- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Reducing Photovoltage Loss in Inverted Perovskite Solar Cells by Quantum Dots Alloying Modification at Cathode Contact
摘要： The tremendous passion for inverted planar heterojunction perovskite solar cells (PSCs) is originated from their great tendency in the Roll-to-Roll process compatible fabrication and huge potential for integration into tandem solar cells. But the device efficiency is still lower than regular structured PSCs. Engineering of the cathode interface to efficiently control and reduce VOC loss light a lamp for increasing electrochemical properties and boosting overall performance. In this work, a simple interfacial modification strategy was developed by introducing a hybrid ligands interfacial layer to reduce VOC loss in PSCs with inverted planar structure. Heavily washed QDs was used as a neutral charged intermedia to enable alloying reaction to transfer ligands without damage perovskite. A band bending immediately generated on top surface of perovskite film after QDs modification, which was directly convinced by UPS and KPFM. This contributed to ~50 mV reduced VOC loss, leading to a VOC of 1.15 V and a PCE of 20.6% in inverted PSCs. Meanwhile, enhanced stability achieved for these devices after QDs modification, in which PCE keeping > 90% of initial value after 1000 hours' storage.
关键词： inverted planar heterojunction perovskite solar cells,perovskite quantum dots,photovoltage,electron transport layer,passivation
更新于2025-09-12 10:27:22
-
Novel approach to passivation of InAs/GaSb type II superlattice photodetectors
摘要： The innovative two-step passivation by octadecanethiol (ODT) self-assembled monolayers (SAMs) and the following silicon dioxide (SiO2) deposition was used for the type-II InAs/GaSb superlattice photodetector. To understand the mechanism of passivation, the (100) GaSb surface covered with the ODT and, for comparison, with the biphenyl thiol (BPT), was characterized by the atomic force microscopy, Raman spectroscopy and contact angle analysis. The results of the study indicated the presence of the homogeneous both the ODT and the BPT monolayers; however, the ODT SAMs were more stable. Therefore, the ODT-based wet treatment was used in the two-step passivation resulting in a reduction of the dark current by one order of magnitude for passivated detector compared with an unpassivated device.
关键词： ODT,SiO2,InAs/GaSb superlattice,BPT,photodetectors,passivation
更新于2025-09-12 10:27:22
-
A high-efficiency and stable cupric oxide photocathode coupled with Al surface plasmon resonance and Al <sub/>2</sub> O <sub/>3</sub> self-passivation
摘要： The key to achieving high performance in photoelectrochemical (PEC) water splitting is the design of e?cient and stable photoelectrode structures. Herein, we firstly synthesized a novel and high-photoactivity CuO/Al photocathode and then the Al2O3 passivation layer was further introduced through a spontaneous oxidation process in air to protect the photocathode against photocorrosion. On account of the localized surface plasmon resonance (LSPR) of Al nanoparticles (NPs) in conjunction with surface passivation of the Al2O3 layer, the obtained CuO/Al/Al2O3 photocathode exhibits a high photocurrent density of (cid:2)0.95 mA cm(cid:2)2 at (cid:2)0.55 V vs. Ag/AgCl and photocorrosion stability of 89.5% after 1 h.
关键词： water splitting,localized surface plasmon resonance,CuO,Al2O3 passivation layer,photoelectrochemical,Al nanoparticles
更新于2025-09-12 10:27:22
-
Alkali metal ions passivation to decrease interface defects of perovskite solar cells
摘要： Charge carrier recombination occurring in the interface has become a major hindrance impairing the efficiency and stability of perovskite solar cells (PSCs). Passivation of electronic defects at the surface and grain boundaries is one of the most important strategies to suppress charge recombination and improve crystallization in PSCs. Herein, sodium sulfate (Na2SO4) passivation layer was incorporated into the TiO2/perovskite interface to improve charge transfer. Compared to the devices without Na2SO4, the device with the optimized concentration of Na2SO4 solution exhibits an increased short-circuit current density of 22.83 mA/cm2 and an enhanced fill factor of 73.68%, yielding an increased power conversion efficiency from 15.20% to 18.75%. The efficiency improvement is attributed to the decreased defects and traps as well as the enhanced film crystallization quality.
关键词： Perovskite solar cells,Passivation layer,Surface defects,Charge recombination
更新于2025-09-12 10:27:22
-
Observing the Defect Passivation of Grain Boundary?with 2‐Aminoterephthalic Acid for Efficient and Stable Perovskite Solar Cells
摘要： Metal halide perovskite solar cells (PSCs), with their exceptional properties, hold potential as photoelectric converters. However, defects in the perovskite layer, particularly at the grain boundaries (GBs), seriously restrict the performance and stability of PSCs. Herein, we present a simple post-treatment procedure by applying 2-aminoterephthalic acid to the perovskite to produce efficient and stable PSCs. By optimizing the post-treatment conditions, we created a device that achieved a remarkable power conversion efficiency (PCE) of 21.09% and demonstrated improved stability. This improvement was attributed to the fact that the 2-aminoterephthalic acid acted as a cross-linking agent that inhibited the migration of ions and passivated the trap states at GBs. These findings provide a potential strategy for designing efficient and stable PSCs regarding the aspects of defect passivation and crystal growth.
关键词： passivation,Solar cell,interface,defect,perovskite
更新于2025-09-12 10:27:22
-
High-Performance Perovskite Light-Emitting Diode with Enhanced Operational Stability Using Lithium Halide Passivation
摘要： Defect passivation has been demonstrated to be effective in improving the radiative recombination of charge carriers in perovskites, and consequently device performance of the resultant perovskite light-emitting diodes (LEDs). State-of-the-art useful passivation agents in perovskite LEDs are mostly organic chelating molecules, which, however, simultaneously sacrifice the charge transport properties and thermal stability of the resultant perovskite emissive layers, deteriorating the performance especially the operational stability of the devices. In this work, we demonstrate that lithium halides can efficiently passivate defects of halide vacancies and reduce trap state density, suppressing ion migration in perovskite films. Efficient green perovskite LEDs based on all inorganic CsPbBr3 perovskite with a peak external quantum efficiency of 16.2% as well as a high maximum brightness of 50278 cd m-2 are achieved. In addtion, the device shows decent stability even under a brightness of 104 cd m-2. We highlight the universal applicability of defect passivation using lithium halides, which enable us to improve the efficiency and stability of blue and red perovskite LEDs.
关键词： passivation,lithium halide,surface defects,stability,non-radiative
更新于2025-09-12 10:27:22
-
Observing the Defect Passivation of Grain Boundary?with 2-Aminoterephthalic Acid for Efficient and Stable Perovskite Solar Cells
摘要： Metal halide perovskite solar cells (PSCs), with their exceptional properties, hold potential as photoelectric converters. However, defects in the perovskite layer, particularly at the grain boundaries (GBs), seriously restrict the performance and stability of PSCs. Herein, we present a simple post-treatment procedure by applying 2-aminoterephthalic acid to the perovskite to produce efficient and stable PSCs. By optimizing the post-treatment conditions, we created a device that achieved a remarkable power conversion efficiency (PCE) of 21.09% and demonstrated improved stability. This improvement was attributed to the fact that the 2-aminoterephthalic acid acted as a cross-linking agent that inhibited the migration of ions and passivated the trap states at GBs. These findings provide a potential strategy for designing efficient and stable PSCs regarding the aspects of defect passivation and crystal growth.
关键词： passivation,Solar cell,interface,defect,perovskite
更新于2025-09-12 10:27:22
-
SnO2 surface defects tuned by (NH4)2S for high-efficiency perovskite solar cells
摘要： Tin oxide (SnO2) is widely adopted as an electron transport layer (ETL) in perovskite solar cells (PSCs). However, the oxygen vacancies of the SnO2 not only are the trap states of the nonradiative recombination of photo-generated carriers, but also build the potential barrier of carrier transport. To solve this issue, ammonium sulfide [(NH4)2S] is introduced to the SnO2 precursor for passivating the surface defects by terminating the Sn dangling bonds (S–Sn bonds). After reducing the surface traps, the electron mobility and conductivity of SnO2 film are enhanced significantly while the carrier recombination is decreased. Additionally, the energy level of S-SnO2 is also slightly modified. Therefore, this sulfide-passivated mothed remarkably improves the electron collection efficiency of the ETL. Furthermore, the linkage of Sn–S–Pb anchors the perovskite crystals at the perovskite/SnO2 interface, which increases the electron extraction efficiency and the stability of PSC. Based on this S-SnO2 ETL, the power conversion efficiency of the PSC is greatly promoted from 18.67% to 20.03%, compared with the reference one. In this study, it is proven that the surface defect passivation of SnO2 is an efficient and simple method to improve the photovoltaic performance, as a promising ETL for high-efficiency device.
关键词： Oxygen vacancy,Carrier transport dynamic,SnO2 electron transport layer,Surface passivation,Perovskite solar cells
更新于2025-09-12 10:27:22
-
Phenyl-C <sub/>61</sub> -Butyric Acid as an Interface Passivation Layer for Highly Efficient and Stable Perovskite Solar Cells
摘要： Here phenyl-C61-butyric acid (PCBA) is presented as a generic passivation coating for metal oxide electron transport layers used in planar n-i-p configuration of perovskite solar cells (PSC). PCBA shows better adhesion to tin and zinc oxides due to strong acid-base interactions as compared to the conventionally used phenyl-C61-butyric acid methyl ether (PCBM). Therefore, depositing a compact PCBA passivation coating can be achieved in a much more economical way using 100 times less concentrated precursor solution. In addition, PCBA coating delivers higher power conversion efficiencies (up to 20.3%) as compared to the pristine oxide layers with or without PCBM coating. Finally, the fabricated solar cells using PCBA coating are more stable in comparison with the reference cells with conventional PCBM passivation and preserved ~70% of the initial efficiency after 1500 h of continuous 30 mW/cm2 white light illumination at 50?C.
关键词： electron transport layers,stability,perovskite solar cells,phenyl-C61-butyric acid,interface passivation
更新于2025-09-12 10:27:22
-
Visualizing and Suppressing Nonradiative Losses in High Open-Circuit Voltage n-i-p-Type CsPbI <sub/>3</sub> Perovskite Solar Cells
摘要： Since their first demonstration in PV devices in 2009, organic-inorganic hybrid metal halide perovskites have attracted tremendous attention because of their potential applications in solution-processed photovoltaics (PV). Many research efforts, such as composition engineering and interface engineering, have been dedicated to enhancing the power conversion efficiency (PCE) of perovskite-based solar cells (PSCs) to a high level of over 24%. However, operational stability issues remain a major challenge for organic-inorganic hybrid perovskites on the way towards commercialization. Alternatively, all-inorganic perovskites (CsPbX3, X = Cl, Br, I), have received increasing interest because they are theoretically stable up to their melting points (>300 °C). Especially, CsPbI3 in the cubic phase stands out because of the lowest bandgap (of ~1.75 eV) among the all-inorganic lead-based perovskites. Compared to all other all-inorganic lead-based perovskite halide semiconductors materials which have bandgaps higher than 1.90 eV, the 1.75 eV bandgap CsPbI3 is able to absorb slightly more light in the visible region and nominally is an excellent candidate for the front cell in tandem architectures with silicon as the back cell.
关键词： open-circuit voltage,CsPbI3,perovskite solar cells,interface engineering,non-radiative losses,bulk passivation
更新于2025-09-12 10:27:22