Journal of Materials Chemistry C
·
2025
·
IF 5.1
Jiansen Wen,Ping Li,Linqin Jiang,Baisheng Sa,Hao Xiong,Lingyan Lin,Xiaokun Huang,Aijun Yang,Yu Qiu
Lead-free Cs3Cu2I5 perovskite, featuring a low-dimensional structure and self-trapped exciton emission, presents significant promise for sustainable optoelectronics. Although mechanical ball milling has the advantage of being environmentally friendly and scalable, the optoelectronic performance of synthesized Cs3Cu2I5 is often constrained by lattice distortion, surface defects, and particle agglomeration induced during milling. To overcome these challenges, an alkyl-chain-engineered passivation strategy derived from amino acids was proposed through a combined theoretical calculation and experimental validation approach. Density functional theory reveals that the multifunctional amino acid and alkyl chain synergistically passivate both the coordination-deficient Cu+ ions and iodine vacancies prone to deep-level defects on the Cs3Cu2I5 surface. Interestingly, the extended alkyl chain significantly enhances the modification effect. Subsequent experiments and calculations further confirmed that longer alkyl chains effectively enhance photoluminescence, prolong carrier lifetime, suppress aggregation, and improve grain compactness by interacting with multiple functional groups through hydrogen-bond networks, steric hindrance, and internal electric fields. It is worth highlighting that 5-AVA-modified Cs3Cu2I5 achieved a remarkable PLQY of 75.6% (a 56.8% enhancement), prolonged carrier lifetime by 12.6%, and significantly enhanced UV-region photoresponse. Furthermore, the photodetector fabricated with this molecularly engineered green perovskite exhibits a nearly fourfold and 171% improvement in PDRC and switching ratio, respectively. This theory-guided, alkyl-chain-engineered molecularly synergistic multi-functional-group passivation strategy establishes a robust framework for green synthesis of optoelectronically superior, eco-friendly lead-free copper-based perovskites.
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ACS Energy Letters
·
2026
·
IF 17.5
Jianhong Wu,Dongmin Qian,Xiuqin Yan,Yuxiao Cai,Fuyi Zhou,Yangyang Guo,Wei Zhu,Weiwei Lu,Ruishan Wang,Ziheng Zhou,Chao Ma,Yonghua Chen,Nana Wang,Yu Cao,Jianpu Wang
Perovskite light-emitting diodes (LEDs) are sensitive to the quality of the perovskite films, which typically require fabrication in inert atmospheres to avoid moisture-induced uncontrolled crystallization, thereby increasing manufacturing complexity and cost. Here, it is demonstrated that cesium iodide and zinc acetate suppress the formation of lead polyhalide intermediates and enable the rapid growth of three-dimensional perovskite in ambient air. This approach suppresses water-induced uncontrolled growth, leading to the formation of perovskite films with uniformly distributed grains and reduced trap density. With this approach, ambient-air-processed near-infrared perovskite LEDs with a peak external quantum efficiency of 20.2% and enhanced stability are demonstrated.
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CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Jianan Chen,Zhaobing Tang,Yangzhou Zhou,Ting Zhang,Lei Qian,Chaoyu Xiang
As an alternative method of the electron transport layer (ETL) of Zinc Oxide nanoparticles, an in-situ solution process was developed to prepare ZnO thin films for manufacturing perovskite light-emitting diodes (PeLEDs). After optimizing the processing conditions, the band energy and electron mobility are adjusted appropriately, which shows advantages to balance the carrier injection in PeLEDs. The near-infrared PeLEDs with ZnO film prepared by in-situ method demonstrated external quantum efficiency of 22%, which is compatible with their counterpart using ZnO nanoparticles. Our report provides a feasible strategy for the low-cost fabrication of PeLEDs with high performance.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 47
·1807696
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IF 15.621
Hongyu Xu,Yuanzhi Jiang,Tingwei He,Saisai Li,Huanhua Wang,Yu Chen,Mingjian Yuan,Jun Chen
Tin-based perovskites have exhibited high potential for efficient photovoltaics application due to their outstanding optoelectrical properties. However, the extremely undesired instabilities significantly hinders their development and further commercialization process. A novel tin-based reduced-dimensional (quasi-2D) perovskites is reported here by using 5-ammoniumvaleric acid (5-AVA + ) as the organic spacer. It is demonstrated that by introducing appropriate amount of ammonium chloride (NH 4 Cl) as additive, highly vertically oriented tin-based quasi-2D perovskite films are obtained, which is proved through the grazing incidence wide-angle X-ray scattering characterization. In particular, this approach is confirmed to be a universal method to deliver highly vertically oriented tin-based quasi-2D perovskites with various spacers. The highly ordered vertically oriented perovskite films significantly improve the charge collection efficiency between two electrodes. With the optimized NH 4 Cl concentration, the solar cells employing quasi-2D perovskite, AVA 2 FA n −1 Sn n I 3 n +1 (< n > = 5), as light absorbers deliver a power conversion efficiency up to 8.71%. The work paves the way for further employing highly vertically oriented tin-based quasi-2D perovskite films for highly efficient and stable photovoltaics.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yunhui Kuang,Yazhuo Xue,Zheng Zhang,Lvpeng Yang,Tong Bie,Rui Li,Wenxi Liang,Naigen Zhou,Ming Shao
Efficient and stable pure-red perovskite light-emitting diodes (PeLEDs) show great potential for high-definition displays. Despite significant advancements in device performance over recent years, achieving both high external quantum efficiency (EQE) and long-term stability remains a significant challenge. In this study, we employed 5-amino valeric acid (5-AVA) as a crystallization agent and utilized in situ analytical techniques, including X-ray diffraction, UV–visible spectroscopy, and photoluminescence, to explore its role in the crystallization kinetics of quasi-2D perovskite (POEA 0.7 NMA 0.3 ) 2 CsPb 2 I 7 films. Our results reveal that the strong coordination capability of 5-AVA with Pb 2+ ions promotes direct nucleation of perovskite phases and slows down crystal growth following a “rapid nucleation, slow growth” mechanism. This well-controlled crystallization kinetics leads to enhanced crystallinity, reduced defect density, and a narrower cascade phase distribution for quasi-2D perovskites. Ultimately, these improvements enable pure-red PeLEDs to achieve higher EQEs, increasing from 15.68 % to 21.23 %, and extending the operational lifetime, from 242 min to 506 min. Our research highlights the potential of precisely regulating crystallization kinetics to address the key challenges of phase impurity and non-radiative energy losses in quasi-2D PeLEDs, paving the way toward reliable and efficient PeLEDs.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Guolin Zhang,Runqing Lu,Ziping Liu,Kaijie Ni,Tao Jiang,Xiangru Tao,Guanhaojie Zheng,Chang Yi,Jianpu Wang
Perovskite multiple quantum wells (MQWs) have shown great potential in the field of light-emitting diodes (LEDs). However, the random formation of QWs with varying well widths (n numbers) often leads to suboptimal interface defects and charge transport issues. Here, we reveal that the crystallization sequence of bromide-based perovskite MQWs is large-n QWs preceding small-n QWs. With this insight, we prevent the crystallization of subsequent small-n QWs by reducing the crystallization rate, ultimately resulting in the crystallization of only n = 5 QWs. This reduction in the crystallization rate is achieved through the chemical interaction of dual additives with perovskite constituents. Additionally, the chemical interaction effectively passivates the uncoordinated lead ions defects. Consequently, pure-phase perovskite QWs with a high photoluminescence quantum efficiency of 75% are achieved. The resulting green LEDs achieve a peak external quantum efficiency of 17.1% and a maximum luminance of 29,480 cd m–2, which is attractive for full-color display applications of perovskites.
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PubMed
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jianfeng Du,Yongpeng Huang,Yikai Yun,Wenjie Wei,Sijie Jiang,Yinxiao Yang,Mengyu Chen,Cheng Li
The deposition of charge blocking layer (CBL) has been proved as an essential approach to improve the unbalanced charge injection and enhance the external quantum efficiency (EQE) of perovskite light-emitting diodes (PeLEDs). Nonetheless, in near-infrared (NIR) PeLEDs, the CBL covering on the typical ZnO electron transport layer (ETL) usually affects the deprotonation process and thereby decreases the crystallinity of perovskite film. In this work, we improve the performance of PeLEDs by atomic layer deposition (ALD) of an ultra-thin (0.43 nm) aluminum oxide (Al 2 O 3 ) CBL between the ETL ZnO and perovskite layer. This CBL improves the charge injection balance and optimizes the morphological and crystalline characteristics of perovskite film. The NIR PeLEDs achieve a peak EQE of 17.0 % with the optimal Al 2 O 3 CBL, representing a 25 % enhancement compared to the control device. In particular, with in-situ electroabsorption (EA) spectroscopy, we discover that the presence of interface permanent dipoles ascribed to the ultra-thin Al 2 O 3 CBL, facilitates the charge injection balance by greatly increasing the built-in potential and reducing the electron injection. Hence, this work paves a practical way to enhance the efficiency of NIR PeLEDs without influencing the deprotonation process.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-8
·
IF 15.7
Li Yajing,Meng Na,Xu Yutian,Yu Bufan,Liu Junhao,Cui Yuanhao,Wang Ziqiang,Ke Xinwu,Pan Tengfei,Min Xue,Chen Jiangshan,Ma Dongge,Chao Lingfeng,Hu Zhelu,Xia Yingdong,Guo Qingxun,Chen Yonghua,Huang Wei
Thermal-evaporated perovskite light-emitting diodes are highly promising for future display and lighting. However, multi-source co-evaporation faces challenges such as difficulty in regulating crystallinity, especially for red perovskite light-emitting diodes, whose external quantum efficiencies are still less than 2%. Here, we demonstrate a facile layer-by-layer thermal-evaporation strategy to fabricate high-quality perovskite-emitting films with tunable emission wavelengths. 5-Aminovaleric acid is introduced to regulate interfacial reactions during deposition, slow down crystallization during post-annealing, and passivate defects through coordination interactions. This approach yields perovskite emitting layers with high uniformity and luminance efficiency. As a result, red (670 nm) and deep-red (730 nm) perovskite light-emitting diodes achieve maximum external quantum efficiencies of 9% and 7.27%, and luminance of over 1500 cd m -2 and 200 W s -1 m -2 , respectively. Furthermore, large-area (2500 mm²) and patterned perovskite thin films and light-emitting diodes with outstanding uniformity are successfully demonstrated.
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ACS Nano
·
2025
·
IF 16
Jingjing Cao,Wenji Zhan,Meng Ren,Yao Wang,Haifei Wang,Ni Zhang,Yuetian Chen,Tianfu Wang,Yanfeng Miao,Yixin Zhao
The application of promising perovskite light-emitting diodes (PeLEDs) faces a significant challenge known as efficiency roll-off, which refers to the decline in external quantum efficiency (EQE) at high current densities. This issue arises mainly from high trap densities in perovskite films and imbalanced carrier injection, which limit improvements in brightness and stability of PeLEDs. Here, we develop a green solvent strategy using γ-valerolactone (GVL) to suppress efficiency roll-off in PeLEDs. This strategy effectively slows down the crystallization kinetics, yielding cubic-phase formamidinium lead triiodide (α-FAPbI3) films with reduced trap states, enhanced charge carrier injection, and suppressed Auger recombination. As a result, we achieve a record radiance of 1411 W sr–1 m–2 for GVL-based PeLEDs. These PeLEDs exhibit a substantially reduced efficiency roll-off, maintaining an EQE above 20% even at a high current density of 900 mA cm–2. Our findings highlight the potential of the green solvent approach for developing high-brightness, high-efficiency PeLEDs for practical applications.
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