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- 摘要
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- 实验方案
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Tailoring Perovskite Adjacent Interfaces by Conjugated Polyelectrolyte for Stable and Efficient Solar Cells
摘要： Interface engineering is an effective means to enhance the performance of thin film devices, such as perovskite solar cells (PSCs). Here, a conjugated polyelectrolyte, poly[(9,9-bis(3'-((N,N-dimethyl)-N-ethyl-ammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]di-iodide (PFN-I), is employed at the interfaces between the hole transport layer (HTL)/perovskite and perovskite/electron transport layer (ETL) simultaneously, to enhance the device power conversion efficiency (PCE) and stability. The fabricated PSCs with an inverted planar heterojunction structure show improved open-circuit voltage (Voc), short-circuit current density (Jsc) and fill factor (FF), resulting in PCEs up to 20.56%. The devices maintain over 80% of their initial PCEs after 800 hours of exposure to a relative humidity 35-55 % at room temperature. All of these improvements are attributed to the functional PFN-I layers as they provide favorable interface contact and defect reduction.
关键词： perovskite solar cells,non-radiative recombination,conjugated polyelectrolytes,interface engineering
更新于2025-09-23 15:19:57
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Improving energy level alignment by adenine for efficient and stable perovskite solar cells
摘要： NiOx has been widely used as inorganic hole-transport layers (HTLs) in highly efficient hybrid perovskite solar cells (PSCs), however, the solution deposition usually induces pinhole and poor contact with perovskite. In this work, a small organic molecule adenine was used as surface modifier on NiOx substrate for the energy level modulation. After coating adenine, a 0.1 eV energy level drop for NiOx hole-transport layer (HTL), a higher crystallinity and larger grain size of perovskite layer, and an accelerated charge transport and extraction for device were achieved. Density functional theory (DFT) calculations also confirmed that the crystal structure of perovskite on NiOx/adenine substrate was more stable. These benefits enable a higher open-circuit voltage (Voc) and short-circuit current density (Jsc) in the corresponding devices with significantly enhanced moisture and light stability. Our work provides a novel strategy for modulation of energy level alignment between HTL and perovskites in related photovoltaic and other optoelectronic devices.
关键词： crystallinity,hole transport layer,perovskite,stability,interface engineering
更新于2025-09-23 15:19:57
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Fullerenea??Based Interlayers for Breaking Energy Barriers in Organic Solar Cells
摘要： Organic solar cells (OSCs) are lightweight, flexible, and have easy solution processability, thus making them advantageous for large-area device fabrication. The interlayer materials between the electrodes and organic active layer are vital elements for device fabrication. Recently, solution-processable fullerene derivatives have been studied intensively as efficient electrode interlayer materials for solar cell applications. In this Minireview, we summarize recent advances using fullerene derivatives as interlayers in OSCs. The examples include fullerene interlayers from small molecules to polymers, and to organic composites or organic/inorganic hybrid materials. We focus on the comprehensive efforts in developing fullerene-based interlayers and present the understanding of multiple functionalities of these materials as cathode interlayers in bulk hetero-junction (BHJ) OSCs. Our motivation is to describe our current understanding, recent progress, and outstanding issues of fullerene interlayers in OSCs, and propose future potential directions and opportunities.
关键词： fullerenes,interlayers,organic solar cells,surface modifications,interface engineering
更新于2025-09-23 15:19:57
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Naphthalene imide dimer as interface engineering material: An efficient strategy for achieving high-performance perovskite solar cells
摘要： How to design and synthesize interfacial engineered materials that have efficient surface passivation and electron extraction properties is an important problem in the field of optoelectronic materials. Herein, a simple naphthalene imide dimer, namely 2FBT2NDI, is developed by Stille coupling reaction with a high yield, and it is used as interface engineering for inverted perovskite solar cells (PSC). Owing to the existence of intermolecular interactions between MAPbI3 and the 2FBT2NDI layer, the introduction of the interfacial layer can passivate the surface defects of perovskite film and improve interface contact. In addition, 2FBT2NDI exhibits suitable energy levels and high electron mobility because of its large linear conjugated skeleton containing two fluorine atoms, which are beneficial for electron extraction for efficient PSCs. Employing 2FBT2NDI as an interfacial layer, inverted PSCs show a maximum power conversion efficiency of 20.1%, which is over 14% higher than that of the control devices without interfacial layer (17.1%). These results highlight that the naphthalene imide dimer can potentially be used as a commercializable interfacial material for achieving high-performance PSCs.
关键词： electron extraction,perovskite solar cell,naphthalene imide,surface passivation,interface engineering
更新于2025-09-23 15:19:57
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Boosting multiple interfaces by co-doped graphene quantum dots for high efficiency and durability perovskite solar cells
摘要： Organic-inorganic hybrid perovskite solar cells (PSCs), as the most rapidly developing next-generation thin-film photovoltaic technology, have attracted extensive research interests, yet their efficiency, scalability, and durability remain challenging. IH.(cid:8)2O3 could be served as electron transporting layer (ETL) of planar PSCs, which exhibited a much higher humidity and UV light-stability compared to TiO2-based planar PSCs. However, the photovoltaic conversion efficiency (PCE) of Fe2O3-based device was still below 15% because of poor interface contact between IH Fe2O3 and perovskite, and poor crystal quality of perovskite. In this work, we have engineered the interfaces throughout the entire solar cell via incorporating N, S co-doped graphene quantum dots (NSGQDs). The NSGQDs played remarkably multifunctional roles: i) facilitated the perovskite crystal growth; ii) eased charge extraction at both anode and cathode interfaces; iii) induced the defect passivation and suppressed the charge recombination. When assembled with a IH.(cid:8)2O3 ETL, the planar PSCs exhibited a significantly increased efficiency from 14% to 19.2%, with concomitant reductions in hysteresis, which created a new record of PCE for Fe2O3-based PSCs to date. In addition, PSCs with the entire device interfacial engineering showed an obviously improved durability, including prominent humidity, UV light and thermal-stabilities. Our interfacial engineering methodology via graphene quantum dots represents a versatile and effective way for building high efficiency as well as durability PSCs.
关键词： stability,Perovskite solar cells,interface engineering,PCE,graphene quantum dots,Fe2O3
更新于2025-09-23 15:19:57
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Atomic layer deposition for membrane interface engineering
摘要： In many applications, interfaces govern the performance of membranes. Structure, chemistry, electrostatics, and other properties of interfaces can dominate the selectivity, flux, fouling resistance, and other critical aspects of membrane functionality. Control over membrane interfacial properties, therefore, is a powerful means of tailoring performance. In this Minireview, we discuss the application of atomic layer deposition (ALD) and related techniques in the design of novel membrane interfaces. We discuss recent literature in which ALD is used to (1) modify the surface chemistry and interfacial properties of membranes, (2) tailor the pore sizes and separation characteristics of membranes, and (3) enable novel advanced functional membranes.
关键词： membrane interface engineering,pore size tuning,surface modification,functional membranes,atomic layer deposition
更新于2025-09-19 17:15:36
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A universal strategy combining interface and grain boundary engineering for negligible hysteresis and high efficiency (21.41%) planar perovskite solar cells
摘要： Planar perovskite solar cells (PSCs) release the potential to compete with mesoporous PSCs because of comparable power conversion efficiency (PCE) and compatible with the preparation of flexible or tandem PSCs. However, the severe current-voltage hysteresis occurring in PSCs is still a big issue, attributable to the trap-induced charge recombination and ion migration. Herein, we develop a universal strategy combining interface (PMMA:C60) and grain boundary (PTABr) engineeing to effectively eliminate hysteresis of planar PSCs by finely tuning the electron transport layer/perovskite interface and perovskite film morphology (grain size and grain boundary). Microstructure and spectra characterizations, density functional theory (DFT) calculations and photoelectric measurements reveal that this ingenious combination of the two engineering approaches effectively reduce the trap sites and enlarge perovskite grain size, hence leading to negligible hysteresis and high performance PSCs based on various compositional perovskites including MAPbI3, Cs0.15FA0.85PbI3 and Cs0.15FA0.75MA0.1PbI3, with PCE of 18.99%, 19.82%, 21.41% and extra-low hysteresis index of 0.011, 0.007, 0.005, respectively. This work demonstrates a universal strategy to fabricate high efficiency and negligible hysteresis PSCs regardless of perovskite composition.
关键词： hysteresis,power conversion efficiency,grain boundary engineering,interface engineering,perovskite solar cells
更新于2025-09-19 17:13:59
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Functional TiO2 interlayer for all-transparent metal-oxide photovoltaics
摘要： Metal oxide has a high energy bandgap and passes the visible light to enlighten the vision to human eyes. However, the strong and harmful UV light is easily captured by large bandgap metal oxide materials. One of the promising applications of metal oxide manipulation would be the transparent solar cells for the transparent window, to guarantee the view of visible light and generate electric power from the invisible UV radiation. Herein, we demonstrate the all-transparent photovoltaics for see-through applications with the functional deployment of TiO2 layer. P-type NiO and n-type ZnO form a heterojunction to establish a photovoltage. TiO2 layer with donor concentration >1019 cm-3 has flat-band potential of 0.4 V vs reversible hydrogen electrode (RHE) and is significantly higher than that of the photoactive ZnO layer, TiO2 layer insertion enables the multifunctions of giving a back surface field and also serving as a carrier selective transport layer. The ultrathin TiO2 embedded ZnO/NiO device has Ag nanowire top electrode and is highly transparent (>50%) in the visible range. This transparent solar cell provides power conversion efficiency of 6.1% and incident photon to charge carrier efficiency of 79.5% under UV light illumination. Mott-Schottky analysis showed the flat band potential to be 0.9 V by using the TiO2 layer insertion to induce the significant higher photovoltage and photocurrent on/off ratio of higher than 5×105 and played a vital role in the enhanced performance of ZnO/NiO heterostructure. We demonstrated the enhancement of the minority carrier lifetime for a broadband of light illumination via back surface field formation and proposed the energy band-diagram. We may suggest that this high transparent photovoltaic device can be functionally applied on-demands of power generation windows of electronic devices, vehicles and building.
关键词： back surface field,interface engineering,all-metal oxides,Transparent photovoltaics,transient spectroscopy
更新于2025-09-19 17:13:59
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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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Optimizing the Performance of CsPbI3-Based Perovskite Solar Cells via Doping a ZnO Electron Transport Layer Coupled with Interface Engineering
摘要： Interface engineering has been regarded as an effective and noninvasive means to optimize the performance of perovskite solar cells (PSCs). Here, doping engineering of a ZnO electron transport layer (ETL) and CsPbI3/ZnO interface engineering via introduction of an interfacial layer are employed to improve the performances of CsPbI3-based PSCs. The results show that when introducing a TiO2 buffer layer while increasing the ZnO layer doping concentration, the open-circuit voltage, power conversion efficiency, and fill factor of the CsPbI3-based PSCs can be improved to 1.31 V, 21.06%, and 74.07%, respectively, which are superior to those of PSCs only modified by the TiO2 buffer layer or high-concentration doping of ZnO layer. On the one hand, the buffer layer relieves the band bending and structural disorder of CsPbI3. On the other hand, the increased doping concentration of the ZnO layer improves the conductivity of the TiO2/ZnO bilayer ETL because of the strong interaction between the TiO2 and ZnO layers. However, such phenomena are not observed for those of a PCBM/ZnO bilayer ETL because of the weak interlayer interaction of the PCBM/ZnO interface. These results provide a comprehensive understanding of the CsPbI3/ZnO interface and suggest a guideline to design high-performance PSCs.
关键词： Doping,Simulation,Interface engineering,ZnO,All-inorganic CsPbI3 perovskites
更新于2025-09-19 17:13:59