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1.
Yiyi Pan Haoliang Wang Yaxin Wang Yanyan Wang Xiaoguo Li Yiting Liu Liangliang Deng Kai Liu Tianxiang Hu Fengcai Liu Zejiao Shi Chongyuan Li Jiao Wang Anran Yu Xiaolei Zhang Yiqiang Zhan 《Advanced Electronic Materials》2023,9(3):2201028
2D Ruddlesden–Popper perovskites have attracted increasing attention for their outstanding optoelectronic properties and improved stability compared to the 3D counterparts. The unique nature of the crystal growth orientations and the uneven distribution in the 2D perovskites provide a great opportunity to construct a promising lateral photodetector device that has not been fully uncovered. Here, by improving the random orientation to the vertical orientation of the film in the lateral device structure, the dark current is expected to be significantly suppressed in the photodetector. Accompanied by the gradient phase distribution, a p-type conductive channel at the bottom and another electron collection layer on the top are applied to achieve a high on/off ratio. Overall, the resultant photodetector realizes a low dark current of 10−10 A and exhibits impressive photodetection performance, including a high responsivity of 10.10 A W−1, a notable detectivity of 6.83 × 1012 Jones, and fast response speeds (14 ms/31 ms). 相似文献
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Rosanna Mastria Karl Jonas Riisnaes Agnes Bacon Ioannis Leontis Hoi Tung Lam Mohammed Ali Saleh Alshehri David Colridge Tsz Hin Edmund Chan Adolfo De Sanctis Luisa De Marco Laura Polimeno Annalisa Coriolano Anna Moliterni Vincent Olieric Cinzia Giannini Steven Hepplestone Monica Felicia Craciun Saverio Russo 《Advanced functional materials》2024,34(36):2401903
Layered (2D) perovskites are an emerging attractive 2D system with enhanced stability to ambient conditions as opposed to their highly unstable three dimensional bulk counterpart. Their uniquely tuneable optical and electrical properties are underpinning a surge of interest in 2D-photovoltaics. So far, the development of nano-scale integrated opto-electronic 2D perovskite devices remains nearly unexplored since they have generally been found to be incompatible with standard top-down semiconductor nano-fabrication technologies. Here, following the synthesis of solvent-stable 2D-fluorinated phenethylammonium lead iodide perovskite (F-PEA)2PbI4 (F-PEAI), planar photodetectors entirely fabricated in atmosphere is demonstrated, exhibiting figures of merit rivalling those of commercial silicon photodiodes. A record large room temperature detectivity (>5 × 1017 Jones), a fast time photoresponse (rise time 1.5 ns), an extraordinarily large linear dynamic range (228 dB), as well as a photo-responsivity of ≈ 1100 AW−1 are demonstrated for devices on a range of substrates including flexible wearable media without the need for any planarization or any atomically thin dielectric, in stark contrast to other 2D semiconductors. Finally, the suitability of nano-scale 2D F-PEAI photodetector arrays with sub-wavelength pixel size of just 100 nm of use for high definition imaging is demonstrated. 相似文献
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Yuan-Wen Hsiao Bi Shane Cheng Hung-Chieh Hsu Shih-Hsiung Wu Hsuan-Ta Wu Ching-Chich Leu Chuan-Feng Shih 《Advanced functional materials》2023,33(21):2300169
This research demonstrates a state-of-the-art vertical-transport photodetector with an n-type 3D MAPbI3/p-type quasi-2D (Q-2D) BA2MA2Pb3I10 perovskite heterojunction. This structure introduces a ≈0.6 V built-in electric field at the n-p junction that greatly improves the characteristics of the perovskite photodetector, and the presence of Q-2D perovskite on the surface improves the life. The electrical polarities of the 3D and the Q-2D perovskite layers are simply controlled by self-constituent doping, making clearly defined n-p characteristics. Doctor-blade coating is used to fabricate the photodetector with a large area. The Q-2D materials with highly oriented (040) Q-2D (n = 2,3) planes are near the surface, and the (111) preferred planes mixed with high index Q-2D materials (n = 4,5) are found near the 3D/Q-2D interface. The stacking and interface are beneficial for carrier extraction and transport, yielding an external quantum efficiency of 77.9%, a carrier lifetime long as 295.7 ns, and a responsibility of 0.41 A W−1. A low dark current density of 6.2 × 10−7 mA cm−2 and a high detectivity of 2.82 × 1013 Jones are obtained. Rise time and fall time are fast as 1.33 and 10.1 µs, respectively. The results show the application potential of 3D/Q-2D n-p junction perovskite photodetectors. 相似文献
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采用自动送粉激光熔覆技术,在A3钢表面进行了Ni60合金添加Al2O3的激光熔覆试验,通过对工艺参数和Al2O3含量的选取,获得了性能改善的激光熔覆层。对熔覆层横截面进行了硬度测试和显微组织分析,对熔覆层表面进行了X射线衍射物象分析和摩擦磨损试验。结果表明:与纯Ni60激光熔覆层相比,添加适量Al2O3的Ni60激光熔覆层的平均硬度提高300Hv0.3,耐磨性提高4倍。分析认为,Al2O3能够大大提高Ni60激光熔覆层硬度和耐磨性的原因在于:适量Al2O3的加入,可抑制涂层中粗大的脆性硬质相的形成,起到细化晶粒的作用:而形成的Al2Cr4C2细小颗粒增强相均匀弥散分布在组织中,不容易脱落,很好的起着均匀载荷和减摩抗磨作用。 相似文献
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通过改变球磨时间,得到不同粒度的B2O3-Al2O3-SiO2(简称B-Al-Si或BAS)玻璃粉料。在玻璃粉料中混入质量分数为40%的Al2O3陶瓷粉末,用流延法制备了低温共烧BAS/Al2O3玻璃/陶瓷复相材料。研究了烧结温度和玻璃的粒度对复相材料的烧结性能、介电性能和热稳定性的影响。结果表明:在800～900℃,材料致密化后析出钙长石晶体;球磨1h的玻璃粉料与w(Al2O3)40%混合烧结的复相材料的性能最优,850℃保温30min后,于10MHz测试,其εr=7.77,tanδ=1×10-4;扫描电镜显示其微观结构致密,有少量闭气孔。 相似文献
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Mingfa Peng Yulong Ma Lei Zhang Shan Cong Xuekun Hong Yiheng Gu Yawei Kuang Yushen Liu Zhen Wen Xuhui Sun 《Advanced functional materials》2021,31(42):2105051
Perovskites have attracted intensive attention as promising materials for the application in various optoelectronic devices due to their large light absorption coefficient, high carrier mobility, and long charge carrier diffusion length. However, the performance of the pure perovskite nanocrystals-based device is extremely restricted by the limited charge transport capability due to the existence of a large number of the grain boundary between perovskite nanocrystals. To address these issues, a high-performance photodetector based on all-inorganic CsPbBr3 perovskite nanocrystals/2D non-layered cadmium sulfide selenide heterostructure has been demonstrated through energy band engineering with designed typed-II heterostructure. The photodetector exhibits an ultra-high light-to-dark current ratio of 1.36 × 105, a high responsivity of 2.89 × 102 A W−1, a large detectivity of 1.28 × 1014 Jones, and the response/recovery time of 0.53s/0.62 s. The enhancement of the optoelectronic performance of the heterostructure photodetector is mainly attributed to the efficient charge carrier transfer ability between the all-inorganic CsPbBr3 perovskites and 2D cadmium sulfide selenide resulting from energy band alignment engineering. The charge carriers’ transfer dynamics and the mechanism of the CsPbBr3 perovskites/2D non-layered nanosheets interfaces have also been studied by state-state PL spectra, fluorescence lifetime imaging microscopy, time-resolved photoluminescence spectroscopy, and Kelvin probe force microscopy measurements. 相似文献
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Tao Wang Daming Zheng Karol Vegso Nada Mrkyvkova Peter Siffalovic Thierry Pauporté 《Advanced functional materials》2023,33(43):2304659
The development of an efficient fabrication route to achieve high-resolution perovskite pixel array is key for large-scale flexible image sensor devices. Herein, a high-resolution and stable 10 × 10 flexible PDs array based on formamidinium(FA+) and phenylmethylammonium (PMA+) quasi-2D (PMA)2FAPb2I7 (n = 2) perovskite is demonstrated by developing SiO2-assisted hydrophobic and hydrophilic treatment process on polyethylene terephthalate substrate. By introducing Au nanoparticles (Au NPs), the perovskite film quality is improved and grain boundaries are reduced. The mechanism by which Au NPs upgrade the photoelectric quality of perovskite is mainly revealed by glow discharge-optical emission spectroscopy (GD-OES) and grazing-incidence wide-angle X-ray scattering (GIWAXS). To further improve the photoelectric performance of the devices, a post-treatment strategy with formamidinium chloride (FACl) is used . The optimized flexible PDs arrays show excellent optoelectronic properties with a high responsivity of 4.7 A W−1, a detectivity of 6.3 × 1012 Jones, and a broad spectral sensitivity. The device also exhibits excellent electrical stability even under severe bending and excellent flexural strength, as well as excellent environmental stability. Finally, the integrated flexible PDs arrays are used as sensor pixels in an imaging system to obtain high-resolution imaging patterns, demonstrating the imaging capability of the PDs arrays. 相似文献
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Yuchao Liang Fangzhou Liu Xixi Xie Yingzhuang Ma Yan Guan Wenjin Yu Yu Zou Lingling Zhang Xian Zhang Yangyang Zhang Bohan Li Cuncun Wu Kezhu Jiang Lixin Xiao Dechun Zou Shijian Zheng 《Advanced functional materials》2024,34(36):2401257
2D Ruddlesden–Popper (RP) layered metal-halide perovskites have garnered significant interest due to their unique photoelectric properties and excellent stability. However, 2D perovskite films prepared via solution process generally exhibit multi-quantum well structure with random well width distribution, which significantly impedes the carrier transportation. Herein, the synthesis of phase-pure 2D (PEA)2FAPb2I7 (PEA = C8H11N, FA = CH4N2) perovskite thin films is reported in ambient environment achieved by suppressing the formation of the 3D perovskite phase. First, incorporation of MACl additive can effectively regulate the intermediate during crystallization, facilitating the formation of a metastable 3D MAxFA1-xPbIyCl3-y phase. Second, precise control of environmental humidity is employed to further inhibit the formation of α-FAPbI3 phase. As a result, the perovskite intermediate composed of predominantly metastable 3D phase and 2D n = 2 phase is achieved, which is eventually transformed into 2D n = 2 perovskite during annealing, leading to markedly enhanced phase purity. Photoconductive-type photodetectors based on the phase-pure 2D RP perovskite films are fabricated, demonstrating a high detectivity of over 9.4 × 1012 Jones due to the improved carrier transportation. This study provides a comprehensive insight into the crystallization process of phase-pure 2D perovskites. 相似文献
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The presence of 2D electron gas (2DEG) at the interface between an amorphous Al2O3 (a‐AO) thin film and an anatase TiO2 (TO) thin film is demonstrated. The a‐AO and TO thin films are prepared via atomic layer deposition on a SrTiO3 (STO) single crystal substrate. The reduction of the TO surface during the a‐AO deposition produces oxygen vacancies, which are effective electron donors. The systematic analysis of the physical properties of the TO layer reveals that the crystallinity of the TO layer affects the conductivity, carrier concentration and the mobility of the 2DEG, and also the critical a‐AO thickness, which is the minimum thickness for exhibiting the apparent conductivity. The 2DEG between the a‐AO and the sufficiently thick TO layer exhibits an almost two‐orders‐of‐magnitude‐higher carrier concentration (≈1014 cm‐2) than the previously reported 2DEG at a‐AO/STO, while the mobility (≈10° cm2 V‐1 s‐1) is relatively low. Also, angle‐resolved X‐ray photoelectron spectroscopy elucidates the spatial distribution and atomic ratio of the reduced Ti ions. Due to the increasing fraction of the anatase phase in the TO layer, the oxygen vacancies are prone to ionize, and the carriers are better confined to the interface, making them more 2DEG‐like. 相似文献
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采用高分子网络凝胶法直接制备YAG纳米粉体，XRD结果表明，所得粉体具纯的YAG相，平均粒径在30nm。通过热压烧结得到了致密YAG／Al2O3烧结体。所得的致密体材料为晶内型和晶间型混合分布。其抗弯强度达498．56MPa，比单相Al2O3陶瓷有大幅度提高。 相似文献
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Anurag Krishna Sbastien Gottis Mohammad Khaja Nazeeruddin Frdric Sauvage 《Advanced functional materials》2019,29(8)
The cost‐effective processability and high efficiency of the organic–inorganic metal halide perovskite solar cells (PSCs) have shown tremendous potential to intervene positively in the generation of clean energy. However, prior to an industrial scale‐up process, there are certain critical issues such as the lack of stability against over moisture, light, and heat, which have to be resolved. One of the several proposed strategies to improve the stability that has lately emerged is the development of lower‐dimensional (2D) perovskite structures derived from the Ruddlesden–Popper (RP) phases. The excellent stability under ambient conditions shown by 2D RP phase perovskites has made the scalability expectations burgeon since it is one of the most credible paths toward stable PSCs. In this review, the 2D/3D mixed system for photovoltaics (PVs) is elaborately discussed with the focus on the crystal structure, optoelectronic properties, charge carrier dynamics, and their impact on the photovoltaic performances. Finally, some of the further challenges are highlighted while outlining the perspectives of 2D/3D perovskites for high‐efficiency stable solar cells. 相似文献
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Organic-inorganic hybrid perovskite solar cells (PSCs) with unique properties exhibit their powerful competitiveness in the photovoltaic field over the past few years. However, the challenges of stability for perovskite devices limit the commercialization and further development. The 2D/3D hybrid structures combine the superior efficiency of bulk perovskites and the superior stability of layered perovskites and gradually get hotspots of the photovoltaic field. In addition, there remains a lack of comprehensive understanding and systematic summary of the function of 2D perovskite attributed to the complex nature of 2D/3D structures. Here, the latest progress of 2D/3D hybrid structures and focus on the functionality of 2D phases in mixed structures and the underlying mechanism from the perspective of their different distributions in the perovskite layer is summarized. Then, the insight and vital factors for overall improvements in the stability of 2D/3D structures are thoroughly discussed. Finally, it is expected that this review will contribute to the present challenges and future research prospects in the photovoltaic industry. 相似文献
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制备了具有不同Al2O3含量的(Ca0.7Nd0.3)(Ti0.7Al0.3)O3微波介质陶瓷,并通过XRD、SEM、能谱分析(EDS)及材料介电性能测试结果的分析研究了Al2O3对陶瓷体烧结性能、介电性能和显微结构的影响.结果发现,添加Al2O3后体系主晶相未发生改变,仍为正交钙钛矿结构.Al2O3的添加促进了晶粒的生长,有效地降低了体系的烧结温度,材料的介电常数不随Al2O3的添加发生明显变化,但其品质因数与对应频率的乘积(Q×f)值则随添加量的增大呈先上升后减小的趋势,最高可达25 153 GHz. 相似文献
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Saba Gharibzadeh Ihteaz M. Hossain Paul Fassl Bahram Abdollahi Nejand Tobias Abzieher Moritz Schultes Erik Ahlswede Philip Jackson Michael Powalla Sren Schfer Michael Riencker Tobias Wietler Robby Peibst Uli Lemmer Bryce S. Richards Ulrich W. Paetzold 《Advanced functional materials》2020,30(19)
Wide‐bandgap perovskite solar cells (PSCs) with optimal bandgap (Eg) and high power conversion efficiency (PCE) are key to high‐performance perovskite‐based tandem photovoltaics. A 2D/3D perovskite heterostructure passivation is employed for double‐cation wide‐bandgap PSCs with engineered bandgap (1.65 eV ≤ Eg ≤ 1.85 eV), which results in improved stabilized PCEs and a strong enhancement in open‐circuit voltages of around 45 mV compared to reference devices for all investigated bandgaps. Making use of this strategy, semitransparent PSCs with engineered bandgap are developed, which show stabilized PCEs of up to 25.7% and 25.0% in four‐terminal perovskite/c‐Si and perovskite/CIGS tandem solar cells, respectively. Moreover, comparable tandem PCEs are observed for a broad range of perovskite bandgaps. For the first time, the robustness of the four‐terminal tandem configuration with respect to variations in the perovskite bandgap for two state‐of‐the‐art bottom solar cells is experimentally validated. 相似文献
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Bolun Li Xi Huang Xiang Wu Qiong Zuo Yunhao Cao Qi Zhu Yaohui Li Yuanhuan Xu Guanhaojie Zheng Dongcheng Chen Xu-Hui Zhu Fei Huang Hongyu Zhen Lintao Hou Jian Qing Wanzhu Cai 《Advanced functional materials》2023,33(28):2300216
Quasi-two-dimensional (Q-2D) perovskites are emerging as one of the most promising materials for photodetectors. However, a significant challenge to Q-2D perovskites for photodetection is their insufficient charge transport ability, which is mainly attributed to their hybrid low-dimensional n-phase structure. This study demonstrates that evenly-distributed 3D-like phases with vertical orientation throughout the film can greatly facilitate charge transport and suppress charge recombination, outperforming the prevalent phase structure with a vertical dimension gradient. Based on such a phase structure, a Q-2D Ruddlesden−Popper perovskite self-powered photodetector achieving a combination of exceptional figures-of-merit is realized, including a responsivity of 0.45 AW−1, a peak specific detectivity of 2.3 × 1013 Jones, a 156 dB linear dynamic range, and a rise/fall time of 2.89 µs/1.93 µs. The desired phase structure is obtained by utilizing a double-hole transport layer (HTL), combining hydrophobic PTAA and hydrophilic PEDOT: PSS. Besides, the dependence of the hybrid low-dimensional phase structure is also identified on the surface energy of the buried HTL substrate. This study gives insight into the correlation between Q-2D perovskites’ phase structure and performance, providing a valuable design guide for Q-2D perovskite-based photodetectors. 相似文献
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