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3. Current-induced magnetization switching in a chemically disordered A1 CoPt single layer

Author

Chen, Zehan, Liu, Lin, Ye, Zhixiang, Chen, Zhiren, Zheng, Hongnan, Jia, Wei, Zeng, Qi, Wang, Ning, Xiang, Boyuan, Lin, Tao, Liu, Jing, Qiu, Mingxia, Li, Shunpu, Shi, Ji, Han, Peigang, and An, Hongyu

Subjects
Condensed Matter - Materials Science
Abstract

We report the first demonstration of the current-induced magnetization switching in a perpendicularly magnetized A1 CoPt single layer. We show that good perpendicular magnetic anisotropy can be obtained in a wide composition range of the A1 Co1-xPtx single layers, which allows to fabricate perpendicularly magnetized CoPt single layer with composition gradient to break the inversion symmetry of the structure. By fabricating the gradient CoPt single layer, we have evaluated the SOT efficiency and successfully realized the SOT-induced magnetization switching. Our study provides an approach to realize the current-induced magnetization in the ferromagnetic single layers without attaching SOT source materials.

Published
2021

21. Enhancing Magnetic Ordering in Cr-doped Bi2Se3 using High-TC Ferrimagnetic Insulator

Author

Liu, Wenqing, He, Liang, Xu, Yongbing, Murata, Koichi, Onbasli, Mehmet C., Lang, Murong, Maltby, Nick J., Li, Shunpu, Wang, Xuefeng, Ross, Caroline A., Bencok, Peter, van der Laan, Gerrit, Zhang, Rong, and Wang, Kang. L.

Subjects
Condensed Matter - Materials Science
Abstract

We report a study of enhancing the magnetic ordering in a model magnetically doped topological insulator (TI), Bi2-xCrxSe3, via the proximity effect using a high-TC ferrimagnetic insulator Y3Fe5O12. The FMI provides the TI with a source of exchange interaction yet without removing the nontrivial surface state. By performing the elemental specific X-ray magnetic circular dichroism (XMCD) measurements, we have unequivocally observed an enhanced TC of 50 K in this magnetically doped TI/FMI heterostructure. We have also found a larger (6.6 nm at 30 K) but faster decreasing (by 80% from 30 K to 50 K) penetration depth compared to that of diluted ferromagnetic semiconductors (DMSs), which could indicate a novel mechanism for the interaction between FMIs and the nontrivial TIs surface.

Published
2015
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22. Toluene Processed All‐Polymer Solar Cells with 18% Efficiency and Enhanced Stability Enabled by Solid Additive: Comparison Between Sequential‐Processing and Blend‐Casting.

Author

Zhang, Guoping, Zhao, Chaoyue, Zhu, Liangxiang, Wang, Lihong, Xiong, Wenzhao, Hu, Huawei, Bai, Qing, Wang, Yaping, Xie, Chen, You, Peng, Yan, He, Wu, Dan, Yang, Tao, Qiu, Mingxia, Li, Shunpu, and Zhang, Guangye

Subjects
SOLAR cell efficiency, ENERGY levels (Quantum mechanics), TOLUENE, SOLAR cells, AROMATIC compounds
Abstract

The emergence of polymerized small molecule acceptors (PSMAs) has significantly improved the performance of all‐polymer solar cells (all‐PSCs). However, the pace of device engineering lacks behind that of materials development, so that a majority of the PSMAs have not fulfilled their potentials. Furthermore, most high‐performance all‐PSCs rely on the use of chloroform as the processing solvent. For instance, the recent high‐performance PSMA, named PJ1‐γ, with high LUMO, and HOMO levels, could only achieve a PCE of 16.1% with a high‐energy‐level donor (JD40) using chloroform. Herein, we present a methodology combining sequential processing (SqP) with the addition of 0.5%wt PC71BM as a solid additive (SA) to achieve an impressive efficiency of 18.0% for all‐PSCs processed from toluene, an aromatic hydrocarbon solvent. Compared to the conventional blend‐casting (BC) method whose best efficiency (16.7%) could only be achieved using chloroform, the SqP method significantly boosted the device efficiency using toluene as the processing solvent. In addition, the donor we employ is the classic PM6 that has deeper energy levels than JD40, which provides low energy loss for the device. We compare the results with another PSMA (PYF‐T‐o) with the same method. Finally, an improved photostability of the SqP devices with the incorporation of SA is demonstrated. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Water-based layer-by-layer processing enables 19 % efficient binary organic solar cells with minimized thickness sensitivity

Author

Xie, Chen, primary, Zeng, Xianghui, additional, Li, Chengsheng, additional, Sun, Xiaokang, additional, Liang, Songqiang, additional, Huang, Hui, additional, Deng, Baoshen, additional, Wen, xuanlin, additional, Zhang, Guangye, additional, You, Peng, additional, Yang, Chuqun, additional, Han, Yulai, additional, Li, Shunpu, additional, Lu, Guanghao, additional, Hu, Hanlin, additional, Li, Ning, additional, and Chen, Yiwang, additional

Published
2024
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27. Toluene Processed All‐Polymer Solar Cells with 18% Efficiency and Enhanced Stability Enabled by Solid Additive: Comparison Between Sequential‐Processing and Blend‐Casting

Author

Zhang, Guoping, primary, Zhao, Chaoyue, additional, Zhu, Liangxiang, additional, Wang, Lihong, additional, Xiong, Wenzhao, additional, Hu, Huawei, additional, Bai, Qing, additional, Wang, Yaping, additional, Xie, Chen, additional, You, Peng, additional, Yan, He, additional, Wu, Dan, additional, Yang, Tao, additional, Qiu, Mingxia, additional, Li, Shunpu, additional, and Zhang, Guangye, additional

Published
2023
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28. All-Polymer Solar Cells Sequentially Solution Processed from Hydrocarbon Solvent with a Thick Active Layer

Author

Wang, Yajie, primary, Zhao, Chaoyue, additional, Cai, Ziqi, additional, Wang, Lihong, additional, Zhu, Liangxiang, additional, Huang, Hui, additional, Zhang, Guoping, additional, You, Peng, additional, Xie, Chen, additional, Wang, Yaping, additional, Bai, Qing, additional, Yang, Tao, additional, Li, Shunpu, additional, and Zhang, Guangye, additional

Published
2023
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29. 18.1% Ternary All‐Polymer Solar Cells Sequentially Processed from Hydrocarbon Solvent with Enhanced Stability

Author

Zhao, Chaoyue, primary, Ma, Ruijie, additional, Hou, Yiwen, additional, Zhu, Liangxiang, additional, Zou, Xinhui, additional, Xiong, Wenzhao, additional, Hu, Huawei, additional, Wang, Lihong, additional, Yu, Han, additional, Wang, Yajie, additional, Zhang, Guoping, additional, Yi, Jicheng, additional, Chen, Lu, additional, Wu, Dan, additional, Yang, Tao, additional, Li, Gang, additional, Qiu, Mingxia, additional, Yan, He, additional, Li, Shunpu, additional, and Zhang, Guangye, additional

Published
2023
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30. A Water-Processed Mesoscale Structure Enables 18.5% Efficient Binary Layer-by-Layer Organic Solar Cells.

Author

Xie, Chen, Huang, Hui, Li, Zijian, Zeng, Xianghui, Deng, Baoshen, Li, Chengsheng, Zhang, Guangye, and Li, Shunpu

Subjects
SOLAR cells, CHARGE carrier mobility, MANUFACTURING processes, PHOTOVOLTAIC power systems, PHASE separation, NANOPARTICLES
Abstract

The two-step layer-by-layer (LBL) deposition of donor and acceptor films enables desired vertical phase separation and high performance in organic solar cells (OSCs), which becomes a promising technology for large-scale printing devices. However, limitations including the use of toxic solvents and unpredictable infiltration between donor and acceptor still hinder the commercial production of LBL OSCs. Herein, we developed a water-based nanoparticle (NP) ink containing donor polymer to construct a mesoscale structure that could be infiltrated with an acceptor solution. Using non-halogen o-xylene for acceptor deposition, the LBL strategy with a mesoscale structure delivered outstanding efficiencies of 18.5% for binary PM6:L8-BObased LBL OSCs. Enhanced charge carrier mobility and restricted trap states were observed in the meso-LBL devices with optimized vertical morphology. It is believed that the findings in this work will bring about more research interest and effort on eco-friendly processing in preparation for the industrial production of OSCs. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Toluene Processed All-Polymer Solar Cells with 18% Efficiency and Enhanced Stability Enabled by Solid Additive: Comparison Between Sequential-Processing and Blend-Casting

Author

Zhang, Guoping, Zhao, Chaoyue, Zhu, Liangxiang, Wang, Lihong, Xiong, Wenzhao, Hu, Huawei, Bai, Qing, Wang, Yaping, Xie, Chen, You, Peng, Yan, He, Wu, Dan, Yang, Tao, Qiu, Mingxia, Li, Shunpu, Zhang, Guangye, Zhang, Guoping, Zhao, Chaoyue, Zhu, Liangxiang, Wang, Lihong, Xiong, Wenzhao, Hu, Huawei, Bai, Qing, Wang, Yaping, Xie, Chen, You, Peng, Yan, He, Wu, Dan, Yang, Tao, Qiu, Mingxia, Li, Shunpu, and Zhang, Guangye

Abstract

The emergence of polymerized small molecule acceptors (PSMAs) has significantly improved the performance of all-polymer solar cells (all-PSCs). However, the pace of device engineering lacks behind that of materials development, so that a majority of the PSMAs have not fulfilled their potentials. Furthermore, most high-performance all-PSCs rely on the use of chloroform as the processing solvent. For instance, the recent high-performance PSMA, named PJ1-gamma, with high LUMO, and HOMO levels, could only achieve a PCE of 16.1% with a high-energy-level donor (JD40) using chloroform. Herein, we present a methodology combining sequential processing (SqP) with the addition of 0.5%wt PC71BM as a solid additive (SA) to achieve an impressive efficiency of 18.0% for all-PSCs processed from toluene, an aromatic hydrocarbon solvent. Compared to the conventional blend-casting (BC) method whose best efficiency (16.7%) could only be achieved using chloroform, the SqP method significantly boosted the device efficiency using toluene as the processing solvent. In addition, the donor we employ is the classic PM6 that has deeper energy levels than JD40, which provides low energy loss for the device. We compare the results with another PSMA (PYF-T-o) with the same method. Finally, an improved photostability of the SqP devices with the incorporation of SA is demonstrated.

Published
2023

32. 18.1% Ternary All-Polymer Solar Cells Sequentially Processed from Hydrocarbon Solvent with Enhanced Stability

Author

Zhao, Chaoyue, Ma, Ruijie, Hou, Yiwen, Zhu, Liangxiang, Zou, Xinhui, Xiong, Wenzhao, Hu, Huawei, Wang, Lihong, Yu, Han, Wang, Yajie, Zhang, Guoping, Yi, Jicheng, Chen, Lu, Wu, Dan, Yang, Tao, Li, Gang, Qiu, Mingxia, Yan, He, Li, Shunpu, Zhang, Guangye, Zhao, Chaoyue, Ma, Ruijie, Hou, Yiwen, Zhu, Liangxiang, Zou, Xinhui, Xiong, Wenzhao, Hu, Huawei, Wang, Lihong, Yu, Han, Wang, Yajie, Zhang, Guoping, Yi, Jicheng, Chen, Lu, Wu, Dan, Yang, Tao, Li, Gang, Qiu, Mingxia, Yan, He, Li, Shunpu, and Zhang, Guangye

Abstract

All-polymer solar cells (all-PSCs) have promising potential for industrial production due to their superior stability. Recently, the widespread application of the polymerized small molecule acceptor (PSMA) has led to a surge in the efficiency of all-PSCs. However, the high efficiencies of these devices generally rely on the use of the highly volatile solvent, chloroform (CF). Furthermore, the molecular weights of PSMA are lower than polymer donors, yet their crystallinity is weaker than typical small molecules, making most PSMA-based all-PSCs suffer from low electron mobility. To improve device performance and facilitate large scale production of all-PSCs, it is necessary to enhance electron mobility and avoid the use of CF. This paper investigates the use of sequential processing (SqP) for active layer preparation using toluene as the solvent to address these issues. This work reports 18.1% efficient all-PSC devices, which is the highest efficiency of all-PSCs prepared using non-halogen solvents. This work systematically compares the conventional blend-casting method with the SqP method using PM6 as the donor and PY-V-& gamma; and PJ1-& gamma; as the acceptors, and compares the performance of binary and ternary blends in both methods. Finally, this work measures the device stability and finds that SqP can significantly improve the photostability of the device.

Published
2023

33. MDACl2-Modified SnO2 Film for Efficient Planar Perovskite Solar Cells

Author

Xiao, Yaodong, primary, Cui, Xiangqian, additional, Xiang, Boyuan, additional, Chen, Yanping, additional, Zhao, Chaoyue, additional, Wang, Lihong, additional, Yang, Chuqun, additional, Zhang, Guangye, additional, Xie, Chen, additional, Han, Yulai, additional, Qiu, Mingxia, additional, Li, Shunpu, additional, and You, Peng, additional

Published
2023
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36. Efficient All-Polymer Solar Cells Enabled by Interface Engineering

Author

Zhang, Guoping, primary, Wang, Lihong, additional, Zhao, Chaoyue, additional, Wang, Yajie, additional, Hu, Ruiyu, additional, Che, Jiaxu, additional, He, Siying, additional, Chen, Wei, additional, Cao, Leifeng, additional, Luo, Zhenghui, additional, Qiu, Mingxia, additional, Li, Shunpu, additional, and Zhang, Guangye, additional

Published
2022
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38. Efficient All-Polymer Solar Cells with Sequentially Processed Active Layers

Author

Zhao, Chaoyue, Huang, Hui, Wang, Lihong, Zhang, Guoping, Lu, Guanyu, Yu, Han, Lu, Guanghao, Han, Yulai, Qiu, Mingxia, Li, Shunpu, Zhang, Guangye, Zhao, Chaoyue, Huang, Hui, Wang, Lihong, Zhang, Guoping, Lu, Guanyu, Yu, Han, Lu, Guanghao, Han, Yulai, Qiu, Mingxia, Li, Shunpu, and Zhang, Guangye

Abstract

In this work, we apply the sequential processing (SqP) method to address the relatively low electron mobility in recent all-polymer solar cells (all-PSCs) based on the polymerized small-molecule acceptor (PSMA). Compared to the blend-casting (BC) method, all-PSCs composed of PM6/PY-IT via the SqP method show boosted electron mobility and a more balanced charge carrier transport, which increases the FF of the SqP device and compensates for the short-circuit current loss, rendering comparable overall performance with the BC device. Through film-depth-dependent light absorption spectroscopy, we analyze the sub-layer absorption and exciton generation rate in the vertical direction of the device, and discuss the effect of the increased electron mobility on device performance, accordingly.

Published
2022

41. Turing patterns with high-resolution formed without chemical reaction in thin-film solution of organic semiconductors

Author

Li, Shunpu, Xiang, Zezhong, Li, Jin, You, Peng, han, Linbo, Qiu, Mingxia, Chen, Gengliang, He, Yu, Xiang, Boyuan, Su, Yaorong, and An, Hongyu

Abstract

Regular patterns can form spontaneously in chemical reaction-diffusion systems under non-equilibrium conditions as proposed by Alan Turing. Here, we found that regular patterns can be generated in uphill-diffusion solution systems without a chemical reaction process through both in-situ and ex-situ observations. Organic semiconductor solution is confined between two parallel plates with controlled micron/submicron-meter distance, to minimize convection of the liquid and avoid spinodal precipitation at equilibrium. The solvent evaporation concentrates the solution gradually into an oversaturated non-equilibrium condition, under which a phase-transition occurs and ordered concentration-waves are generated. By proper tuning of the experimental parameter, multiple regular patterns with micro/nano-meter scaled features (line, square-grid, zig-zag, and fence-like patterns etc.) were observed. We explain the observed phenomenon as Turing-pattern generation resulted from uphill-diffusion and solution oversaturation. The generated patterns in the solutions can be condensed onto substrates to form structured micro/nanomaterials. We have fabricated organic semiconductor devices with such patterned materials to demonstrate the potential applications. Our observation may serve as a milestone in the progress towards a fundamental understanding of pattern formation in nature, like in biosystem, and pave a new avenue in developing self-assembling techniques of micro/nano structured materials.

Published
2022
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42. Reduction of response time in transmissive optically addressed spatial light modulator (OASLM) using solution-based ZnO NP / PEDOT:PSS heterojunction

Author

Chang, Xin, Li, Jin, Shrestha, Pawan, Li, Shunpu, Surowiecka, Kasia, Chu, Daping, Shrestha, Pawan [0000-0002-2808-7043], Chu, Daping [0000-0001-9989-6238], and Apollo - University of Cambridge Repository

Subjects
PSS, heterojunction, holography, ZnO NP, PEDOT, OASLM
Abstract

Optically addressed spatial light modulator (OASLM) works by using the intensity of a 'write' light to modulate the phase of a 'read' light. OASLM using ZnO nanoparticles (NP) as photoconductor is important to holographic displays because of its record-high spatial resolution. However, its response time to the write light is long and the switch-off time (��off) can take tens of seconds due to the trap states in the ZnO NP layer. This results in residual images and poses limitations to its application in dynamic holographic displays. In this work, ZnO NP photoconductor was replaced by solution-processed ZnO NP / PEDOT:PSS heterojunction photodiode and the ��off of OASLM was significantly reduced to about 0.6 s. Electrical and optical properties of the heterojunction were characterized and a barrier height of 0.604 eV was determined by CV measurement. The heterojunction-based OASLM was then fabricated and its light modulating performance was investigated by using a diffractive phase grating. Finally, impedance spectroscopy was used to analysis the device equivalent circuit and optimize the operation of the OASLM.

Published
2022
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44. MDACl 2 -Modified SnO 2 Film for Efficient Planar Perovskite Solar Cells.

Author

Xiao, Yaodong, Cui, Xiangqian, Xiang, Boyuan, Chen, Yanping, Zhao, Chaoyue, Wang, Lihong, Yang, Chuqun, Zhang, Guangye, Xie, Chen, Han, Yulai, Qiu, Mingxia, Li, Shunpu, and You, Peng

Subjects
STANNIC oxide, SOLAR cells, PEROVSKITE, ELECTRON transport, ACTIVATION energy, PHOTOELECTRIC effect
Abstract

The electron transport layer (ETL) with excellent charge extraction and transport ability is one of the key components of high-performance perovskite solar cells (PSCs). SnO2 has been considered as a more promising ETL for the future commercialization of PSCs due to its excellent photoelectric properties and easy processing. Herein, we propose a facile and effective ETL modification strategy based on the incorporation of methylenediammonium dichloride (MDACl2) into the SnO2 precursor colloidal solution. The effects of MDACl2 incorporation on charge transport, defect passivation, perovskite crystallization, and PSC performance are systematically investigated. First, the surface defects of the SnO2 film are effectively passivated, resulting in the increased conductivity of the SnO2 film, which is conducive to electron extraction and transport. Second, the MDACl2 modification contributes to the formation of high-quality perovskite films with improved crystallinity and reduced defect density. Furthermore, a more suitable energy level alignment is achieved at the ETL/perovskite interface, which facilitates the charge transport due to the lower energy barrier. Consequently, the MDACl2-modified PSCs exhibit a champion efficiency of 22.30% compared with 19.62% of the control device, and the device stability is also significantly improved. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Spin‐Orbit Torque and Interfacial Dzyaloshinskii–Moriya Interaction in Heavy Metal/Ferrimagnetic Insulator Deposited by Magnetron Sputtering

Author

Ye, Zhixiang, primary, Chen, Zhiren, additional, Chen, Zehan, additional, Jia, Wei, additional, Gao, Tenghua, additional, Liu, Lin, additional, Zheng, Hongnan, additional, Zeng, Qi, additional, Wang, Qiuning, additional, Wang, Ning, additional, Xiang, Boyuan, additional, Lin, Tao, additional, Qiu, Mingxia, additional, Li, Shunpu, additional, Shi, Ji, additional, Hou, Zhipeng, additional, Ando, Kazuya, additional, and An, Hongyu, additional

Published
2021
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47. Spin–orbit torques in heavy metal/ferrimagnetic insulator bilayers near compensation

Author

Liu, Lin, primary, Fan, Ziqi, additional, Chen, Zhiren, additional, Chen, Zehan, additional, Ye, Zhixiang, additional, Zheng, Hongnan, additional, Zeng, Qi, additional, Jia, Wei, additional, Li, Shuoqi, additional, Wang, Ning, additional, Liu, Jing, additional, Ma, Lei, additional, Lin, Tao, additional, Qiu, Mingxia, additional, Li, Shunpu, additional, Han, Peigang, additional, Shi, Ji, additional, and An, Hongyu, additional

Published
2021
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49. Current-induced magnetization switching in a chemically disordered A1 CoPt single layer

Author

Chen, Zehan, primary, Liu, Lin, additional, Ye, Zhixiang, additional, Chen, Zhiren, additional, Zheng, Hongnan, additional, Jia, Wei, additional, Zeng, Qi, additional, Wang, Ning, additional, Xiang, Boyuan, additional, Lin, Tao, additional, Liu, Jing, additional, Qiu, Mingxia, additional, Li, Shunpu, additional, Shi, Ji, additional, Han, Peigang, additional, and An, Hongyu, additional

Published
2021
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