Advanced Optical Materials
·
2023
·Vol. 11
·期 16
·2300302
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IF 9
Shanshan Yu,Yu Li,Jian Wang,Kai Zhang,Zedong Lin,Wei Qian,Ziqi Deng,Fumin Guo,Mingde Li,Lionel Vayssieres,Makhsud I. Saidaminov,David Lee Phillips,Shihe Yang
Halide perovskite narrowband photodetectors based on a charge collection narrowing mechanism have emerged as a new class of optoelectronic devices for monochromatic imaging. However, improving the figures-of-merit of such narrowband photodetectors remains challenging due to the inability to manipulate the major material players in the elusive photoresponse process. Here, a novel approach of manipulating ion migration to enhance the narrowband photoresponse of self-driven p-i-n type photodetectors is taken by intentionally adding mobile ions into the formamidine and methylamine mixed cation perovskite layer. The excess mobile ions reduce the activation energy of ion migration, and this facilitated migration orchestrates the ions in the perovskite layer to re-engineer the energy band, and thus modulates the charge separation and collection energetics and kinetics, leading to an unprecedented boost of the narrowband photoresponse. The photodetector based on this approach achieved a peak responsivity of as high as 112.41 mA W −1 at 820 nm at zero bias with a full-width at half maximum of only 22 nm and an over 3-fold improvement in the spectral rejection ratio, making it highly promising for the next-generation color imaging devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Xiao-Ning Hu,Lin Xiong,Li-Ming Wu
The A2MIIMIV3Q8 family (A = alkali metal; MII = divalent metal; MIV = tetravalent metal; Q = chalcogenide) has attracted much attention because of its diverse structures and properties. Herein, we have successfully synthesized six new compounds as the first Mn-containing members of this family, Cs2MnGe3S8 (1), Cs2MnGe3Se8 (2), Cs2MnSn3Se8 (3), Rb2MnGe3S8 (4), Rb2MnGe3Se8 (5), and Rb2MnSn3Se8 (6). Compounds 1 and 6 crystallize in the monoclinic space group P21/n (No. 14) and P21 (No. 4), respectively, whereas compounds 2–5 crystallize in the non-centrosymmetric orthorhombic P212121 (No. 19). According to our theoretical calculations, their energy gaps are mainly dominated by s states of MIV and p states of Q and minor Mn 3d. Plate-like crystals with sizes about 20 × 5 × 1 mm3 of 2 and 3 are obtained by the Bridgeman method. In addition, we propose a structure mismatch factor that is defined as F = rMII+ rMIV + 2rQ2– – 2rA+ to provide a clear description of how three different structure types distribute among the A2MIIMIV3Q8 family; when 1.2 < F < 1.9, members will adopt a P212121-type structure; when F is too small (<1.2) or too large (>1.9), P21/n or P21-type, respectively, will be taken.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Yuanfang Shen,Liangchen Chen,Luping Zhang,Weihang Han,Min Jiang,Hui Zheng
Photocatalytic fixation of nitrogen from air at normal temperature and pressure (NTP) is a fascinating topic for sustainable development and environment. A new type of organic ligand doped cobalt-iron oxides photocatalyst was designed and prepared which can inhibit the recombination of photoelectron-hole pairs and adjust the energy gap for converting nitrogen into ammonium at NTP. Its relevant properties and characterization data was examined by XRD, SEM, HRTEM, XPS, ESR, and UV-vis. These experimental data proved its nitrogen fixation ability. The rate of nitrogen fixation could be 216 μmol•L −1 •h −1 with simulated sunlight illumination. Moreover, this nitrogen fixation activity can also happen at night with the rate of 112μmol•L −1 •h −1 . This all-day nitrogen fixation ability makes it has the industrial potential application in future.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhifeng Li,Haowen Yan,Zhaoyi Yin,Guofeng Zhang,Yichao Wang,Sicheng Gao,Jie Pan,Zhiguo Song,Jianbei Qiu,Yongjin Li
The efficient utilization of near-infrared (NIR) light is an important challenge to extend the spectral response range of photocatalysts. Here, the NIR photocatalytic performance of Bi 3 O 4 Br nanosheets was significantly enhanced by a rare earth ion doping strategy that synergistically utilizes the dual mechanism of photon conversion and energy band modulation. Under 980 nm excitation, the Bi 3 O 4 Br:Er 3 + nanosheets exhibit near-single-band green upconversion (UC) emission and are reabsorbed by Bi 3 O 4 Br. Combined with DFT density of states calculations, it is shown that the band gap of the material has been lowered and the carrier transport paths have been optimized by the energy-band structural tuning. In the NIR photocatalytic degradation experiment of bisphenol A, Bi 3 O 4 Br was not degraded, and Bi 3 O 4 Br:Er 3+ showed better performance, which was 2.27 times higher than that of Bi 3 O 4 Br:Yb 3+ , Er 3+ . ESR testing and capture experiments indicate that under NIR light irradiation, •OH and e − are the primary active species in the photocatalytic reaction process. This work provides new design ideas for the development of efficient NIR photocatalytic materials.
研究领域:
材料科学
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催化化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 8
·期 1
·2001683
·
IF 4.948
Weiwei Wang,Zhenhuang Su,Bo Sun,Lei Tao,Hao Gu,Wei Hui,Qi Wei,Wei Shi,Xingyu Gao,Yingdong Xia,Yonghua Chen
Interfacial engineering is essential for facilitating carrier separation, charge extraction, and enhancing the stability in organic–inorganic perovskite solar cells (PSCs). Herein, a facile and effective method is demonstrated not only to tune the electronic performance of electron transporting layer (ETL) but also to passivate the defects at the interface between the ETL and perovskite. On the top of the tin(IV) oxide (SnO 2 ) ETL, butylammonium chloride (BACl) and lead(II) iodide (PbI 2 ) are introduced as interface to modify the ETL/perovskite interface. The PSCs with interface modified exhibit a power conversion efficiency (PCE) of 21.15%, compared to 18.33% for the device without interface modified. Such enhancement in efficiency is mainly attributed to a better energy band alignment, and the quality of perovskite films is improved through the interface modification, thus enhancing photogenerated charge extraction and leading to low charge carrier recombination at the interface of ETL/perovskite. Furthermore, the device with interface modified exhibits significant stability. This work provides an alternative strategy on the ETL/perovskite interface to obtain highly stable and efficient PSCs.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Jingjing Ning,Zihan Kang,Ni Qin,Mengshi Chen,Jiang Wu,Dinghua Bao
The discharge of toxic pollutants and the abuse of antibiotics present significant risks to both global food safety and public health. The utilization of clean mechanical energy for catalytic degradation has been demonstrated as a promising approach to overcome prevalent obstacles. In this work, we employ the approach of manipulating carrier separation through interface engineering to boost the piezocatalytic performance of BiFeO 3 (BFO). Specifically, a Z -scheme heterojunction is established with BFO by utilizing energy band-matching Bi 2 S 3 (BS). In contrast to the pure BFO (1.49 × 10 −2 min −1 ) and BS (1.64 × 10 −2 min −1 ), the BFO/BS heterojunction demonstrates a notable enhancement in piezocatalytic performance, reaching 3.56 × 10 −2 min −1 . This enhancement is believed to be due to the presence of a polarization field facilitating band tilt and the construction of Z -scheme heterojunction. Following the implementation of light assistance, the piezocatalytic efficiency of BFO/BS is enhanced to a greater extent (6.07 × 10 −2 min −1 ), attributing to the enhanced separation of photogenerated carriers facilitated by the piezoelectric polarization field. This study not only demonstrates the potential of BFO/BS as a catalytic candidate material by multimodal renewable energy harvesting, but also offers insights for the strategy of enhancing catalytic activity through interface engineering.
研究领域:
材料科学
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环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2021
·
IF 3.721
Qing Zhou,Wenbo Ma,Zhenlong Zhang,Yuefeng Liu,Huafang Zhang,Yanli Mao
In this paper, double-layered hole transport material (HTM) was designed and fabricated by adding a thin CuInS 2 film between perovskite and Spiro-OMeTAD (Spiro) layers. The power conversion efficiency (PCE) of the perovskite solar cells (PSCs) with double-layered HTM of CuInS 2 /Spiro was improved to 19.63% from 17.97% for the devices with pure Spiro. Moreover, the operational stability of the PSCs with double-layered HTM of CuInS 2 /Spiro was enhanced. The PCE of the PSCs with CuInS 2 /Spiro retains 91% of the initial value after 30 days storage in ambient atmosphere. The experimental results indicate that the improved performance could be come from the energy band match between CuInS 2 and Spiro, fast hole extraction and transport, and decreased charge recombination in the PSCs with double-layered HTM of CuInS 2 /Spiro. This work provides a promising prospect to design a low-cost and high stability HTM for commercial PSCs.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zuwang Liu,Bo Yu,Shengwei Shi,Huangzhong Yu
Self-assembled monolayers (SAMs) have been widely applied to perovskite solar cells (PSCs) due to their transparency, tunability, selectivity, and diversity. While numerous studies have focused on synthesizing various new types of SAMs to enhance charge transport, there remains a need for further research focused on reducing clusters of SAMs and improving the film coverage. Achieving uniform SAMs and ensuring intimate contact with the perovskite film are processes that require deeper investigation. In this study, we employ additive engineering to introduce a micromolecule, 4-mercaptophenylacetic acid (4MA), into [4-(3,6-diphenyl-9H-carbazol-9-yl) butyl] phosphonic acid (Ph-4PACz). The incorporation of 4MA can not only prevent the aggregation of Ph-4PACz through a competitive mechanism, leading to improved film coverage and uniformity, but also passivate the perovskite layer and reduce charge recombination in PSCs. As a result, more homogeneous and higher-quality perovskite films are achieved on both the surface and the bottom of the perovskite layer. Moreover, 4MA also optimizes the alignment of the energy band and enhances the carrier transfer. These combined effects contribute to a high power conversion efficiency of 23.8% in methylammonium-free PSCs. Our study demonstrates the potential of additive engineering in SAMs and presents a method for producing uniform SAMs, which is highly advantageous for industrial applications.
研究领域:
材料科学
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能源技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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