defects and promotes the interface microstructure quality. The improved heterojunction interface with suppressed interface recombination contributes to the enhanced open circuit voltage, ?ll factor and overall device performance.
关键词： Cu2ZnSnS4,solar cells,Zn1?xCdxS,ammonium hydroxide,heterojunction interface
更新于2025-09-16 10:30:52
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Regulating the Phase Separation of Ternary Organic Solar Cells via 3D Architectured AIE Molecules
摘要： An optimized bulk heterojunction (BHJ) interface, certifying enhanced exciton-splitting, charge separation and recombination inhibition, is vastly desired to obtain high power conversion efficiencies (PCEs). Herein, the ternary strategy has been employed to effectively modify the phase separation between the J71:ITIC blend by incorporating a 3D aggregation-induced emission (AIE) material, Tetraphenylethylene (TPE). Hence, as a consequence of improved charge mobility, lower bimolecular recombination and enhanced fill factor (FF), an excellent PCE of 12.16% has been achieved; a 21.23% increment over the PCE of binary devices. Likewise, Flory-Huggins parameter (c ) and surface free energy analysis reveals a high degree of miscibility between J71 and TPE, that leads to a rearrangement at the D-A interface such that TPE settles in between the D and A and thus forces the ITIC away from J71 and out of the mixed phase, indicating relatively higher average acceptor domain purity at the interface and ultimately better FF and PCE for the ternary devices. Likewise, TPE inclusion in various other fullerene and nonfullerene systems also leads to similar results, signifying this to be an effective methodology to boost the PCEs of the organic solar cells, especially for the systems with low FF.
关键词： energy transfer,aggregation-induced emission,3D molecule,ternary organic solar cells,bulk heterojunction interface,phase separation
更新于2025-09-12 10:27:22
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WS2 quantum dots seeding in Bi2S3 nanotubes: A novel Vis-NIR light sensitive photocatalyst with low-resistance junction interface for CO2 reduction
摘要： Efficient photocatalysts sensitive to visible and near infrared lights have attracted increased concerns owing to the high utilization efficiency of solar energy. Herein, WS2 quantum dots (WS2 QDs) doped Bi2S3 nanotubes with smooth surface were constructed by seed-mediated strategy with WS2 QDs as seeds, which show sensitive response to Vis-NIR lights. In WS2@Bi2S3 structure, exposed S atoms in WS2 QDs combined Bi3+ ions to form Bi-S bonds, and enabled the S-sharing between WS2 and Bi2S3 unit cells. The perfect junction interface between WS2 and Bi2S3 is straight and smooth without any disordered atoms, endowing low resistance for fast electron transfer on the interface and efficient separation of electron-hole pairs. Compared with pristine Bi2S3 nanotubes, the WS2@Bi2S3 nanotubes display enhanced photocatalytic activity in CO2 reduction, with 38.2 μmol g-1 of methanol and 27.8 μmol g-1 of ethanol achieved at optimal WS2 loading content (4 wt%) under Vis-NIR light irradiation for 4 h. It is proposed that the low-resistance interface between WS2@Bi2S3 heterojunction and the regulated electron pathway along Bi2S3 nanotubes account for the high photocatalytic activity, which enables WS2@Bi2S3 a promising and unique photocatalyst, and indicates a new direction for light harvest.
关键词： WS2 quantum dots,Bi2S3 nanotube,photocatalytic reduction of CO2,seed-mediated,heterojunction interface
更新于2025-09-12 10:27:22