Small
·
2025
·
IF 12.1
Wei Wu,Wen He,Duoduo Ling,Lei Chen,Yinze Zhang,Xiangqian Fan,Yanghao Bi,Dongbo Wang,Jinzhong Wang
Self-powered broadband photodetectors (SPBDs) have received widespread attention due to their significant applications in optical communication, remote sensing, and imaging. Vertical heterojunctions are promising for SPBDs due to their efficient photogenerated carrier separation and high integration density. However, certain band alignments at the interface can drive carriers to recombine that undermines the former advantage. Here, a SPBD based on the Bi 2 Te 3 /Sb 2 O 3 /p-Si vertical heterojunction is developed that introduces the Sb 2 O 3 as a carrier blocking layer and achieves improved self-powered photoresponse than Bi 2 Te 3 /p-Si. A one-step electron beam evaporation approach is adopted to deposit a narrow-bandgap optical-active layer Bi 2 Te 3 and a blocking layer Sb 2 O 3 on p-type Si substrates. Such photodetector exhibits detection performance across a broad response band of UV–vis–NIR (254–1050 nm). Owing to the built-in electric field within the heterojunction, the blocking effect and the photovoltaic effect induced by the Sb 2 O 3 layer, the detector achieves high responsivity (316.5 mA·W −1 ), detectivity (6.19 × 10 11 Jones) and fast rise and decay times (24.6/25.1 ms). Furthermore, the device exhibits excellent imaging capabilities for UV, visible, and near-infrared light patterns. The work presents a SPBD using Bi 2 Te 3 -based vertical heterostructure and proposes a novel and instructive performance-enhancing approach using a metal oxide layer based on carrier blocking layer engineering.
研究领域:
材料科学
·
光电子学
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Pan Yuzhu,Wang Xin,Xu Yubing,Li Yuwei,Elemike Elias Emeka,Shuja Ahmed,Li Qing,Zhang Xiaobing,Chen Jing,Zhao Zhiwei,Lei Wei
Introducing hole/electron transporting and blocking layers is considered to enhance the performance of electronic devices based on organic–inorganic hybrid halide perovskite single crystals (PSCs). In many photodiodes, the hole/electron transporting or blocking materials are spin-coated or thermal-evaporated on PSC to fabricate heterojunctions. However, the heterojunction interfaces due to lattice mismatch between hole/electron, transporting or blocking materials and perovskites easily form traps and cracks, which cause noise and leakage current. Besides, these low-mobility transporting layers increase the difficulty of transporting carriers generated by photons to the electrode; hence, they also increase the response time for photo detection. In the present study, MAPbCl3-MAPbBr2.5Cl0.5 heterojunction interfaces were realized by liquid-phase epitaxy, in which MAPbBr2.5Cl0.5 PSC acts as an active layer and MAPbCl3 PSC acts as a hole blocking layer (HBL). Our PIN photodiodes with epitaxial MAPbCl3 PSC as HBL show better performance in dark current, light responsivity, stability, and response time than the photodiodes with spin-coated organic PCBM as HBL. These results suggest that the heterojunction interface formed between two bulk PSCs with different halide compositions by epitaxy growth is very useful for effectively blocking the injected charges under high external electric field, which could improve the collection of photo-generated carriers and hereby enhance the detection performance of the photodiode. Furthermore, the PIN photodiodes made of PSC with epitaxial HBL show the sensitivities of 7.08 mC Gyair−1 cm−2, 4.04 mC Gyair−1 cm−2, and 2.38 mC Gyair−1 cm−2 for 40-keV, 60-keV, and 80-keV X-ray, respectively.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
Solar RRL
·
2024
·Vol. 8
·期 11
·2400158
·
IF 6
Yandong Wang,Rongmei Zhao,Xin Yu,Liufei Li,Puan Lin,Shantao Zhang,Shuang Gao,Xinyu Li,Wenfeng Zhang,Wen-Hua Zhang,Shangfeng Yang
Inverted (p-i-n) perovskite solar cells (PSCs) are advantageous in terms of easy fabrication, low-temperature processibility, negligible hysteresis, and excellent compatibility with the tandem devices in comparison with the regular (n-i-p) counterparts. Hole-blocking layer is crucial for efficient electron transport of inverted PSCs, and only a single hole-blocking layer of bathocuproine (BCP) is used typically. Herein, bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO) with a deep highest occupied molecular orbital (HOMO) energy level is incorporated atop of perovskite film as an auxiliary hole-blocking layer, resulting in an enhanced electron transport of inverted PSC devices. The P=O group within DPEPO can coordinate with Pb 2+ cations of perovskite, leading to passivation of surface defects of perovskite. Besides, incorporation of DPEPO hole-blocking layer prohibits undesired hole transport from perovskite to PCBM electron transport layer (ETL), thus suppressing non-radiative electron–hole recombination. As a result, combined with BCP hole-blocking layer, inverted PSC devices based on double hole-blocking layers exhibit a decent power conversion efficiency (PCE) of 24.17% with a high open-circuit voltage ( V oc ) of 1.15 V which dramatically surpasses that based on single hole-blocking layer (22.26%). Moreover, incorporation of hydrophobic DPEPO helps to improve the ambient and thermal stabilities of inverted PSC devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Zhang Chang,Yu Jiameng,Cui Yuanyuan,Lv Yinjie,Zhang Yue,Gao Tianyi,He Yuxi,Chen Xin,Li Tao,Lin Tianquan,Mi Qixi,Yu Yi,Liu Wei
Garnet oxide is one of the most promising solid electrolytes for solid-state lithium metal batteries. However, the traditional interface modification layers cannot completely block electron migrating from the current collector to the interior of the solid-state electrolyte, which promotes the penetration of lithium dendrites. In this work, a highly electron-blocking interlayer composed of potassium fluoride (KF) is deposited on garnet oxide Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO). After reacting with melted lithium metal, KF in-situ transforms to KF/LiF interlayer, which can block the electron leakage and inhibit lithium dendrite growth. The Li symmetric cells using the interlayer show a long cycle life of ~3000 hours at 0.2 mA cm −2 and over 350 hours at 0.5 mA cm −2 respectively. Moreover, an ionic liquid of LiTFSI in C 4 mim-TFSI is screened to wet the LLZTO|LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) positive electrode interfaces. The Li|KF-LLZTO | NCM cells present a specific capacity of 109.3 mAh g −1 , long lifespan of 3500 cycles and capacity retention of 72.5% at 25 °C and 2 C (380 mA g −1 ) with an average coulombic efficiency of 99.99%. This work provides a simple and integrated strategy on high-performance quasi-solid-state lithium metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Yaoming Xiao,Gaoyi Han,Jihuai Wu,Jeng-Yu Lin
A novel bifacial perovskite solar cell (PSC) is devised and prepared by using a highly transparent poly(3,4-ethylenedioxythiophene) (PEDOT) electrode. The PEDOT is used as the p-type hole-transporting material (HTM) due to the well matched band positions for the charge separation and transport. Moreover, the PEDOT layer can play a role of electron blocking layer at the CH 3 NH 3 PbI 3 /PEDOT interface to reduce the electron recombination rate because of its LUMO level is higher than that of the perovskite sensitizer. As a result, the bifacial PSC based on the PEDOT HTM yields front and rear efficiencies of 12.33% and 11.78% respectively, which are higher than those of the PSC without the PEDOT HTM (8.67% and 8.27% of the front and rear efficiencies). And the front efficiency is only decreased by 4.46% to the rear efficiency. These promising results highlight the potential application of the PEDOT in the cost-effective and transparent PSC, which could be used in the bifacial solar cell and tandem solar cell .
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
Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-9
·
IF 5.418
Zhou Zhuoli,Liao Guangmeng,Song Xinyu,Dai Qinyong,Sun Lei,Peng Yingquan,Wang Peng
As an important classification of photodetectors, broad spectral photodiodes are ubiquitous in the fields of industry and scientific research. Here, we reported a type of broad spectral organic–inorganic hybrid photodiodes (OIHPDs) based on planar-bulk heterojunction, which composed of 3,4,9,10-perylenetertracarboxylic dianhydride (PTCDA), copper phthalocyanine (CuPc) and fullerene (C 60 ). In our research, the dark current of the OIHPD with 10 nm C 60 film (10 nm-C 60 OIHPD) was as low as 25.6 μA, which is about 63 times smaller than the dark current of the OIHPD without C 60 film (C 60 -free OIHPD). It is considered that the significantly enhanced performance of 10 nm-C 60 OIHPD is attributed to the introduction of the C 60 film, which act as hole-blocking layer to reduce the dark current. And through the schematic energy level model combined with experimental measurements, the reason for the dark current change was well explained. Furthermore, the specific detectivity of 10 nm-C 60 OIHPD was almost one order of magnitude larger than it of C 60 -free OIHPD, and a notable enhancement of over 10 11 cm Hz 1/2 /W was obtained due to the fiercely reduced dark current. These results provide insights on how to improve the performance of organic photodiodes.
研究领域:
材料科学
·
光电探测器研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Batteries & Supercaps
·
2020
·Vol. 3
·期 9
·892-899
·
IF 0
Wantang Li,Yifang Zhang,Huan Li,Zijin Chen,Tongxin Shang,Zhitan Wu,Chen Zhang,Jia Li,Wei Lv,Ying Tao,Quan-Hong Yang
The shuttle effect of lithium polysulfides (LiPSs) from sulfur cathode to lithium (Li) anode is one of the main obstacles for lithium-sulfur (Li−S) batteries. The severe corrosion of Li metal anode by the dissolved LiPSs bottlenecks the efficient operation of Li−S batteries, however, the anode part has not been received much attention compared to those extensive efforts related to the cathode designs. Herein, we show that the interface between Ti 3 C 2 T x (T=−OH, −F)-based MXene and reduced graphene oxide (rGO) is able to guide uniform Li nucleation, promoting highly reversible and dendrite-free Li plating/stripping. Such the Li anode demonstrates excellent cycling stability for more than 1000 hours even under ultra-high rate (10 mA cm −2 ) and high areal capacity (3 mAh cm −2 ). More importantly, the well-designed 2D layered structure by coupling the Ti 3 C 2 T x with a graphene scaffold, is highly efficient to block the shuttled polysulfides and inhibit the corrosion of the lithium metal anode. As a result, the Li−S full battery exhibits a stable cycling stability with a high Coulombic efficiency of 99.8 % over 300 cycles. This work suggests the design strategy of Li metal anode especially targeting at the sulfur cathode, and we hope it can provide valuable inspirations for the future design of Li metal anodes for more practical Li−S batteries. Graphical MXene shield : The rGO/Ti 3 C 2 T x interfaces favor Li nucleation and deposition, contributing to dendrite-free Li plating/stripping behaviors inside the scaffold. The membrane also mitigates the side reactions of Li by blocking the shuttled lithium polysulfides, which promotes the efficient cycling of Li−S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
Frontiers in Chemistry
·
2020
·
IF 3.693
Xu Yubing,Wang Xin,Pan Yuzhu,Li Yuwei,Emeka Elemike Elias,Li Qing,Zhang Xiaobing,Chen Jing,Zhao Zhiwei,Lei Wei
Organic-inorganic hybrid perovskite single crystals (PSCs) have been emerged as remarkable materials for some optoelectronic applications such as solid-state photodetectors, solar cells and light emitting diodes due to their excellent optoelectronic properties. To decrease the dark current, function layers based on spin-coating method are frequently requested for intrinsic PSCs to block the injected current by forming energy barrier. However, the amorphous function layers suffer from small carrier mobility and high traps density, which limit the speed of the photoelectric response of perovskite devices. This work supposes to grow thick MAPbBr3 and MAPbI3 mono-crystalline thin films on the surface of intrinsic MAPbBr2.5Cl0.5 PSCs substrate by a heteroepitaxial growth technique to act as electron-blocking layers. Meanwhile, C60 and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) layers are deposited on the opposite surface of substrate PSCs by spin-coating method to block injected holes. This Au-MAPbI3-MAPbBr3-MAPbBr2.5Cl0.5PSCs-C60-PCBM-Ag heterostructure can be used as excellent X-ray photodetector (XPD) due to its low dark current density of 6.97 × 10−11 A cm−2 at −0.5 V bias, high responsivity of 870 mA/W at −100 V bias and X-ray sensitivity as high as 59.7 μC mGy−1 cm−2 at −50 V bias.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 45
·2304285
·
IF 29.4
Yiqi Wei,Yaxiong Yang,Zichong Chen,Panyu Gao,Qihang Ma,Mingxi Gao,Chenhui Yan,Zhijun Wu,Yinzhu Jiang,Jian Chen,Xuebin Yu,Zhenglong Li,Xin Zhang,Yongfeng Liu,Mingxia Gao,Wenping Sun,Hongge Pan
LiBH 4 is a promising solid-state electrolyte (SE) due to its thermodynamic stability to Li. However, poor Li-ion conductivities at room temperature, low oxidative stabilities, and severe dendrite growth hamper its application. In this work, a partial dehydrogenation strategy is adopted to in situ generate an electronic blocking layer dispersed of LiH, addressing the above three issues simultaneously. The electrically insulated LiH reduces the electronic conductivity by two orders of magnitude, leading to a 32.0-times higher critical electrical bias for dendrite growth on the particle surfaces than that of the counterpart. Additionally, this layer not only promotes the Li-ion conductance by stimulating coordinated rotations of BH 4 − and B 12 H 12 2− , contributing to a Li-ion conductivity of 1.38 × 10 −3 S cm −1 at 25 °C, but also greatly enhances oxidation stability by localizing the electron density on BH 4 − , extending its voltage window to 6.0 V. Consequently, this electrolyte exhibits an unprecedented critical current density (CCD) of 15.12 mA cm −2 at 25 °C, long-term Li plating and stripping stability for 2700 h, and a wide temperature window for dendrite inhibition from −30 to 150 °C. Its Li-LiCoO 2 cell displays high reversibility within 3.0–5.0 V. It is believed that this work provides a clear direction for solid-state hydride electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yu You,Mengli Wei,Likun Yang,Jingwen Wang,Yongxing Zhang,Jun Xu
The practical applications of high-performance lithium-sulfur batteries are severely hindered by the insulating nature of sulfur and intractable shuttling of the polysulfide intermediates. In this work, we report a novel MoSe 2 @rGO cathode coating consisting of two-dimensional MoSe 2 and reduced graphene oxide (rGO) as a multifunctional barrier to suppress polysulfide shuttling. Few-layered MoSe 2 nanosheets are in situ grown on the rGO surface by basal plane contact. Besides, some cotton-like MoSe 2 nanospheres assembled from porous nanosheets are decorated on the surface of rGO nanosheets. Benefitted from the strong chemical adsorption of polar MoSe 2 and excellent electrical conductivity of rGO, the MoSe 2 @rGO coatings exhibit highly efficient polysulfide anchoring and significantly enhanced electrocatalytic chemistry. Moreover, the MoSe 2 @rGO cathode coatings are much superior to its separator coatings in the recycling of the adsorbed active materials because of good interfacial conductivities. The cell with the MoSe 2 @rGO cathode coating delivers a high reversible capacity up to 1216 mAh g −1 at 0.2 C and outstanding cycling stability with a low capacity fading rate of 0.03% at 1 C over 1000 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Irum Firdous,Muhammad Fahim,Walid A. Daoud
Enhancing negative charge retention sites on a contact surface is a key parameter to boost the performance of triboelectric nanogenerators . However, the unstable positive charge on the other contact surface can also be transferred as all surfaces have both charge donating and accepting regions. To prevent alternate charge transfer and charge recombination, PVDF is doped with phytate ion cluster as the tribopositive layer to trap positive charges through the formation of 18 hydrogen bonds or chelation through mono, di and trivalent cations of the 12 reactive phosphate groups , resulting in a 9.3-fold increase in current density. Moreover, the tribonegative layer is optimized with deeper trap states and more localization of negative charge (i.e . PDMS), which keeps tribocharges for longer duration of 5.5 h and results in a further 32-fold increase in current density to 4.4 mA m −2 . With the intrinsic charge trap enhancement, the device possesses high mechanical stability and durability, where the output performance remains intact after 16 month storage, due to the excellent compatibility of PVDF with phytate. Moreover, when four units of the device are stacked in parallel alternate layered form, an increase in output current from 1.1 µA to 20.9 µA with power density 0.80 W m −2 was obtained, displaying potential of the device design for powering high demand wearable electronics .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Nature Communications
·
2015
·Vol. 6
·期 1
·1-7
·
IF 11.47
Ke Weijun,Fang Guojia,Wan Jiawei,Tao Hong,Liu Qin,Xiong Liangbin,Qin Pingli,Wang Jing,Lei Hongwei,Yang Guang,Qin Minchao,Zhao Xingzhong,Yan Yanfa
Efficient lead halide perovskite solar cells use hole-blocking layers to help collection of photogenerated electrons and to achieve high open-circuit voltages. Here, we report the realization of efficient perovskite solar cells grown directly on fluorine-doped tin oxide-coated substrates without using any hole-blocking layers. With ultraviolet–ozone treatment of the substrates, a planar Au/hole-transporting material/CH 3 NH 3 PbI 3- x Cl x /substrate cell processed by a solution method has achieved a power conversion efficiency of over 14% and an open-circuit voltage of 1.06 V measured under reverse voltage scan. The open-circuit voltage is as high as that of our best reference cell with a TiO 2 hole-blocking layer. Besides ultraviolet–ozone treatment, we find that involving Cl in the synthesis is another key for realizing high open-circuit voltage perovskite solar cells without hole-blocking layers. Our results suggest that TiO 2 may not be the ultimate interfacial material for achieving high-performance perovskite solar cells.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）