ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wei Li,Yalun Xu,Jiali Peng,Ruiming Li,Jiannan Song,Huihuang Huang,Lihao Cui,Qianqian Lin
X-ray detection is widely utilized in our daily life, such as in medical diagnosis, security checking, and environmental monitoring. However, most of the commercial X-ray detectors are based on inorganic semiconductors, e.g., Si, CdTe, and Ge, which require complex and costly fabrication processes. Metal halide perovskites have recently emerged as a set of promising candidates for ionizing radiation detection, owing to the high attenuation coefficient, long carrier lifetime, and excellent charge transport properties. Perovskite single crystals have been successfully implemented in X-ray detection, but the fragile single crystals limit the device fabrication and the integration with a read-out circuit. In addition, it is hard to reach inch-size single crystals for real application. Flexible devices based on perovskite films or composite films have also been reported, but either the thickness or charge transport properties are limited by the solution processes. In this work, we introduced thermal co-evaporation to deposit highly efficient formamidinium lead iodide perovskite films. Considering the trade-off between X-ray absorption and charge transport, we optimized the active layer thickness and achieved large-area and flexible X-ray detectors with state-of-the-art device performance, including extremely low dark current and noise, fast response, and high sensitivity of 142.1 μC Gyair–1 cm–2.
研究领域:
材料科学
·
医学影像
·
辐射探测
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yanyan Duan,Gen Zhao,Xiaotao Liu,Jiale Ma,Shuyao Chen,Yanlin Song,Xiaodong Pi,Xuegong Yu,Deren Yang,Yiqiang Zhang,Feng Guo
High power conversion efficiency (PCE) and good long-term stability are everlasting pursuit for perovskite solar cells. We present here CsPbBr 3 perovskite film deposited by vacuum co-evaporation of CsBr and PbBr 2 . By optimizing evaporation rate ratio of the two precursor and annealing temperature, perovskite films with large grain and high crystallinity are obtained. Furthermore, by regulating spinning speed of TiO 2 precursor solution and thickness of CsPbBr 3 film, a best PCE of 9.43% is recorded under 100 mW cm −2 illumination, providing a significant enhancement in contrast with 6.26% of device based on spin-coating method. Additionally, the PCE of resulting perovskite solar cell without encapsulation remains at 96% of initial value after storing for 480 h under humidity of 40% in air. Our findings in this work deliver an effective strategy to fabricate high-performance inorganic perovskite solar cells.
研究领域:
材料科学
·
太阳能技术
✓ 已验证
DOI
高影响因子
Solar RRL
·
2019
·Vol. 3
·期 12
·1900305
·
IF 0
Muhammad Ishaq,Hui Deng,Umar Farooq,Huan Zhang,Xiaokun Yang,Usman Ali Shah,Haisheng Song
Sb 2 S 3 being a light-absorbing material is used for photovoltaic (PV) application due to its superior stability and progressive power conversion efficiency (PCE) benefiting from its low cost, less toxic, earth-abundant, and facile nature. Due to the difficulty in efficient doping for such 1D structure, the performance of as-fabricated thin-film solar cells is limited by high resistivity and hole extraction barrier. Herein, a coevaporation scheme is introduced for copper-doped Sb 2 S 3 by rapid thermal evaporation (RTE). The Cu-doped Sb 2 S 3 thin film discloses the enhanced crystallinity with a grain diameter greater than 1 µm and conductivity along with improved carrier concentration. At the same time, the deep valance band obtains a minor upshift, favoring the hole extraction at back contact. Consequently, all the PV parameters are enhanced leading to the PCE boosting from 4.18% to 4.61%. Herein, a facile doping technique is demonstrated to improve its performance without any modification of the present RTE method.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
Solar RRL
·
2022
·Vol. 6
·期 7
·2200091
·
IF 9.173
Jiexuan Jiang,Andraž Mavrič,Nadiia Pastukhova,Matjaz Valant,Qiugui Zeng,Zeyu Fan,Beibei Zhang,Yanbo Li
Inorganic carrier-selective layers (CSLs), whose conductivity can be effectively tuned by doping, offer low-cost and stable alternatives for their organic counterparts in perovskite solar cells (PSCs). Herein, a dual-source electron-beam co-evaporation method for the controlled deposition of copper-doped nickel oxide (Cu:NiO) and tungsten-doped niobium oxide (W:Nb 2 O 5 ) as hole and electron transport layers, respectively, is used. The mechanisms for the improved conductivity using dopants are investigated. Owing to the improved conductivity and optimized band alignment of the doped CSLs, the all-inorganic-CSLs-based PSCs achieve a maximum power conversion efficiency (PCE) of 20.47%. Furthermore, a thin titanium buffer layer is inserted between W:Nb 2 O 5 and the silver electrode to prevent halide ingression and improve band alignment. This leads to a further improvement of PCE to 21.32% and long-term stability (1200 h) after encapsulation. Finally, the large-scale applicability of the doped CSLs by coevaporation is demonstrated for the device with 1 cm 2 area showing a PCE of over 19%. The results demonstrate the potential application of the coevaporated CSLs with controlled doping in PSCs for commercialization.
研究领域:
材料科学
·
光伏技术
·
能源转换
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 21
·13210-13216
·
IF 3.945
ChunWei Zhou,Yu Huang,YinLong Zhang,Bin Lu,YiFeng Xu,QuanLin Ye,XuXin Yang,JianQiang Zhong,Jian-Xin Tang,HongYing Mao
The booming growth of all inorganic cesium lead halide perovskites in optoelectronic applications has prompted extensive research interest in the fabrication of ordered nanostructures or microarrays for enhanced device performances. However, the high cost and complexity of commercial lithographic approaches impede the facile fabrication of perovskite microarrays. Herein, CsPbBr3 microarrays with tunable periodicities have been fabricated using a self-assembled polystyrene nanosphere template and a co-evaporation method. The periodicity of CsPbBr3 microarrays is precisely manipulated by simply modifying the size of polystyrene nanospheres. These microarrays are beneficial for light harvesting, leading to better light absorption ability and prolonged photoinduced carrier lifetime. The longest average carrier lifetime of 58.3 ns is obtained for CsPbBr3 microarrays with a periodicity of 1.0 μm. More importantly, the periodic structures of CsPbBr3 microarrays result in a tunable density of emitter tips in field emission devices. Compared to compact CsPbBr3 films, a 68.2% decrease of the turn-on field is observed for CsPbBr3 microarrays when the periodicity is 150 nm. The higher density of emitter tips leads to larger local field enhancement, and hence the largest field enhancement factor of 3346.6. Finally, a good emission current stability for CsPbBr3 microarray-based field emission devices has been demonstrated.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 18
·6736-6741
·
IF 5.101
Xiwei Zhang,Jiansheng Jie,Zhi Wang,Chunyan Wu,Li Wang,Qiang Peng,Yongqiang Yu,Peng Jiang,Chao Xie
Single-crystal p-type ZnSe nanowires (NWs) with zinc blende structure and [21–1] growth direction were synthesized by using bismuth (Bi) as dopant via a thermal co-evaporation method. The ZnSe : Bi NWs showed evident p-type conductivity with hole concentration up to 4.1 × 1018 cm−3 after the acceptor activation. Negative photoconductivity was first investigated in the p-ZnSe NWs, i.e., the conductivity of the NWs under light was dramatically lower than that in the dark. Surface effects arising from oxygen absorption and photo-desorption were suggested to be responsible for this. By using Al as the Schottky gate, high-performance nano-metal-semiconductor field-effect transistors (nanoMESFETs) were constructed, and measurements on the Al/p-ZnSe NW Schottky diode also revealed the bias-dependent photoresponse. It is expected that the p-type ZnSe : Bi NWs will have great potential in nano-optoelectronic applications.
研究领域:
材料科学
·
半导体物理
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纳米技术
·
光电子学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Minghong Rui,Xiaokang Lu,Yuan Li,Sanmin Liu,Xiuhong Jin,Sumei Wang
Antimony sulfide (Sb2S3) has emerged as a promising photoactive material due to its high light absorption capability. However, the organic Spiro-OMeTAD hole transport layer (HTL) poses a severe challenge to highly efficient Sb2S3 solar cells because of its high cost and poor stability. To address these issues, a MnS–PbS composite HTL was fabricated via the coevaporation process for the first time. By tuning the MnS:PbS ratio, the microstructure, carrier transport, and energy band alignment at the Sb2S3/ MnS–PbS interface were optimized. The high carrier mobility of PbS films and the high carrier concentration of MnS films enabled the MnS–PbS composite HTL possessing the superior conductivity. Devices employing the optimized MnS–PbS HTL achieved a champion power conversion efficiency of 6.60%, with significant improvements in short-circuit current, fill factor, and photostability due to the enhanced hole transport, suppressed recombination, and reduced photocurrent loss. This facile coevaporated composite HTL demonstrates a significant potential for efficient fully inorganic Sb2S3 solar cells.
研究领域:
光伏技术
·
材料科学
·
半导体器件
·
薄膜技术
✓ 已验证
DOI
高影响因子
Nature Photonics
·
2023
·Vol. 17
·期 5
·435-441
·
IF 35
Li Jinghui,Du Peipei,Guo Qingxun,Sun Liang,Shen Zixi,Zhu Jiaxing,Dong Chong,Wang Liang,Zhang Xin,Li Luying,Yang Chaoqun,Pan Jie,Liu Zhengzheng,Xia Bing,Xiao Zewen,Du Juan,Song Boxiang,Luo Jiajun,Tang Jiang
Perovskite light-emitting diodes (PeLEDs) have recently demonstrated great potential for next-generation displays. Fabricating PeLEDs by scalable and well-established thermal evaporation—the technique used for industrial manufacturing of organic light-emitting diodes—should accelerate the development of perovskite displays; however, thermal evaporation of perovskites produces films with a high density of defects due to fast and uncontrollable crystal growth during evaporation. As a result, the performance of evaporated PeLEDs is lagging behind their solution-processed counterparts. Here we develop a tri-source co-evaporation strategy to introduce a multifunctional Lewis-base additive that reduces the perovskite grain size while confining charge carriers and passivating surface defects. The process enables the in situ formation of high-quality perovskite nanocrystal films with improved crystallinity, enhanced photoluminescence quantum yield and suppressed defects. A peak external quantum efficiency of 16.4% is achieved for green PeLEDs with an all-thermally evaporated device architecture. We further fabricate active-matrix PeLED displays by integrating top-emitting PeLEDs on a 6.67-inch thin-film transistor backplane. The displays show high-definition images and videos with a resolution of 1,080 × 2,400 and continuous greyscale information. We anticipate that this work will stimulate the exploration of efficient vapour-deposited PeLEDs for industrial display applications.
研究领域:
材料科学
·
电气工程
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）