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Enhanced efficiency and stability of planar perovskite solar cells by introducing amino acid to SnO2/perovskite interface
摘要： Many recent studies have shown that perovskite solar cells (PSCs) employing SnO2 as an electron transport layer (ETL) exhibit extremely high efficiency which is close to that of the device with the same structure using TiO2. Considering the sensitivity of the PSC performance to the ETL/perovskite interface, interface engineering of the SnO2 electron transport layer helps to further release the potential of planar structure PSCs and promote their commercialization. Herein, we introduce an amino acid self-assembled layer onto the SnO2 ETL as the buffer layer to modulate the SnO2/perovskite lattice mismatch induced interface stress, and enhanced the interface interaction between SnO2 and perovskite caused by hydrogen-bonding and/or electrostatic interactions between the amino groups and the perovskites framework. Due to the improved perovskite film quality and enhanced interface charge transfer/extraction, a champion efficiency of 20.68% (Jsc ? 24.15 mA/cm2, Voc ? 1.10 V, and FF ? 0.78) is obtained for Cs0.05MAyFA0.95-yPbI3-xClx planar PSCs.
关键词： Perovskite solar cells,SnO2,Interface engineering,Glycine buffer layer,Self-assembly
更新于2025-09-19 17:13:59
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Enhanced Visible-light-driven Photoelectrochemical and Photocatalytic Performance of Au-SnO2 quantum dot-anchored g-C3N4 Nanosheets
摘要： A novel g-C3N4/Au-SnO2 quantum dot (g-CN/Au-SQD) ternary nanocomposite was fabricated via a three-step approach for the degradation of the organic pollutant rhodamine B (RhB), and photoelectrochemical (PEC) water splitting upon visible light illumination. Au-SQDs were prepared via a one-pot chemical reduction method, and g-CN was synthesized via the thermal polymerization of urea at 550 ℃. The g-CN/Au-SQD ternary nanocomposite was prepared via sonication, stirring, and finally annealing. This approach was effective for the mixing and dispersion of Au-SQDs over the entire surface of the two-dimensional (2D) g-CN nanosheets. Morphological studies revealed that the Au-SQDs were well-distributed over the nanolayers of the g-CN. The light-capturing ability was improved and optimized with the loading of different amounts of Au-SQDs. The bandgap was tuned from 2.85 eV (g-CN) to 2.58 eV (g-CN/Au-SQD). Photoluminescence analysis revealed the inhibited nature of recombination of electrons and holes in the ternary nanocomposites. Optimization yielded CNAS-20, which exhibited the best photocatalytic performance within 40 min for the degradation of the pollutant RhB. Furthermore, the CNAS-20 photoelectrode showed lower charge-transfer resistance than the other prepared samples, which was favorable for PEC water splitting. The CNAS-20 photoelectrode exhibited a significant photocurrent, which was ~3.83 times greater than that of pure g-CN. Thus, this unique design incorporates a 2D g-CN and plasmonic Au metal nanoparticles for the generation of photoexcited electrons, and SQDs receive these photogenerated electrons to increase the leave-taking of electron and holes to enhance the photocatalytic and PEC activities.
关键词： Quantum dots,Photocatalysis,g-C3N4,Au-SnO2,Surface plasmon resonance
更新于2025-09-19 17:13:59
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Characterization and analysis of FA <sub/><i>x</i> </sub> Cs <sub/> (1? <i>x</i> ) </sub> Pb(I <sub/><i>y</i> </sub> Br <sub/> (1? <i>y</i> ) </sub> ) <sub/>3</sub> perovskite solar cells with thickness controlled transport layers for performance optimization
摘要： Strong characterization methods are needed to fully comprehend the chemistry and composition of perovskite solar cells. Understanding the interaction between layers inside a cell and how they react with the environment is important to achieve optimum manufacturing processes, and improve efficiency of perovskite solar cells. Here, we probe a hybrid organic-inorganic perovskite cell structure formed by a fluorine-doped tin oxide (FTO), cassiterite (SnO2), mixed halide perovskite, Spiro-OMeTAD and silver layers. We have demonstrated a power conversion efficiency (PCE) greater than 19% and aVoc of more than 1.1 V for a wide-band gap (1.6 eV) perovskite solar cell.
关键词： Spiro-OMeTAD,perovskite solar cells,efficiency,SnO2,characterization
更新于2025-09-19 17:13:59
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Room-temperature processed ZrO2 interlayer towards efficient planar perovskite solar cells
摘要： The Sn-doped In2O3 transparent conductive (ITO) electrode in planar perovskite solar cells (PSCs) is modified by zirconia (ZrO2) interlayer with low-temperature process. Here the ZrO2 film is prepared by ultraviolet (UV) treatment at room temperature. The effects of the inserted ZrO2 interlayer on the performance of CH3NH3PbI3-xClx-based PSCs have been systemically studied. After optimizing the process, the champion efficiency of PSC with UV-treated ZrO2 interlayer is 19.48%, which is larger than that of the reference PSC (15.56%). The improved performance in the modified devices is primarily ascribed to the reduced trap states and the suppressed carrier recombination at the ITO/SnO2 interface. Our work provides a facile route to boost the photovoltaic performance of PSCs by modifying the surface of transparent conductive electrode at room temperature.
关键词： Photoelectric properties,ITO/SnO2 interface modification,Ultraviolet (UV) treatment,Planar perovskite solar cell,Room-temperature processed ZrO2 interlayer
更新于2025-09-19 17:13:59
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Interfacial modification using ultrasonic atomized graphene quantum dots for efficient perovskite solar cells
摘要： Tin dioxide (SnO2) is a promising electron transport material to replace traditional titanium dioxide (TiO2) for fabricating efficient planar perovskite solar cells (PSCs). However, in order to realize process compatibility and larger scale device, low temperature solution processed SnO2 is normally used, which generates numerous trap states in ETL layer and directly affects the device performance. Here, an interfacial modification strategy proposed, depositing an ultrasonic atomized ultrathin graphene quantum dots (GQDs) layer between tin dioxide (SnO2) and perovskite layer. Ultrasonic atomized deposition can effectively prevent the damage of the surface chemical properties of SnO2 by aqueous solution. Additionally, we demonstrate that the GQDs change the surface property of SnO2 film, and optimized the charge transport capability in SnO2 and perovskite interface. Correspondingly, we obtained a significant power conversion efficiency (PCE) improvement for CH3NH3PbI3-based PSCs from 13.61% to 16.54% and reached a highest steady-state PCE over 16%. We believe that the interfacial modification engineering by means of ultrasonic atomizing process is a promising tactic to obtain efficient perovskite solar cells.
关键词： Interface modification,SnO2,Ultrasonic atomizing,Perovskite solar cells,Graphene quantum dots
更新于2025-09-19 17:13:59
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Aged sol-gel solution-processed texture tin oxide for high-efficient perovskite solar cells
摘要： Mesoporous n–i–p perovskite solar cells (PeSCs) demonstrate attractive potentials for obtaining high power conversion efficiencies (PCEs), by employing inorganic electron transport layers (ETLs). However, these ETLs composed of dual layers (a condense layer and a mesoporous layer) suffer composite process and high sintering temperature. Here, we demonstrate a simple and efficient process to improve the device performance of PeSCs by using a textured SnO2 film. Self-aged sol-gel SnO2 solution after spin coating results in a textured structure without sacrificing the surface coverage. Excellent light trapping ability is achieved by optimizing the aged time of sol-gel SnO2 solution, which mimics the evolution of conventional mesoporous layer. Such SnO2 textured structure provides a large contact area for rapid charge extraction, and alleviates interfacial recombination loss. Therefore, this PeSC yields an optimal PCE of 19%, which is prominent in state-of-the-art SnO2-based devices. These results indicate that one-step solution processed SnO2 with textured structure offers a simple and efficient way to improve the device performance of PeSCs without a complex process.
关键词： SnO2,electron transport layer,Perovskite solar cells,textured structure
更新于2025-09-19 17:13:59
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Polyelectrolyte‐Doped SnO <sub/>2</sub> as a Tunable Electron Transport Layer for High‐Efficiency and Stable Perovskite Solar Cells
摘要： The charge transport layer is crucial to the performance and stability of the perovskite solar cells. Compared with other conventional metal oxide electron transport materials, SnO2 has a deeper conduction band and higher electron mobility, and can efficiently serve as an electron transport layer to facilitate charge extraction and transfer. In this study, we have reported an optimized low temperature solution processed SnO2 electron transport layer by doping PEIE polyelectrolyte into SnO2 for the first time in the perovskite solar cells. It was found that the performance of all aspects of the doped SnO2 film was improved than that of the pristine SnO2 film. The better energy level alignment, larger built-in field, enhanced electron transfer/extraction, and reduced charge recombination all contribute to the improved device performance. Finally, a perovskite solar cell with a power conversion efficiency of 20.61 % was successfully prepared under low temperature below 150 oC. Moreover, the stability of the doped SnO2-based device was also greatly improved.
关键词： doping,perovskite solar cells,PEIE,SnO2,electron transport layer
更新于2025-09-19 17:13:59
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Low Temperature Processed Highly Efficient Hole-Transport-Layer Free Carbon-based Planar Perovskite Solar Cells with SnO2 Quantum Dot Electron-Transport-Layer
摘要： The use of expensive hole transport layer (HTL) and back contact along with the stability issue of perovskite solar cells have been a detrimental factor when it comes to commercialization of the technology. In addition, high-temperature and long annealing time processed electron transport layers (ETLs, e.g., TiO2) prevents the flexible solar cell application in most polymer substrate. Herein, we opted for HTL-free carbon electrodes owing to their low-cost production and superior stability in air, compared to their noble metal counterparts. In this work, we fabricate planar perovskite solar cells using low-temperature solution processed SnO2 quantum dots (QDs) as ETL, which offers significant advantages over high temperature processed ETLs due to its excellent electron extraction and hole blocking ability. In addition, by integrating a low cost and stable carbon electrode, an impressive energy conversion efficiency of 13.64% with a device architecture glass/In doped SnO2/QD-SnO2/Perovskite/Carbon under 1 sun illumination at ambient conditions have been achieved. This work paves the way to achieve fully low-temperature processed printable perovskite solar cells (PSCs) at an affordable cost by integrating the QD SnO2 ETL and Carbon electrode.
关键词： low-temperature process,planar perovskite solar cells,hole transport layer free,carbon electrode,SnO2 Quantum Dot
更新于2025-09-19 17:13:59
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Low Temperaturea??Processed Zr/F Coa??Doped SnO <sub/>2</sub> Electron Transport Layer for Higha??Efficiency Planar Perovskite Solar Cells
摘要： The energy band position and conductivity of electron transport layers (ETLs) are essential factors that restrict the efficiency of planar perovskite solar cells (p-PSCs). Tin oxide (SnO2) has become a primary material in ETLs due to its mild synthesis condition, but its low conduction band position and limited intrinsic carriers are disadvantageous in electron transport. To solve these problems, this work exquisitely designs a Zr/F co-doped SnO2 ETL. The doping of Zr can raise the conduction band of SnO2, which reduces the energy barrier in electron extraction and inhibits the interface recombination between the ETL and perovskite. The open-circuit voltage (VOC) of p-PSCs consequently increases. F? doping belongs to n-type doping. Thus, it equips SnO2 with a large number of free electrons and improves the conductivity of the ETL and short-circuit current (JSC). The device based on Zr/F co-doped ETL achieves a high efficiency of 19.19% and exhibits a reduced hysteresis effect, which is more satisfactory than that of a pristine device (17.35%). Overall, our research successfully adjusts the energy band match and boosts the conductivity of ETL via Zr/F co-doping. The results provide an effective strategy for fabricating high-efficiency p-PSCs.
关键词： electron transport layer,Zr/F co-doping,energy level match,planar perovskite solar cell,tin oxide (SnO2)
更新于2025-09-19 17:13:59
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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