APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Junhan Zhang,Chenyue Wang,Chenyang Shen,Muyang Chen,Bingchen He,Zhenhuang Su,Liang Cao,Xingyu Gao
Understanding the interfacial energetics between metal halide perovskites and organic charge transport layers is critical for optimizing charge transport and achieving high-performance optoelectronic devices. While significant progress has been made in improving device efficiency, the fundamental interfacial electronic structure, particularly the influence of fabrication methods on energy level alignments, remains insufficiently explored. In this study, we compare CsPbI 2 Br films fabricated via spin coating and vacuum co-evaporation, using rubrene as a model hole-transporting layer. Ultraviolet photoelectron spectroscopy (UPS) and X-ray photoelectron spectroscopy (XPS) reveal that spin-coated CsPbI 2 Br films contain surface iodine vacancies and dangling bonds, which facilitate chemical interactions with rubrene. This results in the emergence of a new state below the valence band maximum and a relatively large hole injection barrier of ∼ 0.6 eV. In contrast, vacuum-evaporated CsPbI 2 Br films exhibit smoother, defect-less surfaces that interact physically with rubrene. The resulting interfacial electron transfer induces a band bending like effect, along with a reduced hole injection barrier of ∼ 0.4 eV, favoring more efficient hole collection. These findings highlight the critical role of fabrication techniques in modulating interfacial energetics and charge injection barriers through structural and electronic modifications, offering essential insights into interface engineering strategies for optimizing the performance of perovskite-based optoelectronic devices.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
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2023
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IF 29.4
Ruofei Xing,Ziqing Li,Wenxiao Zhao,Dong Wang,Ranran Xie,Yanxue Chen,Limin Wu,Xiaosheng Fang
Metal halide perovskite films have gained significant attention because of their remarkable optoelectronic performances. However, their poor stability upon the severe environment appears to be one of the main facets that impedes their further commercial applications. Herein, a method to improve the stability of flexible photodetectors under water and humidity environment without encapsulation is reported. The devices are fabricated using the physical vapor deposition method (Pulse Laser Deposition & Thermal Evaporation) under high-vacuum conditions. An amorphous organic Rubrene film with low molecular polarity and high elastic modulus serves as both a protective layer and hole transport layer. After immersed in water for 6000 min, the photoluminescence intensity attenuation of films only decreased by a maximum of 10%. The demonstrator device, based on Rubrene/CsPbBr 3 /ZnO heterojunction confirms that the strategy not only enhances device moisture and mechanical stability but also achieves high sensitivity in optoelectronic detection. In self-powered mode, it has a fast response time of 79.4 µs /207.6 µs and a responsivity 124 mA W −1 . Additionally, the absence of encapsulation simplifies the fabrication of complex electrodes, making it suitable for various applications. This study highlights the potential use of amorphous organic films in improving the stability of perovskite-based flexible devices.
研究领域:
材料科学
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光电技术
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 4
·1289-1301
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IF 7.393
Sartaj Wali,Qin Yin,Jiao Li,Guoxiang Si,Muhammad Shafi,Junfeng Ren,Hongbin Zhang
Organic–inorganic heterostructures (OIHs) are an emerging topic that has attracted great research enthusiasm due to their unique features for electronic and optoelectronic applications. Although OIHs constructed with topological insulators and organic small molecule semiconductors may have better device performance, this type of heterostructure has rarely been reported, and more research is required to uncover its internal dynamics. Thereby, OIHs based on organic rubrene and inorganic topological insulator Bi2Se3, which were prepared by employing simple physical vapor deposition, were investigated for the first time. Experimental results proved that the crystalline rubrene and topological insulator Bi2Se3 films are promising candidates for fabricating high-performance organic–inorganic heterostructure photodetectors (OIHPDs) accompanied by a broadband photodetection range. The Dirac surface state at the heterojunction interface facilitates the dissociation and transportation of photo-generated carriers. Importantly, the OIHPDs displayed excellent diode characteristics with a current rectifying ratio of 460, a maximum responsivity of 8.85 A W−1, a high detectivity of 3.14 × 1012 Jones, and an ultrafast response speed with τrise (2.1 μs) and τdecay (2.9 μs) under near-infrared light illumination of 1064 nm, respectively. Due to these interesting results, the OIHPDs can be used in many detection fields, and suggest a promising opportunity for novel device application in the future.
研究领域:
材料科学
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光电子学
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半导体物理
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产品关联
DOI
高影响因子
Surfaces and Interfaces
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2023
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IF 6.2
Ke Pei
Ferroelectric organic field-effect transistor (Fe-OFET) memory devices exhibit low power consumption, low cost and good flexibility, which are indispensable to next generation flexible and wearable memory devices. However, up until the present, the ferroelectric materials used in Fe-OFETs have been limited to ferroelectric polymers, i.e. poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)], and suffer from large surface roughness and high-risk of depolarization. This work integrates a new two-dimensional CuInP 2 S 6 crystal into Fe-OFET, which can introduce excellent ferroelectric property due to its single crystalline smoothness and noncentrosymmetric crystal structure. Meanwhile, the high-mobility rubrene crystal is selected as the channel material to construct rubrene/CuInP 2 S 6 organic/inorganic van der Waals heterojunctions . Associated with synergetic effect of single-crystalline nature of the heterojunction and atomically flat/defect-free interface, the memory devices possess a high programming speed of 0.5 s and long retention time of 10 4 s with a current ratio larger than 10 3 . Furthermore, the performance of flexible devices is also demonstrated, including a programming/erase cycle of 1000 with a current on/off ratio approaching 10 3 , data retention time of 10 4 s with a current on/off ratio of 10 3 and a current on/off ratio maintained at 10 2 even after 100 bending cycles under a bending radius of 25 mm, which are qualified for memory buffer usage or short-term data storage especially when they are integrated with other flexible electronics. The proposed configuration of memory transistors using organic/inorganic heterojunctions provides a rational design of device structure toward flexible Fe-OFET non-volatile memory applications.
研究领域:
材料科学
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凝聚态物理
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微电子学
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纳米科技
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柔性电子学
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半导体器件
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功能材料
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DOI
高影响因子
Small
·
2020
·Vol. 16
·期 32
·2002312
·
IF 11.459
Ke Pei,Fakun Wang,Wei Han,Sanjun Yang,Kailang Liu,Kewei Liu,Huiqiao Li,Tianyou Zhai
Organic single-crystalline semiconductors show great potential in high-performance photodetectors. However, they suffer from persistent photoconductivity (PPC) due to the charge trapping, which has severely hindered high-speed imaging applications. Here, a universal strategy of solving the PPC by integrating with topological insulator Bi 2 Se 3 is provided. The rubrene/Bi 2 Se 3 heterojunctions are selected as an example for general demonstration due to the reproducibly high mobility and broad optoelectronic applications of rubrene crystals. By virtue of high carrier concentration on Bi 2 Se 3 surface and the strong built-in electrical field, the photoresponse of the heterotransistor is significantly reduced for more than two orders (from over 10 s to 54 ms), meanwhile the photoresponsivity can reach 124 A W −1 . To the best of knowledge, this operating speed is among the fastest responses in organic–inorganic heterojunctions. The heterotransistor also shows unique negative differential resistance under positive gate bias, which can be explained by photoinduced de-trapping of electron trap states in the bulk rubrene crystals. Besides, the rubrene/Bi 2 Se 3 heterojunction behaves as a gate-tunable backward-like diode due to the inhomogenous carrier distribution in the thick rubrene crystal and inversion of relative Fermi level positions. The findings demonstrate versatile functionalities of the rubrene/Bi 2 Se 3 heterojunctions for various emerging optoelectronic applications.
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DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
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2013
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IF 4.425
Yan Li,Linru Xu,Yayun He,Bin Su
We report how electrochemiluminescence (ECL) of rubrene can be utilized for enhancing the visualization of latent fingerprints in two different modes. The enhancement arises from the spatially selective ECL generation either from the substrate surface uncovered by the fingerprint or the fingerprint itself, designated negative or positive imaging mode, respectively. The negative mode is performed directly in an electrolyte solution containing rubrene and co-reactant. Given that organic residues in the fingerprint deposit make the underlying surface electrochemically inert or less active, ECL reaction occurs only on the surface untouched by the fingertip, generating a negative impression with a dark ridge pattern against the illuminated background. The positive imaging mode is based on the preferential adsorption of rubrene aggregates to the ridge materials via physical attraction; then the fingerprint can glow via ECL reaction in a solution containing co-reactant under an appropriate applied potential.
研究领域:
分析化学
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法医学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Jingling Wu,Peiyao Ran,Shu Zhu,Fangjing Mo,Cun Wang,Yingzi Fu
We present a highly sensitive platinum nanoparticles (PtNPs), rhombus-shaped rubrene microsheets (RubRMs) and dissolved oxygen (O 2 ) system for the monitoring of l -cysteine by the quenched electrochemiluminescence (ECL) signals. Firstly, RubRMs has been prepared through reprecipitation method, then the metal organic composites of PtNPs-RubRMs was synthesized by a simple in situ reduction of PtNPs on RubRMs surface. The composites combined the high ECL characteristic of RubRMs, the wonderful catalytic efficiency and good electron transfer ability of PtNPs. With the synergistic effect between RubRMs and PtNPs, the proposed ECL sensors exhibited excellent responses for l -cysteine. Under the optimum conditions, the linear range was from 1.0 × 10 −9 mol L -1 to 5.0 × 10 -4 mol L -1 with a detection limit of 3.3 × 10 -10 mol L -1 (S/N = 3). And the results shows high sensitivity, excellent stability, and low background signal. It is simple to prepare and operate for the practical application.
研究领域:
分析化学
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生物医学工程
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产品关联
DOI
高影响因子
Small Science
·
2024
·
IF 11.1
Yi Zhang,Zida Zheng,Zhixing Gan,Rui Huang,Xiaowei Zhang
Luminescent solar concentrators (LSCs) are highly valued in transparent photovoltaics for their versatility and adaptability as effective large-area sunlight collectors. However, constructing LSCs as efficient, long-term stable, and easily malleable power-generating units still remains a challenge. Herein, high photostability, high photoluminescence quantum yield ( Φ PL ), and Stokes-shifted emission are achieved in tetra(t-butyl)rubrene/off-stoichiometry thiol-ene (TBRb/OSTE) hybrids by incorporating TBRb molecules into OSTE polymers. To demonstrate their potentials in LSCs, a luminescent solar concentrator integrated photovoltaics (LSCIPV) is created using a one-step synthesis that combines the preparation of TBRb/OSTE hybrids, coupling with the silicon solar cell, and the encapsulation of both components. The LSCIPV demonstrates remarkable flexibility and the integration of an ethylene tetrafluoroethylene film contributes to a hydrophobic surface and antireflection effect, resulting in an external photon efficiency ( η ext ) of 4.9% and a power conversion efficiency of 1.04% for the 100 cm 2 device. The LSCIPV exhibits good photostability over 800 h of UV light exposure. Monte Carlo ray-tracing simulations indicate that an optimized TBRb-based LSCIPV can potentially achieve an η ext of 1.3%, even for a large device with an area of 1 m 2 .
研究领域:
材料科学
·
能源技术
·
光学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）