- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Reviewing and understanding the stability mechanism of halide perovskite solar cells
摘要： Finding sustainable and renewable energy to replace traditional fossil fuel is critical for reducing greenhouse gas emission and avoiding environment pollution. Solar cells that convert energy of sunlight into electricity offer a viable route for solving this issue. At present, halide perovskites are the most potential candidate materials for solar cell with considerable power conversion efficiency, whereas their stability remains a challenge. In this work, we summarize four different key factors that influence the stability of halide perovskites: (a) effect of environmental moisture on the degradation of halide perovskites. The performance of halide perovskite solar cells is reduced due to hydrated crystal hinders the diffusion of photo-generated carriers, which can be solved by materials encapsulation technique; (b) photo-induced instability. Through uncovering the underlying physical mechanism, we note that materials engineering or novel device structure can extend the working life of halide perovskites under continuous light exposure; (c) thermal stability. Halide perovskites are rapidly degraded into PbI2 and volatile substances as heating due to lower formation energy, whereas hybrid perovskite is little changed; (d) electric field effect in the degradation of halide perovskites. The electric field impacts significantly on the carrier separation, changes direction of photo-induced currents and generates switchable photovoltaic effect. For each key factor, we have shown in detail the underlying physical mechanisms and discussed the strategies to overcome this stability difficulty. We expect this review from both theoretical and experimental points of view can be beneficial for development of perovskite solar cell materials and promotes practical applications.
关键词： stability mechanism,ion diffusion,perovskite solar cell
更新于2025-09-23 15:21:01
-
A Dopanta??Free Hole Transporting Layer for Efficient and Stable Planar Perovskite Solar Cells
摘要： Hybrid organic-inorganic perovskites are attractive materials for the fabrication of efficient thin film solar cells. In order to make perovskite solar cells (PSCs) suitable for commercialization, stability issue should be addressed properly. In this work, we introduce a new dopant-free organic material, PV2000, as a stable hole transporting layer (HTL) for the fabrication of stable and efficient PSCs. For this purpose, we fabricate planar PSCs using a triple-A cation perovskite composition and replace commonly used 2,2′,7,7′ -Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) HTL by dopant-free PV2000 polymer. Our characterization results disclose that the PV2000 has a great thermal stability, good hole mobility and suitable band alignment that well-matched with the valence band of triple-A cation perovskite. After proper optimization of PV2000 film thickness, we achieve a planar PSC with a maximum power conversion efficiency (PCE) of 18.93%, which is comparable with the spiro-based device (19.62%). Moreover, we further improve the PCE of the PV2000 based device up to 20.5% using a band alignment engineering by deposition thin layer of polyvinylpyrrolidone (PVP) at perovskite/HTL interface. More importantly, we find that the thermal, moisture and operational stabilities of the PSCs with PV2000 HTL are improved drastically as compared to the spiro-based devices, where the PSC with PV2000 retains ~88% of its initial PCE value under continuous illumination for 250 h as compared to the spiro-based one (39%).
关键词： efficiency,PV2000,stability,Perovskite solar cell,Hole transporting layer
更新于2025-09-23 15:21:01
-
Suppressed Interdiffusion and Degradation in Flexible and Transparent Metal Electrode-Based Perovskite Solar Cells with a Graphene Interlayer
摘要： Metal-based transparent conductive electrodes (TCEs) are attractive candidates for application in indium tin oxide (ITO)-free solar cells due to their excellent electrical conductivity and cost effectiveness. In perovskite solar cells (PSCs), metal-induced degradation with the perovskite layer leads to various detrimental effects, deteriorating the device performance and stability. Here, we introduce a novel flexible hybrid TCE consisting of a Cu grid-embedded polyimide film and a graphene capping layer, named GCEP, which exhibits excellent mechanical and chemical stability as well as desirable optoelectrical properties. We demonstrated the critical role of graphene as a protection layer to prevent metal-induced degradation and halide diffusion between the electrode and perovskite layer; the performance of the flexible PSCs fabricated with GCEP was comparable to that of their rigid ITO-based counterparts and also exhibited outstanding mechanical and chemical stability. This work provides an effective strategy to design mechanically and chemically robust ITO-free metal-assisted TCE platforms in PSCs.
关键词： metal-induced degradation,perovskite solar cell,Flexibility,graphene,transparent conductive electrode
更新于2025-09-23 15:21:01
-
SiO<sub>2</sub> nanoparticle-regulated crystallization of lead halide perovskite and improved efficiency of carbon-electrode based, low temperature planar perovskite solar cells
摘要： SiO2 nanoparticles were used to regulate the crystallizing process of lead halide perovskite film that prepared by the sequential deposition method, which was used in the low temperature processed, carbon-electrode basing, hole-conductor-free planar perovskite solar cells. It was observed that, after adding small amount of SiO2 precursor (1% in volume ratio) into the lead iodide solution, performance parameters of open-circuit voltage, short-circuit current and fill factor were all upgraded, which helped to increase the power conversion efficiency (reverse scan) from 11.44(±1.83)% (optimized at 12.42%) to 14.01(±2.14)% (optimized at 15.28%, AM 1.5G, 100 mW/cm2). Transient photocurrent decay curve measurements showed that, after the incorporation of SiO2 nanoparticles, charge extraction was accelerated, while transient photovoltage decay and dark current curve tests both showed that recombination was retarded. The improvement is due to the improved crystallinity of the perovskite film. X-ray diffraction and scanning electron microscopy studies observed that, with incorporation of amorphous SiO2 nanoparticles, smaller crystallites were obtained in lead iodide films, while larger crystallites were achieved in the final perovskite film. This study implies that, amorphous SiO2 nanoparticles could regulate the coarsening process of the perovskite film, which provides an effective method in obtaining high quality perovskite film.
关键词： SiO2 (61.46.Hk),crystallization(81.10.-h),low temperature(84.60.Jt),perovskite solar cell(88.40.H-),lead iodide(61.82.Rx),carbon-electrode(88.40.HJ)
更新于2025-09-23 15:21:01
-
Phase Distribution and Carrier Dynamics in Multiple-Ring Aromatic Spacers-Based Two-Dimensional Ruddlesden-Popper Perovskite Solar Cells
摘要： Two-dimensional (2D) perovskites with natural multi-quantum-well structure have been reported to offer better stability compared to 3D perovskites. However, the understanding of the exciton separation and transport mechanism in 2D perovskite as well as developing more efficient organic spacers remain considerable challenges as the 2D perovskite exhibit large exciton binding energy due to quantum confinement. Here, a class of multiple-ring aromatic ammoniums, 1-naphthalenemethylammonium (NpMA) and 9-anthracenemethylammonium (AnMA), were developed as spacers for 2D Ruddlesden-Popper (RP) perovskite solar cells (PSCs). In addition to significantly enhanced stability, the device based on (NpMA)2(MA)n-1PbnI3n+1 (average n = 4) exhibits a champion efficiency of 17.25% and a high open circuit voltage of 1.24 V. The outstanding photovoltaic performance could be ascribed to the ultrafast exciton migration (within 7 ps) from 2D phases to 3D-like phases, which were confirmed by charge carrier dynamics results, leading to efficient exciton separation, charge transportation and collection. This work facilitates understanding the working mechanism of 2D PSCs deeply and offers an efficient way to further boosting their efficiency and stability by developing multiple-ring aromatic spacers.
关键词： perovskite solar cell,organic spacer,phase distribution,charge transport,two-dimensional
更新于2025-09-23 15:21:01
-
Efficient Perovskite Solar Cells Via Surface Passivation by a Multifunctional Small Organic Ionic Compound
摘要： Surface passivation is a proven strategy for preparing high efficiency planar perovskite solar cells. Herein, we report an effective surface passivation strategy using the multifunctional small organic ionic compound 1-Ethylpyridinium chloride (EPC) in combination with (FAPbI3)0.95(MAPbBr3)0.05. It is found that the nitrogen atom in the pyridine group forms chemical bonds with under-coordinated lead ions in the perovskite film whereby the defect density is significantly reduced. The organic groups, including ethyl and pyridine, furthermore provide higher hydrophobicity for improved moisture stability. Finally, the chlorine anions were also found to play an important role in the defect passivation while further improving the perovskite crystallinity. Detailed theoretical study confirms that the EPC is indeed a good passivation agent for multiple defects. As a result, the power conversion efficiency is increased from 19.52% to as high as 21.19% via the EPC passivation and the devices show reduced hysteresis and increased stability.
关键词： 1-Ethylpyridinium chloride,surface passivation,multifunctional,perovskite solar cell,small organic ionic compound
更新于2025-09-23 15:21:01
-
Aqueous Sn-S Complex Derived Electron Selective Layer for Perovskite Solar Cells
摘要： A novel aqueous Sn-S complex solution was applied as precursor to fabricate SnO2 electron selective layers (ESLs) for the hybrid perovskite solar cells (PSCs). The tin and sulfur powder were directly dissolved in a (NH4)2S water solution to form Sn-S precursor. After depositon and annealing, the SnO2 film was formed, presenting as a low cost and enviromental friendly method for preparation of ESL. The films showed excellent transmittance at visible wavelength range. Moreover, the method exhibited high compatibility for doping using Cu, Cd, Li, and Zn elements. Zn doping (0.05 M) in the as-prepared SnO2 ESL significantly improved perovskite solar cells (PSCs) performance. The highest PCE of 13.17% was achived with 15% enhancement compared to that of undoped SnO2 ESL samples. TiCl4 modifications on SnO2 film improved photovoltaic performance to 14.45%, but resulted in the poor long-term stability, around 80% more degredation than that of PSCs based on Zn-doped SnO2 films.
关键词： SnO2,Sn-S complex,aqueous solution,perovskite solar cell,electron selective layer
更新于2025-09-23 15:21:01
-
Phenylhydrazinium Iodide for Surface Passivation and Defects Suppression in Perovskite Solar Cell
摘要： In recent years, hybrid perovskite solar cells (HPSCs) have received considerable research attention due to their impressive photovoltaic performance and low-temperature solution processing capability. However, there remain challenges related to defect passivation and enhancing the charge carrier dynamics of the perovskites, to further increase the power conversion efficiency of HPSCs. In this work, the use of a novel material, phenylhydrazinium iodide (PHAI), as an additive in MAPbI3 perovskite for defect minimization and enhancement of the charge carrier dynamics of inverted HPSCs is reported. Incorporation of the PHAI in perovskite precursor solution facilitates controlled crystallization, higher carrier lifetime, as well as less recombination. In addition, PHAI additive treated HPSCs exhibit lower density of filled trap states (1010 cm?2) in perovskite grain boundaries, higher charge carrier mobility (≈11 × 10?4 cm2 V?1 s), and enhanced power conversion efficiency (≈18%) that corresponds to a ≈20% improvement in comparison to the pristine devices.
关键词： surface passivation,defect suppression,additive material,perovskite,solar cell
更新于2025-09-23 15:21:01
-
From 1D to 3D: Fabrication of CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> Perovskite Solar Cell Thin Films from (Pyrrolidinium)PbI <sub/>3</sub> via Organic Cation Exchange Approach
摘要： A new crystal form of one-dimentional (1D) perovskite (pyrrolidinium)PbI3 is synthesized and characterized. The 1D perovskite has a good film formability by solution spin coating, and can be in situ transformed to three-dimensional (3D) CH3NH3PbI3 via organic cation exchange approach under CH3NH2 atmosphere, which is dense and uniform. The converted 3D perovskite film is employed as a light absorber, and the corresponding perovskite solar cell shows a power conversion efficiency of up to 19.2% under simulated one-sun AM 1.5G illumination (100 mW cm-2).
关键词： three-dimensional,one-dimensional,perovskite,solar cell,single crystal
更新于2025-09-23 15:21:01
-
Effect of Precursor Aging on Builta??In Potential in Formamidiniuma??Based Perovskite Solar Cells
摘要： Formamidinium-based perovskite with optimal bandgap and improved thermal stability is a promising active material for application in perovskite solar cells (PSCs). The hybrid precursor solutions, formed by adding various smaller cations, are often used for improving the phase stability in PSCs. In this work, we report the effort on understanding the aging effect of a methylammonium- and bromine-free formamidinium precursor solution on the performance of FA0.85Cs0.1Rb0.05PbI3-based PSCs. Our results reveal that deterioration in the built-in potential in the PSCs is closely associated with the formation of the secondary phase in the FA0.85Cs0.1Rb0.05PbI3 active layer. The formation of the secondary phase in the active layer is related to the hydrolysis of the precursor solution. The suppression of the moisture encroachment greatly enhances the durability of the precursor solution and performance reproducibility of the PSCs.
关键词： precursor solution aging,perovskite solar cell,secondary phase,built-in potential
更新于2025-09-23 15:21:01