Effect of sintering temperature on microstructure and electrical properties of Na0.5Bi0.47Sr0.02TiO3-δ ceramics DOI Creative Commons
Yuxin Ma,

Yunhe Wei,

Minghui Kong

et al.

Materials Research Express, Journal Year: 2024, Volume and Issue: 11(5), P. 055502 - 055502

Published: April 23, 2024

Abstract In this investigation, a series of Na 0.5 Bi 0.47 Sr 0.02 TiO 3- δ samples, sintered from 1000 to 1100 °C, were synthesized utilizing the solid-state method. The XRD results indicate that all samples exhibit perovskite phase, with exception those at which display no discernible impurity peaks. SEM average grain size exhibits an increase proportionate sintering temperature, attributes variations in actual Na/Bi ratio. From study conductivity we can obtain dominant factor affecting is activation energy. At oxygen vacancy concentration emerges as primary determinant conductivity. It should be noticed phase transition temperature sample increases (350 °C→400 °C) due local A-site disorder aggravated by high sintering. Therefore, reducing beneficial improve boundary initially rises, then diminishes increasing temperature. evident enhanced macroscopic stems marked reduction space charge potential within 1000–1025 °C range. Within 1050 °C−1100 range, barely changed, significant decrease intrinsic attributed surge coverage ratio impurities and number increased caused rapid area thermal evaporation. research on electrical performance NBT-based oxygen-ion conductors will promote application ion solid oxide fuel cells, sensors other fields.

Language: Английский

Developments of Highly Efficient Perovskite Solar Cells DOI
Fei Ma, Yang Zhao, Zihan Qu

et al.

Accounts of Materials Research, Journal Year: 2023, Volume and Issue: 4(8), P. 716 - 725

Published: July 21, 2023

ConspectusAfter developments in just more than a decade, the power conversion efficiency (PCE) of single junction perovskite solar cells (PSCs) has achieved record 26.0%. Such rapid progress PSCs technology is mainly attributed to excellent optoelectronic properties and facile solution-processed fabrication. Starting from birth up present, various methods have been attempted improve performance and/or stability PSCs. The first photovoltaic devices very low efficiency, poor quality film upon mesoporous substrate. There then are large amounts work aiming at high-quality light-absorber films with pin-free, dense, homogeneous morphology high crystallinity. Hereafter, carrier transport materials/layers (CTLs) based on different device structures had become an important issue. stable CTLs electrical matched energy levels desired for efficient Besides growth control employment advanced CTLs, main studies mitigation all kinds defects PSCs, including charge traps bulk, interface between adjacent grain boundaries located dangling bonds as well halide loss defects. All these can not only cause nonradiation recombination but also provide extra pathway ionic migration, which leads irreversible degradation film. And current trying push industrial application, since long-term high-efficiency count same importance apparent fact that literature about PSC fabrication experiment conditions, gives it reproducibility. Herein, conception motivation valuable. It necessary share research detail by individual laboratories better communication this rapidly developed field. could be concluded there three steps achieve such appreciable stability: 1) modulation quality; 2) development PSCs; 3) bulk interfaces. basic track In Account, we will briefly review milestones early period Then, focus our group coauthors' representative following above order technology. mechanisms motivations improved stages discussed. Finally, comprehensive summary deep perspectives proposed. future directions practical application

Language: Английский

Citations

57
High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering DOI Creative Commons
Chao Shen,

Shuyan Fang,

Jibin Zhang

et al.

Advanced Photonics, Journal Year: 2024, Volume and Issue: 6(02)

Published: Feb. 26, 2024

Despite the rapid advances of red and green perovskite light-emitting diodes (PeLEDs), achieving high brightness with external quantum efficiency (EQE) remains a challenge for pure-blue PeLEDs, which greatly hinders their practical applications, such as white-light illumination in optical communication high-speed low-loss light source. Herein, we report high-performance PeLED based on mixed-halide quasi-2D perovskites incorporated zwitterionic molecule 3-(benzyldimethylammonio) propanesulfonate (3-BAS). Experimental density functional theory analysis reveals that 3-BAS can simultaneously eliminate non-radiative recombination loss, suppress halide migration, regulate phase distribution smoothing energy transfer perovskites, leading to final photoluminescence yield robust spectrum stability. Thus, recorded 1806 cd m−2 relative higher EQE 9.25% is achieved, successfully demonstrated visible system voice signal transmission. We pave way highly efficient PeLEDs great application potential future networks.

Language: Английский

Citations

18
Highly Stable and Efficient Formamidinium‐Based 2D Ruddlesden–Popper Perovskite Solar Cells via Lattice Manipulation DOI Creative Commons

Fang Zeng,

Weiyu Kong,

Yuhang Liang

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(42)

Published: Sept. 6, 2023

Formamidinium (FA)-based 2D perovskites have emerged as highly promising candidates in solar cells. However, the insertion of spacer cations into perovskite lattice concomitantly introduces microstrain and unfavorable orientations that hinder efficiency stability. In this study, by finely tuning FA-based through cation engineering, a stable structure with balanced distortion, relaxation, reduced carrier-lattice interactions is achieved. These advancements effectively stabilize inherently soft against light thermal-aging stress. To reduce photocurrent loss induced undesired crystal texture, polarity-matched molecular-type selenourea (SENA) additive further employed to modulate crystallization kinetics. The introduction SENA significantly inhibits disordered drives templated growth quantum well vertical orientation. This controlled process reduces defects enhances charge separation. Ultimately, optimized photovoltaic devices achieve remarkable power conversion (PCE) 20.03% (certified steady-state 19.30%), setting new record for low-n Furthermore, exhibit less than 1% degradation after operating at maximum point 1000 h maintain excellent stability thermal aging cycles cold-warm shock, respectively.

Language: Английский

Citations

24
Energy-Efficient Perovskite LEDs with Rec. 2020 Compliance DOI
Shiyu Xing,

Yucai Yuan,

Gan Zhang

et al.

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(8), P. 3643 - 3651

Published: July 3, 2024

Perovskite LEDs (PeLEDs) show promise as a next-generation light source. For energy-efficient displays, PeLEDs with all-rounded performance combining high energy-conversion efficiencies (ηECE), brightness, and stability spectral compliance are required. However, such demanding goal is yet to be achieved. Here we demonstrate exhibiting ηECE of 21.3%, exceptional brightness ∼3.2 × 105 cd m–2 (max: ∼4.6 m–2), long lifetimes (T50) ∼125 h at 1000 (extrapolated T50: ∼4900 100 an unprecedented Rec. 2020 color gamut coverage 97.7% for green LEDs. The values record-high visible PeLEDs, contrasting most studies in which EQEs rather than the overall considered. We present how (i) tuning compliance, (ii) elimination nonradiative traps enhanced EQEs, stability, (iii) low driving voltages simultaneously achieved, paving way toward PeLED displays.

Language: Английский

Citations

14
Room temperature circularly polarized emission in perovskite nanocrystals through bichiral-molecule-induced lattice reconstruction DOI
Chenlu He, Jian Qiu, Zhen Mu

et al.

Matter, Journal Year: 2024, Volume and Issue: 7(2), P. 475 - 484

Published: Jan. 11, 2024

Language: Английский

Citations

13
Ordered Phase Distribution of Quasi‐2D Perovskites Controlled by a Supramolecular Approach Enables Efficient Blue Light‐Emitting Diodes DOI
Shichen Yuan, Tao Fang,

Boning Han

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(25)

Published: Feb. 21, 2024

Abstract Quasi‐2D perovskites demonstrate exceptional luminescent properties, mainly attributed to heightened radiative recombination facilitated by the energy transfer process among spontaneous quantum‐well structures featuring varied n‐value distributions. However, rapid crystallization often induces uncontrolled variations in phase composition, characterized distinct “n” values, leading suboptimal efficiency. In this study, an innovative supramolecular strategy utilizing cryptand is introduced as additive regulate distribution within quasi‐2D perovskite films. Cryptand effectively inhibited aggregation of PEA + and formation unsaturated Pb‐X coordination compounds, thereby suppressing generation low‐“n” phases. This intervention resulted a continuous series ordered intermediate phases with higher values. The graded electronic structure efficient from high‐“n” phases, promoting effective radiation recombination. As result, optimized PeLEDs emitting at 490 nm demonstrated remarkable external quantum efficiency (EQE) enhancement 10.16%, compared reference device EQE 2.33%. also exhibited impressive spectral operational stability. findings establish viable for precise regulation perovskites, offering great potential high‐performance blue PeLEDs.

Language: Английский

Citations

13
Polycrystalline Lead-Free Perovskite Direct X-Ray Detectors with High Durability and Low Limit of Detection via Low-Temperature Coating DOI
Bo Zhao, Huiwen Chen, Ziyao Zhu

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(5), P. 6113 - 6121

Published: Jan. 25, 2024

Direct X-ray detectors represent a transformative technology in the realm of radiography and imaging. The double halide-based perovskite cesium silver bismuth bromide (Cs

Language: Английский

Citations

8
Suppressing Fluoride Segregation for High Efficiency Tin Perovskite Solar Cells DOI
Mingyu Ma, Xianyuan Jiang, Zihao Zang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: July 16, 2024

Abstract Phase segregation can bring low crystallinity and orientation, giving rise to poor carrier transport high defect density, leading device performance. In order reduce oxidation density regulate film growth, lots of reductive additives such as SnF 2 are explored in tin perovskite growth. Despite the is effectively reduced, it induces phase segregation. Herein, a molecule NH 5 F with bi‐fluoride anion address this challenge for solar cells. This reduces coordination energy Sn 2+ compared , hence byproduct [F─H─F] − be eliminated during annealing process, preventing fluoride As result, highly oriented reduced fabricated. The shows recombination, improved current density. Consequently, tin‐based cell an efficiency 15.04% fabricated, ranking one highest efficiencies reported up now.

Language: Английский

Citations

5
Understanding the Correlation between the Crystallization Kinetics and Defect Formation in (FA)1.5Cs0.5AgBi(Cl0.75Br0.25)6 Double Perovskites DOI
Tejas Dhanalaxmi Raju, Ho‐Jin Lee,

Vignesh Murugadoss

et al.

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(2), P. 468 - 477

Published: Jan. 17, 2024

Double perovskites, particularly Cs2AgBiCl6, have attracted substantial attention as promising alternatives to lead-halide perovskites because they are environmentally friendly. However, the integration of these double into light-emitting diodes (LEDs) remains challenging their poor performance, which is primarily attributed a limited understanding correlation between crystallization and defect formation. In this study, deep-trap defects caused by B-site antisites vacancies introduced perovskite formamidinium (FA)1.5Cs0.5AgBi(Cl0.75Br0.25)6 lattice during crystallization. Remarkably, valeric acid suppresses facilitates formation distinct nanocrystals with structurally ordered perovskite. Poly(ethylene oxide) encapsulates in situ passivates surface modifying grain boundaries. manner, coadditive strategy boosts performance double-perovskite-based deep blue LED record external quantum efficiency 1.8% peak luminance 280 Cd/m2. This study significantly advances our provides new perspectives for future investigations.

Language: Английский

Citations

4
Enhanced Optoelectronic Performance of Blue Quasi-2D Perovskite Light-Emitting Diodes Enabled by Diammonium-Functionalized Spacer DOI

Chang Tan,

Li Song, Z. Y. Ge

et al.

Journal of Luminescence, Journal Year: 2025, Volume and Issue: unknown, P. 121124 - 121124

Published: Feb. 1, 2025

Language: Английский

Citations

0