- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Efficiency improvement of planar inverted perovskite solar cells by introducing F8BT into PTAA as mixed hole transport layer
摘要： Hole-transport layer (HTL) is a crucial component to influence the crystallization of the perovskite layer which has close photovoltaic efficiency and stability of perovskite relationship with the photovoltaic efficiency and stability of perovskite solar cells (PVSCs). In this work, planar inverted PVSCs employing polytriarylamine (PTAA) HTL mixed with a polymeric material of poly(9,9-dioctyfluorene-co-benzothiazole) (F8BT) are fabricated, and the effect of mixed polymer HTL on the device performance was investigated. After the variation of the F8BT ratio in the mixed HTL, the average power conversion efficiency (PCE) of 14.88 % with negligible hysteresis was achieved and the champion device exhibits a PCE of 15.41 % due to the increased charge carrier extraction and optimized crystallization properties of perovskite. Unsealed planar p-i-n PVSCs with mixed polymer HTL show a 28.8 % incensement in average PCE (14.88 % vs 11.55 %) and over 30 % enhancement in stability at ambient condition for two weeks with respect to control due to the improvement in the crystallinity of perovskite layer and conductivity of polymer layer. This work provides an effective strategy for the development of highly efficient planar PVSC fabricated on mixed polymer HTL.
关键词： Planar perovskite solar cell,F8BT,PTAA,Mixed polymer HTL,Efficiency improvement
更新于2025-09-12 10:27:22
-
High Efficiency Perovskite Solar Cells: Materials and Devices Engineering
摘要： Since the first report on 9.7% efficient solid-state perovskite solar cell (PSC) in 2012, perovskite photovoltaics received tremendous attentions. Efforts to increase power conversion efficiency (PCE) have been continuously made. As a result, a record PCE of 25.2% was certified in 2019, which surpassed those achieved from the conventional solar cells based on CIGS and CdTe. The superb photovoltaic performance of PSC is related to the defect-tolerant property, the long carrier lifetime, the long diffusion length of photo-generated carriers, and the high absorption coefficient. In this review, materials and devices engineering are described for achieving stability and higher PCE in PSCs. From the practical point of view, key technologies for materials, coating, and device fabrication are described, which is expected to be helpful to achieve high efficiency PSCs. Moreover, interfacial engineering methodologies toward hysteresis-less and stable PSCs are also presented to give insight into better understanding ion migration and recombination in PSCs.
关键词： Solid-state,Perovskite solar cell,High efficiency,Hysteresis-less,Interfacial engineering,Stability,Coating
更新于2025-09-12 10:27:22
-
Position effect of arylamine branches on pyrene-based dopant-free hole transport materials for efficient and stable perovskite solar cells
摘要： In this work, arylamine branches N4-[4-[Bis(4-methoxyphenyl)-amino]phenyl]-N1,N1-bis(4-methoxyphenyl)-1,4-benzenediamine are introduced to the 1,6- and 2,7-positions of pyrene core to afford two novel HTMs coded PYR16 and PYR27. The influence of different positions of arylamine units on the optical and electronic properties and the performance of PSCs are investigated. The perovskite solar cells (PSCs) using dopant-free PYR16 exhibite a PCE of 17.00%, which is higher than that of PYR27 (14.67%). Furthermore, the PSCs based on PYR16 obtain better stability than those using PYR27 by maintaining 98% of the initial values after 1080 h at 80 ℃ in an ambient environment in the dark and 85% of initial values after 672 h under continuous sunlight soaking in an ambient environment at 45-50 ℃.
关键词： perovskite solar cell,position effect,stability,hole transport material,pyrene
更新于2025-09-12 10:27:22
-
Green low-temperature-solution-processed in situ HI modified TiO2/SnO2 bilayer for efficient and stable planar perovskite solar cells build at ambient air conditions
摘要： Planar structures for halide perovskite solar cells with the high efficiencies typically use high-temperature processed TiO2 as the electron transporting layers (ETLs). Here, we demonstrate that an in-situ passivation strategy for TiO2 film through the introduction of HI during low-temperature preparation process. HI not only controls hydrolysis of TiO2 precursor but also eliminates defects and suppresses trap states in TiO2 film. Meanwhile, the double-layer architecture is constructed by coating TiO2 with SnO2 layer, the double ETLs can improve the photovoltaic performance of methylamine lead iodide (MAPbI3) perovskite solar cells. The TiO2(HI)/SnO2 ETL can effectively reduce the interfacial charge recombination and facilitate electron transfer. More importantly, the preparation of TiO2 and SnO2 are totally performed at low-temperature (150 °C) and the devices are fabricated in uncontrolled ambient conditions. Our best-performing planar perovskite cell using such a TiO2(HI)/SnO2 ETL has achieved a maximum power conversion efficiency (PCE) of 16.74%, and the devices exhibit good stability which maintaining 85% and 83% of their initial efficiency after heating at 100 °C for 22 h and under illuminating upon 1 sun irradiation for 6 h, respectively. Our results suggest a new approach for further improving the stability of PSCs fabricated in the air condition.
关键词： perovskite solar cell,electron transfer layer,ambient condition,TiO2/SnO2
更新于2025-09-12 10:27:22
-
Acetate based Crystallization Kinetics Modulation of CsPbI2Br for Improved Photovoltaic Performance
摘要： Inorganic CsPbI2Br perovskite has emerged to be a promising candidate for photovoltaic materials, while developing additives engineering strategies to address the issues of defects induced crystalline phase transformation from photoactive perovskite phase to non-perovskite phase has been a challenge to achieve their outstanding optoelectronic properties and thermal stability. In this work, we demonstrate an effective acetate mediation strategy for significantly retarding the crystallization process and thus the phase transformation, which leads to much improved optoelectronic performance of the solar cells. It was demonstrated that the addition of acetate like Cobalt(II) acetate (Co(Ac)2) or zinc acetate (Zn(Ac)2) could lead to significantly retarded crystallization process of perovskite films, as well as the formation of the flat, dense and defect-less perovskite film. We propose that the perovskite crystal grows up following the ostwald ripening mechanism at 270 ℃ annealing temperature, during which the acetate in the perovskite film would be squeezed from boundaries by grains growing cause the acetate cannot through the crystalline. Based on the proposed strategy of crystallization kinetics modulation with acetate, the photon conversion efficiency (PCE) of champion device with that acetate modified perovskite film can reach as high as 15.04%, and superb fill factor of 80.46%. We thus believe that our work could provide an effective alternative for the designing of high performance inorganic CsPbI2Br perovskite solar cells.
关键词： Acetate,CsPbI2Br,All-inorganic perovskite solar cell,Photo-conversion efficiency,Crystallization kinetics
更新于2025-09-12 10:27:22
-
Light Intensity-dependent Variation in Defect Contributions to Charge Transport and Recombination in a Planar MAPbI3 Perovskite Solar Cell
摘要： We investigated operation of a planar MApbi3 solar cell with respect to intensity variation ranging from 0.01 to 1 sun. Measured J-V curves consisted of space-charge-limited currents (SCLC) in a drift-dominant range and diode-like currents in a diffusion-dominant range. The variation of power-law exponent of SCLC showed that charge trapping by defects diminished as intensity increased, and that drift currents became eventually almost ohmic. Diode-like currents were analysed using a modified Shockley-equation model, the validity of which was confirmed by comparing measured and estimated open-circuit voltages. Intensity dependence of ideality factor led us to the conclusion that there were two other types of defects that contributed mostly as recombination centers. At low intensities, monomolecular recombination occurred due to one of these defects in addition to bimolecular recombination to result in the ideality factor of ~1.7. However, at high intensities, another type of defect not only took over monomolecular recombination, but also dominated bimolecular recombination to result in the ideality factor of ~2.0. These ideality-factor values were consistent with those representing the intensity dependence of loss-current ratio estimated by using a constant internal-quantum-efficiency approximation. The presence of multiple types of defects was corroborated by findings from equivalent-circuit analysis of impedance spectra.
关键词： perovskite solar cell,charge transport,defect contributions,recombination,light intensity-dependent variation
更新于2025-09-12 10:27:22
-
Thickness measurement of multilayer film stack in perovskite solar cell using spectroscopic ellipsometry
摘要： The rapid surge in perovskite solar cell efficiency has necessitated the development of viable metrology techniques during device integration, paving the way for commercialization. Ellipsometry is considered the most appropriate technique for fast and accurate thickness measurement for large scale production. However, a precise and well-calibrated model is a prerequisite for this technique. While ellipsometry of individual device layers has been reported in recent perovskite literature, a comprehensive multilayer modeling approach is thus far unavailable. Perovskite optoelectronic devices generally consist of a six-layer film stack with three transparent layers required for optical absorption in the perovskite layer. Spin casted thin films, now common in this line of research, impart their own difficulties into ellipsometric modeling. Roughnesses at each heterointerface, similarities in optical spectra of transparent layers, and anomalous dispersion of perovskite are just a few of such challenges. In this work, we report the process of building an ellipsometry model from scratch for thickness measurement of methylammonium lead iodide (MAPI) perovskite and indium tin oxide (ITO)/hole transport layer (HTL) bilayer thin film stacks on a glass substrate. Three promising representatives of HTLs (CuI, Cu2O, and PEDOT:PSS) were studied. The models were extended to measure the individual layer thicknesses of the MAPI/HTL/ITO film stack on a glass substrate using the models developed for individual layers. Optical constants of all the representative thin films were thus extracted for a wide wavelength range (300 nm–900 nm).
关键词： perovskite solar cell,spectroscopic ellipsometry,multilayer film stack,optical constants,thickness measurement
更新于2025-09-12 10:27:22
-
Low-temperature preparation of crystallized graphite nanofibers for high performance perovskite solar cells
摘要： Integration of two-dimensional graphite nanosheets into one-dimensional graphite nano?bers is essential for deep application of graphite materials. Here, we report preparation of crystallized graphite nano?bers by nozzle-less electrospinning and subsequent low-temperature heat treatment (500 °C). Depending on this graphitized one-dimensional nanostructure, we ?rst apply the graphite nano?bers as sca?old for perovskite solar cells (PSCs), which would provide a charge transfer highway in the light absorb layer and then improve the performance of devices. A high power conversion e?ciency of 18.23% was recorded for the graphite nano?bers based PSC with high ?ll factor of 76%.
关键词： Perovskite solar cell,Charge transfer,Electrospinning,Graphite nano?bers,Graphitization temperature
更新于2025-09-12 10:27:22
-
Evaluation of covalently linked (bacterio)chlorin-fullerenes as components for organic solar cells
摘要： A series of (bacterio)chlorophyll derivatives covalently linked with fullerenes were synthesized to explore their potential as donor–acceptor conjugates to organic solar cells (OSCs). Their physical properties and photovoltaic performances were investigated and compared with (bacterio)chlorins without fullerenes. A weak intramolecular interaction between the (bacterio)chlorin chromophore and the fullerene unit(s) was observed in their electronic absorption spectra in solution, and efficient fluorescence quenching occurred in their monomeric states. All the (bacterio)chlorin-fullerene conjugates worked as components for single material OSCs and the best power conversion efficiency of 0.62% with Jsc = 1.59 mA cm-2, Voc = 0.81 V, and FF = 0.48 was achieved for chlorin-C3-methyl phenyl-C61-butylate, DA-2.
关键词： perovskite solar cell,fullerene,tetrapyrrole,photovoltaics,dyad
更新于2025-09-12 10:27:22
-
Anti‐Oxidizing Radical Polymer‐Incorporated Perovskite Layers and their Photovoltaic Characteristics
摘要： A small amount of a radical-bearing redox-active polymer, poly(1-oxy-2,2,6,6-tetramethylpiperidin-4-yl methacrylate) (PTMA), incorporated into the photovoltaic organo-lead halide perovskite layer significantly enhanced durability of both the perovskite layer and its solar cell even exposure to ambient air or oxygen. The radical PTMA polymer acted as an eliminating agent of the superoxide anion radical formed upon light-irradiation on the layer, which can react with the perovskite compound and decompose it to lead halide. A cell fabricated with the PTMA-incorporated perovskite layer and a hole-transporting polytriarylamine layer gave a photovoltaic conversion efficiency of 18.8 % (18.2 % for the control without PTMA). The photovoltaic current was not reduced in the presence of PTMA in the perovskite layer probably owing to a carrier conductivity of PTMA. The incorporated PTMA also worked as a water-repelling coating for the organo-lead halide perovskite layer, providing humidity-resistance to their.
关键词： perovskite solar cell,nitroxide radical,organo-lead halide perovskite,redox polymer,anti-oxidizing agent
更新于2025-09-11 14:15:04