Nature Communications
·
2020
·Vol. 11
·期 1
·1-12
·
IF 12.121
Xu Leimeng,Li Jianhai,Cai Bo,Song Jizhong,Zhang Fengjuan,Fang Tao,Zeng Haibo
Perovskite quantum-dot-based light-emitting diodes (QLEDs) possess the features of wide gamut and real color expression, which have been considered as candidates for high-quality lightings and displays. However, massive defects are prone to be reproduced during the quantum dot (QD) film assembly, which would sorely affect carrier injection, transportation and recombination, and finally degrade QLED performances. Here, we propose a bilateral passivation strategy through passivating both top and bottom interfaces of QD film with organic molecules, which has drastically enhanced the efficiency and stability of perovskite QLEDs. Various molecules were applied, and comparison experiments were conducted to verify the necessity of passivation on both interfaces. Eventually, the passivated device achieves a maximum external quantum efficiency (EQE) of 18.7% and current efficiency of 75 cd A −1 . Moreover, the operational lifetime of QLEDs is enhanced by 20-fold, reaching 15.8 h. These findings highlight the importance of interface passivation for efficient and stable QD-based optoelectronic devices.
研究领域:
材料科学
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光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Wenwen Liu,Teng Zhang,Baohua Zhao,Chengben Liu,Youru Bai,Zhi Li,Shihui Zhu,Tailin Wang,Xinyu Sun,Heyuan Liu,Zhaobin Liu,Yanli Chen,Xiyou Li
The nonradiative carrier recombination at the perovskite/carrier selective layer (CSL) interface was accounted for the inferior power conversion efficiency (PCE) of perovskite solar cells (PSCs), especially rigid all-inorganic perovskite (CsPbI3 and CsPbBr3). In this study, targeting the poor interface, we introduce SbX3 (X = Cl, Br, I) surface passivation at the CsPbBr3/carbon interface. Smoothed compressive strain, reduced defect density, and enhanced energy-level alignment were achieved simultaneously, facilitating carrier extraction at the selective interface. With the simple aqueous solution-based two-step process, the PCE of our SbI3 passivated carbon-based CsPbBr3 PSCs has increased from 7.81% (without passivation) to 9.69%, a ∼25% enhancement. Specifically, Voc (1.657 V) of the SbI3-passivated cells was much higher than that of the control ones (1.488 V), confirming the ameliorated interface. Finally, our unencapsulated SbI3 passivated devices maintain 90% of their initial PCEs while left in the air for 30 days with a relative humidity of 60%. To conclude, we present an interfacial carrier extraction-enhanced strategy for preparing high-performance and stable CsPbBr3-based PSCs.
研究领域:
材料科学
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光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Discover Nano
·
2023
·Vol. 18
·期 1
·1-12
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IF 0
Zhou Houpu,Chen Mengwei,Liu Chenguang,Zhang Rui,Li Jing,Liao Sainan,Lu Haifei,Yang Yingping
Photodetectors (PDs) suffer from dark current due to defects in the perovskite photosensitive layer. Contact between the photosensitive layer and carbon electrodes could result in recombination of carriers at the interface. In this work, CsPbI 3 quantum dots (QDs) were added between the photosensitive layer and the carbon electrode as the interfacial layer to passivate the surface defects of perovskite layer and improve the energy level matching at the interface. The effect of QDs concentrations on the passivation of the perovskite layer was investigated. It was found that the photoluminescence intensity of perovskite films was the strongest and the decay lifetime was the longest when the QDs concentration was 3 mg/mL. Owing to QDs passivation, the dark current of perovskite PD decreased by 94% from \(2.04\; \times \;10^{ - 9}\) to \(1.17\; \times \;10^{ - 10}\) A. The responsivity ( R ) at 605 nm improved by 27% from 0.29 to 0.37 A/W at 0 V bias voltage. The specific detectivity ( D* ) increased by 420% from \(8.9\; \times \;10^{11}\) to \(4.7\; \times \;10^{12}\) Jones.
研究领域:
材料科学
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光电子学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Xin Zuo,Bohyung Kim,Baibai Liu,Dongmei He,Le Bai,Wenqi Wang,Cunyun Xu,Qunliang Song,Chunyang Jia,Zhigang Zang,Donghwa Lee,Xiong Li,Jiangzhao Chen
The interfacial carrier nonradiative recombination resulting from defects and energy barrier at buried interface hinders further enhancement of power conversion efficiency (PCE) and stability of perovskite solar cells. Herein, we report a simple and effective buried interface passivation strategy based on cation engineering through employing a new type of sulfonium salt ((2-carboxyethyl) dimethyl sulfonium chloride, CDSC) together with reference molecule (3-dimethylamino propionic acid hydrochloride, DPAH) to modify the interface between perovskite and electron transport layers. It is theoretically and experimentally revealed at the atomic scale that CDSC and DPAH chemically interact with both SnO 2 and perovskite layer and accordingly well bridge both layers. Both modifiers can not only passivate the defects from the surface of perovskite and SnO 2 films, but also reduce interfacial energy barrier via improving energy band alignment. CDSC are certified to be more effective in defect passivation and energy band modulation than DPAH, for the first time revealing that sulfonium cations are superior to commonly adopted ammonium cations. Finally, the DPAH and CDSC-modified devices achieve a PCE of 21.44% and 22.22%, respectively, far outperforming the control device (20.72%). The unsealed devices with CDSC maintain 92.5% of their initial efficiency after thermal aging for 1272 h.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Wenheng Li,Ziqi Zhao,Jianxin Guo,Bingbing Chen,Xiao Wang,Yuhua Bai,Jingwei Chen,Dehua Yang,Qing Gao,Xueliang Yang,Jianming Wang,Dengyuan Song,Shufang Wang,Xuning Zhang,Jianhui Chen
Passivation technology is crucial for reducing interface defects and impacting the performance of crystalline silicon (c-Si) solar cells. Concurrently, maintaining a thin passivation layer is essential for ensuring efficient carrier transport. With an ultrathin passivated contact structure, both Silicon Heterojunction (SHJ) cells and Tunnel Oxide Passivated Contact (TOPCon) solar cells achieve an efficiency surpassing 26%. To reduce production costs and simplify solar cell manufacturing processes, the rapid development of organic material passivation technology has emerged. However, its widespread industrial production is hindered by environmental safety concerns, such as strong acid corrosion and biological and ecological safety issues. Here, we discovered a low-cost self-assembled monolayer (SAM) hole-selective transport material known as 2PACz ([2-(9H-carbazol-9-yl) ethyl] phosphonic acid) with phosphate groups to form c-Si solar cells for the first time. The ultrathin film of 2PACz with phosphate groups can establish strong and stable P–O–Si bonds on the silicon surface. Meanwhile, like 2PACz, a uniform ultrathin film with a carbazole function group can offer electron-localizing and thus hole-selective properties, which provides ideas for studying dopant-free silicon solar cells. As a result of such interfacial passivation engineering, it plays an important role in repairing porous structures, such as pyramid-textured silicon surfaces, and cutting losses during the commercialization of c-Si solar cells. Crucially, this advancement offers insights for the development of new high-efficiency ultrathin film passivation methods in the postsilicon era.
研究领域:
材料科学
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能源技术
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光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2021
·Vol. 41
·期 1
·96-105
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IF 4.003
Zhao Jin-Jin,Su Xiao,Mi Zhou,Zhang Ying,Hu Yan-Jun,Guo Hua-Jun,Jiao Yi-Nan,Zhang Yu-Xia,Shi Yan,Hao Wei-Zhong,Wu Jing-Wei,Wang Yi,Gao Cun-Fa,Cao Guo-Zhong
Organic–inorganic hybrid perovskite solar cells, one of the most promising photovoltaic devices, have made great progress in their efficiency and preparation technology. In this study, uniform, highly conductive Li n NiO x (0 ≤ n ≤ 1; 0< x ≤ 3) films were prepared by electrochemical deposition for a range of Li concentration. Photovoltaic performance for the perovskite solar cells was enhanced through incorporation of the ion pair of Ni 3+ ↔ Ni 2+ as the interfacial passivation. Depending on the amount of lithium doping, controlled interfacial oxidation was induced by Ni 3+ . The Li 0.32 NiO x inhibited charge recombination, reduced the defect density, and enhanced the photocurrent density. A maximum power conversion efficiency of 20.44% was obtained by Li 0.32 NiO x . Further, in the long-term, in-air stabilities of unencapsulated Li n NiO x perovskite solar cells were demonstrated. Graphic abstract
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
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2024
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IF 3.7
Xiao Wang,Jinghua Zhou,Cui Zhang,Chaofan Zheng,Qing Zhang,Bei Liu,Zelin Jia,Tao Xue,Kunping Guo,Jin Huang,Fanghui Zhang
Fully inorganic metal halide perovskite solar cells (PSCs) exhibit high efficiency and excellent thermal stability. However, the presence of surface traps caused by oxygen vacancies in the electron transport layer leads to significant non-radiative charge recombination, which limits both the short-circuit current density ( J SC ) and photoelectric conversion efficiency (PCE). In this study, we propose a dual-purpose strategy by incorporating the multifunctional organic salt dopamine hydrochloride (DACl) as an additive into the electron transport layer. Firstly, DACl acts as a Lewis base when added to TiO 2 films, facilitating improvements in electron transport properties and resulting in higher photovoltaic quality of subsequently deposited perovskite layers. This enhancement significantly improves overall photovoltaic performance . Secondly, DACl's electron-rich aromatic structure and -NH 2 functional group can anchor undercoordinated Pb 2+ ions and passivate defects within the perovskite film. Additionally, its -OH functional group and charged ion Cl - play crucial roles in improving perovskite grain size and crystallinity . As a result of these modifications, cell efficiency increased ∼35 %, from 9.37 % to 12.70 %, while short-circuit current density increased from 15.44 mA cm −2 to 17.80 mA cm −2 at an illumination intensity of 100 mW cm −2 . These findings suggest that introducing DACl into the ETL layer is a promising approach for achieving efficient and stable PSCs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Yi Chen,Zhu Ma,Tangjie Yu,Zhuowei Du,Wei You,Junbo Yang,Shanyue Hou,Yanlin Li,Qianyu Liu,Wenwen Li,Qian Zhang,Hao Du,Yixian Li,Fuchun Gou,Qiang Yang,Guoming Li,Yuelong Huang,Kuan Sun,Yaohua Mai,Wei Long
Interface defect is one of the main factors that lead to non-radiative recombination of carriers at the interface and the decomposition of perovskites . This ultimately results in low efficiency and poor stability of perovskite solar cells (PSCs). Here, a passivated molecule called 2-Aminopyridine (2-APy) was proposed to reduce the defects of the interface between the perovskite and the hole transport layer. The results showed that the amino group in 2-aminopyridine can interact with the vacancy and free iodide ions on the surface of perovskite, thus passivating the defects at the interface and enhancing the hole transport capacity. As a result, 2-APy-modified PSCs exhibited inhibited non-radiative recombination, and the efficiency of PSCs increased to 21.46 %. The increase in the efficiency of PSCs is primarily seen in the rise of the open circuit voltage (V OC , from 1.12 to 1.15 V) and short circuit current (J SC , from 22.86 to 23.77 mA/cm 2 ). This work demonstrates that pyridine is an effective group for passivating the defects between the perovskite layer and the hole transport layer.
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
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2025
·Vol. 17
·期 1
·1-15
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IF 36.3
Zhang Xian,Liu Fangzhou,Guan Yan,Zou Yu,Wu Cuncun,Shi Dongchang,Zhang Hongkai,Yu Wenjin,Zou Dechun,Zhang Yangyang,Xiao Lixin,Zheng Shijian
Li 2 CO 3 is used to modify conformal SnO 2 as electron transport layer for hole transport layer-free carbon-based perovskite solar cells (C-PSCs).
CO 3 2− can induce MA release from the perovskite layer, resulting in PbI 2 at the grain boundary of top interface of perovskite film which can passivate the grain boundary and the top surface defects.
The Li 2 CO 3 -modified C-PSC exhibits a high power conversion efficiency (PCE) of 19.1%, with a V oc of 1.142 V. A record-high PCE of 33.2% is obtained under weak light-emitting diode illumination (2000 lx, 3000 K).
研究领域:
材料科学
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光伏技术
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能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ORGANIC ELECTRONICS
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2018
·
IF 3.68
Zhanfeng Li,Jinbo Chen,Jingkun Ren,Qinjun Sun,Hua Wang,Junsheng Yu,Yuying Hao
Organometal halide perovskite solar cells (PSCs) have demonstrated exceptional, unparalleled progress in solar cell performance by optimizing the perovskite film morphology, composition , interfaces, and charge collection efficiency. In this work, a PbBr 2 pre-coating layer (PCL) was employed to effectively fabricate a relatively uniform composition perovskite film with large crystal sizes and no voids. We demonstrated that carrier recombination is reduced and charge collection is improved by the interface and interior passivation in PSCs fabricated with PCL process, which leads to a striking enhancement in open-circuit voltage and short circuit current. As a result, a promising power conversion efficiency of 17.38%, showing more than 10% enhancement over the reference devices, was realized in the passivated invert planar PSCs with negligible hysteresis and stable photocurrent output. This study gives a novel compositional passivation process to produce high-efficiency halide PSCs with improved process reproducibility.
研究领域:
材料科学
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光伏技术
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 23
·15207-15214
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IF 4.123
Shujun Li,Zhiqi Li,Chunyu Liu,Xinyuan Zhang,Zhihui Zhang,Wenbin Guo,Liang Shen,Shengping Ruan,Liu Zhang
In this contribution, a series of conducting polyfluorenes (PF) are introduced to improve interface adhesion and boost charge extraction of the TiO2 electron transport layer of inverted polymer solar cells (PSCs). After employing poly (9,9-dihexylfluorenyl-2,7-diyl) (PDF), poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(1,4-benzo-{2,1′,3}-thiadiazole)] (PDFBT), and poly[(4-(5-(7-methyl-9,9-dioctyl-9H-fluoren-2-yl) thiophen-2-yl)-7-(5-methylthiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PFTBT) as capping layers, interfacial coherence improvement and energy loss decrease are both achieved, facilitating charge transfer from the active layer to the TiO2 layer. The optimized contact, enhanced electrical conductivity, and reduced internal resistance contribute to increased short-circuit current density and fill factor, leading to an enhanced power conversion efficiency (PCE) from 5.72% up to 7.97%. The employment of the PF capping TiO2 buffer layer provides a promising approach to develop high efficiency PSCs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Semiconductors
·
2021
·Vol. 42
·期 11
·112201
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IF 0
Xiao Zhang,Sai Ma,Jingbi You,Yang Bai,Qi Chen
Interfacial engineering has made an outstanding contribution to the development of high-efficiency perovskite solar cells (PSCs). Here, we introduce an effective interface passivation strategy via methoxysilane molecules with different terminal groups. The power conversion efficiency (PCE) has increased from 20.97% to 21.97% after introducing a 3-isocyanatopropyltrimethoxy silane (IPTMS) molecule with carbonyl group, while a trimethoxy[3-(phenylamino)propyl] silane (PAPMS) molecule containing aniline group deteriorates the photovoltaic performance as a consequence of decreased open circuit voltage. The improved performance after IPTMS treatment is ascribed to the suppression of non-radiative recombination and enhancement of carrier transportation. In addition, the devices with carbonyl group modification exhibit outstanding thermal stability, which maintain 90% of its initial PCE after 1500 h exposure. This work provides a guideline for the design of passivation molecules aiming to deliver the efficiency and thermal stability simultaneously.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
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