scholarly journals Low-Temperature Induced Enhancement of Photoelectric Performance in Semiconducting Nanomaterials

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1131
Author(s):  
Liyun Wu ◽  
Yun Ji ◽  
Bangsen Ouyang ◽  
Zhengke Li ◽  
Ya Yang
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
High Performance ◽  
High Efficiency ◽  
Extreme Conditions ◽  
Photoelectric Conversion ◽  
Working Mechanism ◽  
Innovative Strategy ◽  
Photoelectric Performance ◽  
Potential Applications

The development of light-electricity conversion in nanomaterials has drawn intensive attention to the topic of achieving high efficiency and environmentally adaptive photoelectric technologies. Besides traditional improving methods, we noted that low-temperature cooling possesses advantages in applicability, stability and nondamaging characteristics. Because of the temperature-related physical properties of nanoscale materials, the working mechanism of cooling originates from intrinsic characteristics, such as crystal structure, carrier motion and carrier or trap density. Here, emerging advances in cooling-enhanced photoelectric performance are reviewed, including aspects of materials, performance and mechanisms. Finally, potential applications and existing issues are also summarized. These investigations on low-temperature cooling unveil it as an innovative strategy to further realize improvement to photoelectric conversion without damaging intrinsic components and foresee high-performance applications in extreme conditions.

scholarly journals High-Efficiency All-Dielectric Metasurfaces for the Generation and Detection of Focused Optical Vortex for the Ultraviolet Domain

2020 ◽  
Vol 10 (16) ◽  
pp. 5716
Author(s):  
Ziheng Zhang ◽  
Tong Li ◽  
Xiaofei Jiao ◽  
Guofeng Song ◽  
Yun Xu
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Dielectric Material ◽  
Optical Vortex ◽  
Magnetic Dipoles ◽  
Half Wave ◽  
Potential Applications ◽  
On Chip ◽  
High Flexibility ◽  
Meta Atom

The optical vortex (OV) has drawn considerable attention owing to its tremendous advanced applications, such as optical communication, quantum entanglement, and on-chip detectors. However, traditional OV generators suffer from a bulky configuration and limited performance, especially in the ultraviolet range. In this paper, we utilize a large bandgap dielectric material, niobium pentoxide (Nb2O5), to construct ultra-thin and compact transmission-type metasurfaces to generate and detect the OV at a wavelength of 355 nm. The meta-atom, which operates as a miniature half-wave plate and demonstrates a large tolerance to fabrication error, manipulates the phase of an incident right-handed circular polarized wave with high cross-polarized conversion efficiency (around 86.9%). The phase delay of π between the orthogonal electric field component is attributed to the anti-parallel magnetic dipoles induced in the nanobar. Besides, focused vortex generation (topological charge l from 1 to 3) and multichannel detection (l from −2 to 2) are demonstrated with high efficiency, up to 79.2%. We envision that our devices of high flexibility may have potential applications in high-performance micron-scale integrated ultraviolet nanophotonics and meta-optics.

Low-temperature interfacial engineering for flexible CsPbI2Br perovskite solar cells with high performance beyond 15%

2020 ◽  
Vol 8 (10) ◽  
pp. 5308-5314 ◽  
Author(s):  
Xia Yang ◽  
Hanjun Yang ◽  
Xiaotian Hu ◽  
Wenting Li ◽  
Zhimin Fang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Low Temperature ◽  
High Performance ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Interfacial Engineering ◽  
Doped Zno

High-efficiency flexible CsPbI2Br PSCs are designed by introducing Al-doped ZnO as an electron-transport layer and tert-butyl cyanoacetate as a hole passivation layer. The optimized PSC exhibits outstanding stability and a champion PCE of 15.08%.

scholarly journals Radially oriented mesoporous TiO2 microspheres with single-crystal–like anatase walls for high-efficiency optoelectronic devices

2015 ◽  
Vol 1 (4) ◽  
pp. e1500166 ◽  
Author(s):  
Yong Liu ◽  
Renchao Che ◽  
Gang Chen ◽  
Jianwei Fan ◽  
Zhenkun Sun ◽  
...  
Keyword(s):  
Single Crystal ◽  
Mesoporous Materials ◽  
High Performance ◽  
High Efficiency ◽  
Dye Sensitized Solar Cells ◽  
Building Blocks ◽  
Accessible Surface Area ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Assembly Method

Highly crystalline mesoporous materials with oriented configurations are in demand for high-performance energy conversion devices. We report a simple evaporation-driven oriented assembly method to synthesize three-dimensional open mesoporous TiO2 microspheres with a diameter of ~800 nm, well-controlled radially oriented hexagonal mesochannels, and crystalline anatase walls. The mesoporous TiO2 spheres have a large accessible surface area (112 m2/g), a large pore volume (0.164 cm3/g), and highly single-crystal–like anatase walls with dominant (101) exposed facets, making them ideal for conducting mesoscopic photoanode films. Dye-sensitized solar cells (DSSCs) based on the mesoporous TiO2 microspheres and commercial dye N719 have a photoelectric conversion efficiency of up to 12.1%. This evaporation-driven approach can create opportunities for tailoring the orientation of inorganic building blocks in the assembly of various mesoporous materials.

scholarly journals In-situ formed and low-temperature deposited Nb: TiO2 compact-mesoporous layer for hysteresis-less perovskite solar cells with high performance

2020 ◽  
Author(s):  
Miao Yu ◽  
Haoxuan Sun ◽  
Xiaona Huang ◽  
Yichao Yan ◽  
Wanli Zhang
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
High Performance ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
High Power Conversion Efficiency ◽  
Mesoporous Structures

Abstract Recently, reported perovskite solar cells (PSCs) with high power conversion efficiency (PCE) are mostly based on mesoporous structures containing mesoporous titanium oxide (TiO 2 ) which is the main factor to reduce the overall hysteresis. However, existing fabrication approaches for mesoporous TiO 2 generally require a high temperature (>450 °C) annealing process. Moreover, there is still plenty of scope for improvement in terms of increasing the electron conductivity and reducing the carrier recombination. Herein, a facile one-step, in situ and low-temperature method was developed to prepare an Nb:TiO 2 compact-mesoporous layer to serve as both a scaffold and an electron transport layer (ETL) in PSCs. The Nb:TiO 2 compact-mesoporous layer based PSCs exhibit suppressed hysteresis, which is attributed to the synergistic effect of the large interface surface area caused by nano-pin morphology on the surface and the improved carrier transportation caused by the presence of Nb. Such a high-quality compact-mesoporous layer allows the PSC achieve a remarkable PCE of 19.74%. This work promises an effective approach for creating hysteresis-less and high-efficiency PSCs based on compact-mesoporous structures with lower energy consumption and cost.

scholarly journals Low-Powered Photodetector Based on Two-Dimensional InS0.3Se0.7/WS2 Heterostructure

2021 ◽  
Vol 13 (12) ◽  
pp. 6883
Author(s):  
Kaiting Zhang ◽  
Jie Chang ◽  
Chaoyang Tan ◽  
Hui Han
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Lattice Mismatch ◽  
Response Speed ◽  
Building Blocks ◽  
Two Dimensional ◽  
Photoelectric Properties ◽  
Two Dimensional Materials ◽  
Potential Applications ◽  
Vdw Heterostructure

Photodetectors based on two-dimensional (2D) materials have great potential applications in the field of new energy, such as fuel cells, solar cells, and other fields. Van der Waals (vdW) heterojunction photodiodes are expected to be one of the promising applications of two-dimensional materials due to the photoelectric properties without consideration of lattice mismatch. High-efficiency photoelectric sensors based on two-dimensional materials have great significance to reducing the energy consumption of devices. Here, we build a complex vdW heterostructure by combining InS0.3Se0.7 with another suitable 2D material WS2. Few-layer graphite was used as electrodes to enhance the optoelectronic performance of indium monochalcogenides. Evident photocurrent is observed in the InS0.3Se0.7/WS2 vdW heterostructure device arising from the formed p–n junction at the interface. The uniformity and photoresponse of the InS0.3Se0.7/WS2 vdW heterostructure has been further investigated by the photocurrent mapping. It shows that the entire photovoltaic current was originated from the InS0.3Se0.7/WS2 vdW heterojunction by scanning photocurrent microscope images. Furthermore, the response speed is enhanced at small bias voltage. The transient photoresponse can be well reproduced in almost 100 cycles, indicating the good repeatable optoelectronic performance. Our study indicates that the as-prepared InS0.3Se0.7/WS2 vdW heterostructures are attractive building blocks for photodetectors application. Our findings will open up a new way to further develop high-performance, low-power, and energy-efficient photodetectors based on indium monochalcogenides.

Low-temperature solution-processed efficient electron-transporting layers based on BF4−-capped TiO2 nanorods for high-performance planar perovskite solar cells

2018 ◽  
Vol 6 (2) ◽  
pp. 334-341 ◽  
Author(s):  
Zhang Lan ◽  
Xiaoxia Xu ◽  
Xuezhen Zhang ◽  
Jie Tang ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Consumption ◽  
Low Temperature ◽  
High Performance ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Cost Effective ◽  
Low Energy ◽  
Low Energy Consumption ◽  
Temperature Solution

To fabricate cost-effective solar cells, some prerequisites such as low-energy consumption, simplified technological processes, and high efficiency must be achieved.

scholarly journals In-situ formed and low-temperature deposited Nb: TiO2 compact-mesoporous layer for hysteresis-less perovskite solar cells with high performance

2020 ◽  
Author(s):  
Miao Yu ◽  
Haoxuan Sun ◽  
Xiaona Huang ◽  
Yichao Yan ◽  
Wanli Zhang
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
High Performance ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
High Power Conversion Efficiency ◽  
Mesoporous Structures

Abstract Recently, reported perovskite solar cells (PSCs) with high power conversion efficiency (PCE) are mostly based on mesoporous structures containing mesoporous titanium oxide (TiO2 ) which is the main factor to reduce the overall hysteresis. However, existing fabrication approaches for mesoporous TiO2 generally require a high temperature annealing process. Moreover, there is still a long way to go for improvement in terms of increasing the electron conductivity and reducing the carrier recombination. Herein, a facile one-step, in situ and low-temperature method was developed to prepare an Nb: TiO2 compact-mesoporous layer to serve as both scaffold and electron transport layer (ETL) in PSCs. The Nb: TiO2 compact-mesoporous ETL based PSCs exhibit suppressed hysteresis, which is attributed to the synergistic effect of the large interface surface area caused by nano-pin morphology and the improved carrier transportation caused by Nb doping. Such a high-quality compact-mesoporous layer allows the PSC to achieve a remarkable PCE of 19.74%. This work promises an effective approach for creating hysteresis-less and high-efficiency PSCs based on compact-mesoporous structures with lower energy consumption and cost.

Insights into the photoelectric properties of the SnF2 and SnF4-doped FASnI3 Perovskite NanoFilm

2020 ◽  
Vol 16 ◽  
Author(s):  
Liping Peng ◽  
Wei Xie
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Correction Method ◽  
Photoelectric Conversion Efficiency ◽  
Generalized Gradient ◽  
Photoelectric Conversion ◽  
Photoelectric Properties ◽  
Photoelectric Performance ◽  
Negative Effect

Background: In this article, experimentally, we fabricated the FASnI3 perovskite solar cells base on the SnF2 and SnF4-doped FASnI3 nano-thin film materials, and got the photoelectric conversion efficiency (PCE) were 6.5 % and 5.59 %, respectively. Theoretically, we wanted to know why the PCE of SnF2-doped FASnI3 is higher than the SnF4- doped FASnI3. Methods: We built three kinds of model structures by the CASTEP, they were undoped and SnF2 and SnF4 doped FASnI3 perovskite structure models, respectively. The method was ultrasoft to calculate the interaction between electron-ion, with an electron exchange correction method of generalized gradient approximation and Perdew-Burke-Emzerhof method. Results: We found the probabilities of energy transfer between SnF2 molecule and around it molecules were the lowest among three structures. By integratedly analyzing optical properties, band structures, effective masses, and density of states (DOS) et al, we considered that SnF2 doping was superior to SnF4 doping in maintaining photoelectric properties of FASnI3. In addition, SnF2-doped FASnI3 possesses smaller hole effective mass than SnF4-dopedFASnI3, adding Sn4+ ion into perovskite as an shallow acceptor energy level can effectively reduce the optical absorption properties, however, adding Sn2+ ion into perovskite at an appropriate proportion can enhance its photoelectric performance of FASnI3. Conclusion: Sn4+ doping is a negative effect, and the Sn2+ doping is positive effect in promoting the photoelectric performance of FASnI3 perovskite. We considered that SnF2 doping was superior to SnF4 doping in maintaining photoelectric properties of FASnI3. We hope our results can help to deeply understand on Sn2+ and Sn4+ ion promoting the stability and high efficiency of FASnI3, and help strive to develop the lead-free perovskite solar cells.

To Demonstrate the Potential Application of “Low Temperature and High Performance Silicon Heterojunction Solar Cells Fabricated Using HWCVD” in Wireless Sensor Network: An Initial Research

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Mohit Agarwal ◽  
Amit Munjal ◽  
Rajiv Dusane
Keyword(s):  
Solar Cells ◽  
Wireless Sensor Network ◽  
Energy Harvesting ◽  
Low Temperature ◽  
Sensor Network ◽  
Alternative Energy ◽  
High Performance ◽  
High Efficiency ◽  
Wireless Sensor ◽  
Processing Temperature

Wireless sensor network (WSN) is widely used in a variety of applications including habitat monitoring, military surveillance, environmental monitoring, scientific applications, etc. The major limitation of WSN is that sometimes it is not feasible to replace or recharge the battery once it gets fully exhausted and thus, it limits the lifetime of WSN. One of the possible solutions to overcome this limitation is to incorporate any energy harvesting device, which can use the alternative energy sources to charge the battery. However, the processing temperature and the performance of energy harvesting devices limit their applications. In this paper, low temperature and high performance single-sided silicon heterojunction (SHJ) solar cells are fabricated with 13% efficiency using hot-wire chemical vapor deposition (HWCVD) method. This paper also describes an energy management model that successfully addresses the various issues in the existing energy harvesting models. In order to implement the proposed model, the results show that the high efficiency SHJ solar cells are best suitable candidate as an energy harvesting device that can be incorporated inside the node. The subsequent analysis shows that the consumed power per day by the node can be successfully recovered from the SHJ solar cells, if the sunlight is available only for 25 min in a day with 100 mW/cm2 intensity. This clearly indicates that the node's battery will remain fully charged if the above said condition is satisfied, which seems to be very feasible. Finally, one can conclude that the node functioning will remain active till the battery lifetime i.e., approximately 30 years for Li-ion battery.

A Simple Method to Prepare Raw Dehydrated Potato Flour by Low-Temperature Vacuum Drying

2017 ◽  
Vol 13 (11) ◽  
Author(s):  
Cheng-Yu Jin ◽  
Dan Xu ◽  
Fan-kui Zeng ◽  
Yu-ci Zhao ◽  
Yan-chen Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Potato Starch ◽  
Vacuum Drying ◽  
Trypsin Inhibitor Activity ◽  
Potato Flour ◽  
Simple Method ◽  
Potential Applications ◽  
Cie Chromaticity ◽  
Processing Properties

AbstractA simple method called low-temperature vacuum drying (LTVD) was used to produce a novel dehydrated potato flour called raw dehydrated potato flour (RDPF). Preparing RDPF by LTVD at 60°C, 70°C and 80°C in both slice and dice shape was investigated. Potato samples in dice shape are easier dehydrating than in slice shape, the starch granules of RDPF maintain ellipsoid shape as the native potato starch. The best temperature of LTVD to prepare the RDPF is around 70°C according to CIE chromaticity results. Dehydrate at 60°C in dice shape, 88.37% of the trypsin inhibitor activity of the fresh potato is maintained. The Mixolab curve shows that the RDPF has some similar rheological properties of the wheat flour. Protein undenatured, starch ungelatinized, with the high performance of processing properties, RDPF has a number of potential applications in the potato staple food manufacture.

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