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Improvement of photovoltaic performance of perovskite solar cells by interface modification with CaTiO3
摘要： The ETL/perovskite interface is crucial for the photovoltaic performance of perovskite solar cells (PSCs) because of its key role in electrons transport and charge recombination. Herein, an ultrathin CaTiO3 layer has facilely been fabricated and incorporated between the mp-TiO2 and perovskite layers. Due to the trap passivation effect and the optimized energy level alignment induced by modification, the electron transport is facilitated while the charge recombination is suppressed effectively. Therefore, the champion device gains a maximum PCE of 19.12% with the enhanced photovoltaic performance. In addition, the stability of PSCs has also been ameliorated by modification, and about 85% of the initial efficiency can be maintained even after exposure in ambient for 1000h.
关键词： CaTiO3,Perovskite solar cell,ETL,Interface modification
更新于2025-09-12 10:27:22
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Optimization of MAPbI$_3$-Based Perovskite Solar Cell With Textured Surface
摘要： In this article, the optimized condition for a perovskite solar cell (PSC) with textured surface has been calculated. To accurately model the transport in organic material and organic/inorganic interface, the Gaussian-like density of state function was utilized into Poisson and drift-diffusion solver to present the tail states in the organic material. To calibrate the simulation model, the planar structures with published experimental results are compared. Our results show that the textured structure can improve the open-circuit voltage (Voc) and fill factor and overcome the major problem of PSC because of the short diffusion length. Finally, the efficiency has been improved from 17.8% (planar) to 20.8% (textured). If the metal contact with a suitable work function is chosen, it can be further improved to 22.9%.
关键词： perovskite solar cell (PSC),organic material,MAPbI3,Poisson equation,Drift-diffusion equation,2-D finite-difference time domain (FD-TD),tail states model
更新于2025-09-12 10:27:22
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Structures and Properties of Higher-Degree Aggregates of Methylammonium Iodide toward Halide Perovskite Solar Cells
摘要： Organic–inorganic halide perovskite solar cells have been in the limelight in recent years due to their outstanding power conversion efficiency (PCE) and facile synthesis. Despite of the ever increasing PCE that astonishes the solar cell community, many fundamental structural and theoretical aspects remain elusive, which inhibit our understanding on this fascinating material. Methylammonium iodide (MAI) is one important precursor to fabricate the halide perovskite materials based on the prototypical CH3NH3PbI3. Some MAI might remain in the CH3NH3PbI3 layer, forming a MAI-rich layer that is considered strongly affecting the perovskite solar cell performance. Therefore it is helpful to take one step back to re-evaluate the structures of MAI that is overlooked in many perovskite solar cell studies. In this manuscript, we identify the alternative structures of MAI aggregates via the ab-initio calculations, including the monomeric, dimeric, trimeric, tetrameric, pentameric, hexameric, heptameric, octameric and decameric structures of MAI. These aggregate structures are proposed to act as a simplified, yet efficient model to represent the MAI-rich region in perovskite solar cells that are usually simulated using the computationally expensive slab model. We find that the aggregates of MAI are universally stabilized by the hydrogen bonds. We further evaluate these MAI aggregate structures via studying the interactions between the MAI aggregates and an experimentally-proven additive iodopentafluorobenzene (IPFB) as an example, and show that the iodine atoms in the MAI aggregates acting as potential charge traps could be passivated by the additive molecule. The present study provides an efficient modeling platform for the MAI-rich halide perovskite materials without high computational cost.
关键词： aggregates,perovskite solar cell,methylammonium iodide,ab initio
更新于2025-09-12 10:27:22
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Hexylammonium Iodide Derived Two-Dimensional Perovskite as Interfacial Passivation Layer in Efficient Two-Dimensional/Three-Dimensional Perovskite Solar Cells
摘要： Defects locating within grain boundaries or on the film surface, especially organic cation vacancies and iodine vacancies make the fabrication of perovskite solar cells (PSCs) with superior performance a challenge. Organic ammonium iodide is a promising candidate and has been frequently used to passivate these defects by forming two-dimensional (2D) perovskite. In this work, it is found that the chain length of organic ammonium iodide is a crucial factor on the defect passivation effect. Compared to butylammonium iodide (BAI), hexylammonium iodide (HAI) derived 2D perovskite is more efficient in decreasing interfacial defects, resulting in a notably enhanced photoluminescence lifetime and a more suppressed interfacial charge recombination process. As a consequence, the ultimate power conversion efficiency (PCE) has reached 20.62% (3D+HAI) as compared to 18.83% (3D). Moreover, the long-term durability of the corresponding PSCs against humidity and heat is simultaneously improved. This work once again demonstrates that 2D/3D structure is promising for further improving the PCE and stability of PSCs.
关键词： perovskite solar cell,organic ammonium iodide,stability,interfacial passivation,2D/3D stacking structure
更新于2025-09-12 10:27:22
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Performance evaluation and material parameter perspective of eco-friendly highly efficient CsSnGeI3 perovskite solar cell
摘要： Lead toxicity and stability are major hurdles in commercialization of the perovskite solar cell. We present the theoretical investigation and analysis of eco-friendly and stable CsSnGeI3 based solar cell. For better understanding of material parameter, various factors affecting the cell performance such as thickness, doping concentration, defect density and doping density of charge transport layer have been rigorously investigated. From simulation results, we observed that the device performance extensively depends on defect density and doping concentration of perovskite absorber layer. We have proposed Cesium Tin–Germanium Tri-iodide (CsSnGeI3) as an efficient light absorber material as compared to lead counterparts. With optimized parameters of proposed architecture, we have achieved 13.29% efficiency. We have also done the comparative analysis of different hole transport layer (HTL) layers to replace spiro-OMeTAD. The results indicate that CsSnGeI3 can be a great prospective to be an absorber layer for high-efficiency perovskite solar cells.
关键词： Non-toxic,Defects,HTL,Perovskite solar cell,CsSnGeI3
更新于2025-09-12 10:27:22
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Exploring RGB Light‐Activated Degradation of Perovskite Films and Solar Cells for Near Space Application
摘要： Hybrid perovskite solar cells with high specific power have great potential of becoming a promising power source mounted on spacecraft in space application. However, there is a lack of study on their photostability as light absorber at the condition. Here, we explore the stability of the perovskite films and solar cells under RGB light illumination in the medium vacuum that belongs to near space. The perovskite active layers exhibit the different degradations from morphological, chemical and structural point of view. This is attributed to the strong coupling between photoexcited carriers and the crystal lattice, and the diversity of RGB light absorption in the perovskite films. Device characterizations reveals that the efficiency loss of perovskite solar cells results from not only the perovskite degradation, but also the photoexcited carriers reducing the energy barrier of ion migration and accelerating the migration to generate more deep-level trap defects. Moreover, comparative devices suggest that the well encapsulation could weaken the effect of the vacuum on the stability.
关键词： perovskite solar cell,RGB light,stability,photoinduced degradation,near space
更新于2025-09-12 10:27:22
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Defect Passivation in Hybrid Perovskite Solar Cells by Tailoring the Electron Density Distribution in Passivation Molecules
摘要： Commercialization of perovskite solar cells (PSCs) requires developing high?efficiency devices with good stability. Ionic defects existing in perovskite layer can serve as non-radiative recombination center to deteriorate the performance of PSCs, and can introduce chemical degradation of the perovskite material introducing instability issues. Here, passivation molecules with various electron density distribution (EDD) are employed as an ideal model to reveal the role of EDD on defect passivation in perovskite thin films. Power conversion efficiency (PCE) exceeding 21% with good stability in humid air was obtained for planar PSCs with 4-aminobenzonitrile (ABN) additive, higher than the reference PSCs with a PCE of 20.22%. The improved stability and performance features are attributed to the efficient passivation for charged defects in perovskites by adding ABN, which guarantees a smaller Urbach energy, longer carrier lifetime and less traps in the perovskite films.
关键词： perovskite solar cell,electron density distribution,stability,defect passivation,recombination
更新于2025-09-12 10:27:22
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Inorganic CuFeO2 Delafossite Nanoparticles as Effective Hole Transport Material for Highly Efficient and Long-Term Stable Perovskite Solar Cells
摘要： The regular architecture (n-i-p) of perovskite solar cells (PSCs) has an ascendant interest in the renewable energy field, owing to high certified efficiencies in the recent years. However, there are still serious obstacles of PSCs associated with spiro-OMeTAD hole transport material (HTM), such as: i-) prohibitively expensive material cost (~150-500 $/g) and ii-) operational instability at elevated temperatures and high humidity levels. Herein, we have reported the highly photo-, thermal- and moisture-stable and cost-effective PSCs employing inorganic CuFeO2 delafossite nanoparticles as HTM layer, for the first time. By exhibiting superior hole mobility and additive-free nature, the best-performing cell achieved a power conversion efficiency (PCE) of 15.6% with a negligible hysteresis. Despite exhibiting the lower PCE as compared to spiro-OMeTAD-based control cell (19.1%), non-encapsulated CuFeO2-based cells maintained above 85% of their initial efficiency, while the PCE of control cells dropped to ~10% under continuous illumination at maximum power point (MPP) tracking after 1000 h. More importantly, the performance of control cells was quickly degraded at above 70 oC whereas CuFeO2-based cells, retaining ~80% of their initial efficiency after 200 h, was highly stable even at 85 oC in ambient air under dark conditions. Besides appearing on significant improvement in stability against light soaking and thermal stress, CuFeO2-based cells exhibited superior shelf stability even at 80 ± 5% relative humidity and retained over 90% of their initial PCE. Overall, we strongly believe that this study highlights the potential of inorganic HTMs for the commercial deployment of long-term stable and low-cost PSCs.
关键词： Perovskite solar cell (PSC),Operational stability,CuFeO2 delafossite nanoparticles,Inorganic hole transport material (HTM),Thermal and moisture stability
更新于2025-09-12 10:27:22
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Single-Source Vapor-Deposited Cs2AgBiBr6 Thin Films for Lead-Free Perovskite Solar Cells
摘要： Lead-free double perovskites have been considered as a potential environmentally friendly photovoltaic material for substituting the hybrid lead halide perovskites due to their high stability and nontoxicity. Here, lead-free double perovskite Cs2AgBiBr6 films are initially fabricated by single-source evaporation deposition under high vacuum condition. X-ray diffraction and scanning electron microscopy characterization show that the high crystallinity, flat, and pinhole-free double perovskite Cs2AgBiBr6 films were obtained after post-annealing at 300°C for 15 min. By changing the annealing temperature, annealing time, and film thickness, perovskite Cs2AgBiBr6 solar cells with planar heterojunction structure of FTO/TiO2/Cs2AgBiBr6/Spiro-OMeTAD/Ag achieve an encouraging power conversion efficiency of 0.70%. Our preliminary work opens a feasible approach for preparing high-quality double perovskite Cs2AgBiBr6 films wielding considerable potential for photovoltaic application.
关键词： perovskite solar cell,lead-free,thin film,single-source vapor deposition
更新于2025-09-12 10:27:22
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Comparison of Efficiency analysis of Perovskite solar cell by altering Electron and Hole transporting layers
摘要： The methylamine lead halide perovskites as the light harvesting material in solar devices are emerging and promising due to their easy manufacturing process and large photovoltaic efficiency. Generally perovskite solar cells consist of a structure in which the perovskite light absorbing layer is sandwiched between electron and hole transporting layers (ETLs and HTLs). Herein we report four types of perovskite (CH3NH3PbBr3) solar cells which were fabricated in the absence and presence of electron transporting layer (Titanium dioxide (TiO2)) and hole transporting layer (2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-pirobifluorene (Spiro-OMeTAD)). Efficiency comparison analysis of fabricated solar cells was performed in the absence and presence of electron and hole transporting layers. All layers were deposited by spin-coating method. Different analysis using XRD, SEM, UV and IV measurements were carried out for all samples. Maximum power conversion efficiency of 13.8 % was obtained.
关键词： Hole transport material free,mesoporous Titanium dioxide,Perovskite solar cell,photovoltaic technology
更新于2025-09-12 10:27:22