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High-efficiency organic solar cells enabled by an alcohol-washable solid additive

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Science China Chemistry 2021年第12期64卷 2161-2168页

作者： Yuanpeng Xie Hwa Sook Ryu Lili Han yunhao cai Xiaopeng Duan Donghui Wei Han Young Woo Yanming Sun School of Chemistry Beihang UniversityBeijing100191China Department of Chemistry College of ScienceKU-KIST Graduate School of Converging Science and TechnologyKorea UniversitySeoul136-713Korea College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou450001China

The solvent additive strategy has been widely utilized to boost the power conversion efficiency(PCE)of organic solar cells(OSCs).However,the residual solvent additive in the active layer tends to induce a gradual morphology degradation and further influences the long-term stability of ***,a solid additive,1,4-diiodobenzene(DIB),was introduced to fabricate efficient *** found that the treatment of DIB can lead to optimized morphology to form a bicontinuous network with intensified intermolecular packing in the donor and acceptor ***,DIB can be easily removed from the active layer via a simple alcohol washing process and no further post-thermal annealing is needed,which is desirable for large-scale manufacturing of *** a result,high efficiencies of 17.47%for PM6:Y6 and 18.13%(certified as 17.7%)for PM6:BTP-eC9 binary OSCs are achieved,which are among the highest efficiencies reported for binary OSCs thus ***,OSCs fabricated with DIB also exhibit superior stability compared with the as-cast and traditional solvent additive processed ***,DIB was successfully applied in different active layers,manifesting its general *** work provides a feasible approach to enhance both the efficiency and stability of OSCs.

关键词： organic solar cells solid additive alcohol washing process efficiency stability

Heteroatom substitution-induced asymmetric A–D–A type non-fullerene acceptor for efficient organic solar cells

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Journal of Energy Chemistry 2020年第1期29卷 144-150,I0006页

作者： Chao Lia Jiali Song yunhao cai Guangchao Han Wenyu Zheng Yuanping Yi Hwa Sook Ryu Han Young Woo Yanming Sun School of Chemistry Beihang UniversityBeijing 100191China Beijing National Laboratory for Molecular Science Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Department of Chemistry College of ScienceKorea UniversitySeoul 136-713Republic of Korea

Research on asymmetric A–D–A structured non-fullerene acceptors has lagged far behind the development of symmetric *** this contribution,by simply replacing one sulfur atom in indacenodithiophene unit with a selenium atom,an asymmetric building block Se PT and a corresponding asymmetric non-fullerene acceptor Se PT-IN have been *** Se PT-IN achieved a high efficiency of 10.20% in organic solar cells when blended with PBT1-C,much higher than that of symmetric TPT-IN counterpart(8.91%).Our results demonstrated an effective heteroatom substitution strategy to develop asymmetric A–D–A structured non-fullerene acceptors.

关键词： Asymmetric non-fullerene acceptors Heteroatom substitution Organic solar cells Power conversion efficiency

Enhancing Photovoltaic Performance of Nonfused-Ring Electron Acceptors via Asymmetric End-Group Engineering and Noncovalently Conformational Locks

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Chinese Journal of Chemistry 2024年第5期42卷 485-490页

作者： Bo Liu Congqi Li Xiaobin Gu Yinghui Han Zhixiang Wei yunhao cai Xin Zhang Hui Huang Yanping Huo School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhouGuangdong510006 China College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of SciencesBeijing100049 China College Resources and Environment University of Chinese Academy of SciencesBeijing100049 China Center for Excellence in Nanoscience (CAS) & Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and TechnologyBeijing100190 China

By employing the asymmetric end-group engineering,an asymmetric nonfused-ring electron acceptor(NFREA)was designed and *** with the symmetric analogs(NoCA-17 and NoCA-18),NoCA-19 possesses broader light absorption range,more coplanarπ-conjugated backbone,and appropriate crystallinity according to the experimental and theoretical *** organic solar cells based on J52:NoCA-19 exhibited a power conversion efficiency as high as 12.26%,which is much higher than those of J52:NoCA-17(9.50%)and J52:NoCA-18(11.77%),mainly due to more efficient exciton dissociation,better and balanced charge mobility,suppressed recombination loss,shorter charge extraction time,longer charge carrier lifetimes,and more favorable blend film *** findings demonstrate the great potential of asymmetric end-group engineering in exploring low-cost and high-performance NFREAs.

关键词： Organic solar cells Nonfused-ring electron acceptors Asymmetric end-group engineering Noncovalently conformational locks Low-cost acceptors

Organic solar cells based on chlorine functionalized benzo[1,2-b:4,5-b′]difuran-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione copolymer with efficiency exceeding 13%

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Science China Chemistry 2020年第4期63卷 483-489页

作者： Linglong Ye Xueshan Li yunhao cai Hwa Sook Ryu Guangkai Lu Donghui Wei Xiaobo Sun Han Young Woo Songting Tan Yanming Sun School of Chemistry Beihang UniversityBeijing 100191China Department of Chemistry College of ScienceKorea UniversityAnam-ro 145Seongbuk-guSeoul 136-713Republic of Korea The College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education College of ChemistryXiangtan UniversityXiangtan 411105China

Benzo[1,2-b:4,5-b′]dithiophene(BDT) has been widely used to construct donor-acceptor(D-A) copolymers in organic solar cells(OSCs). However, benzo[1,2-b:4,5-b′]difuran(BDF), an analogue of BDT, has received less attention than BDT. The photovoltaic performance of BDF copolymers has lagged behind that of BDT copolymers. Here, we designed and synthesized two BDF copolymers, PBF1-C and PBF1-C-2Cl. PBF1-C-2Cl, which is composed of BDF and benzo[1,2-c:4,5-c′]dithiophene-4,8-dione connected by a chlorinated thiophene π-bridge, displays a low-lying highest occupied molecular orbital energy level,which helps in yielding a high open-circuit voltage(Voc) in OSCs. As a result, when blended with Y6, PBF1-C-2Cl-based devices showed a high Voc of 0.83 V and a power conversion efficiency(PCE) of 13.10%. To the best of our knowledge, the PCE of 13.10% is among the highest efficiency values for OSCs based on BDF copolymers.

关键词： organic solar cells benzo[1,2-b,5-b′]difuran benzo[1,2-c,5-c′]dithiophene-4,8-dione chlorinated thiophene π-bridge

Combination of S…N and S…Cl Noncovalently Conformational Locks for Constructing High-Planarity and Low-Cost Nonfused-Ring Electron Acceptors

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Chinese Journal of Chemistry 2023年第15期41卷 1797-1802页

作者： Ziyang Han Congqi Li Xiaobin Gu Xiao Han Sixuan Wang Yanan Wei Jinhua Gao Zhixiang Wei yunhao cai Xin Zhang Hui Huang College of Materials Science and Opto-Electronic Technology&Center of Materials Science and Optoelectronics Engineering&CAS Center for Excellence in Topological Quantum Computation&CAS Key Laboratory of Vacuum Physics University of Chinese Academy of SciencesBeijing 100049China Center for Excellence in Nanoscience(CAS)&Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS) National Center for Nanoscience and TechnologyBeijing 100190China

Comprehensive Summary By employing thiazole and 4-chlorothiazole as the A′units,two A-D-A′-D-A type nonfused-ring electron acceptors(NFREAs)Tz-H and Tz-Cl were designed and *** thiazole in Tz-H with 4-chlorothiazole can not only remarkably shorten the synthetic route through C—H direct arylation but also enhance molecular planarity with the simultaneous incorporation of S…N and S…Cl noncovalently conformational locks(NoCLs).The photovoltaic devices based on PM6:Tz-Cl exhibited a power conversion efficiency as high as 11.10%,much higher than that of PM6:Tz-H(6.41%),mainly due to more efficient exciton dissociation,better and more balanced carrier mobility,less charge recombination,and more favorable *** findings demonstrate the great potential of NoCLs in achieving low-cost and high-performance NFREAs.

关键词： Organic solar cells Nonfused-ring electron acceptors Noncovalently conformational locks High-planarity and low-cost acceptors 4-Chlorothiazole

Improvement of photovoltaic properties of benzo[1,2-b:4,5-b′]difuran-conjugated polymer by side-chain modification

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ChemPhysMater 2023年第3期2卷 225-230页

作者： Yun Li Guangkai Lu Linglong Ye Hwa Sook Ryu yunhao cai Han Young Woo Yan Li Yanming Sun School of Chemistry Beihang UniversityBeijing 100191China Department of Chemistry College of ScienceKorea UniversitySeoul 136-713Republic of Korea

The development of polymer solar cells(PSCs)for the donor materials based on benzo[1,2-b:4,5-b′]dithiophene(BDT)has significantly boosted the power conversion efficiency(PCE).However,the PCE of polymer donor materials for benzo[1,2-b:4,5-b′]difuran(BDF)-based lags far behind that of their BDT *** further explore efficient copolymers based on BDF units,a two-dimensional(2D)side-chain strategy was proposed to investigate the atom-changing effects on the copolymer donors for the properties of electron and *** this study,we designed and synthesized three new BDF-based copolymer donor materials,named PBDF-C,PBDF-O,and *** to the balanced charge transport and favorable phase separation of PBDF-S:Y6,a high PCE of 13.4%,a short-circuit current(J sc)of 25.48 mA cm−2,an open-circuit voltage(V oc)of 0.721 V,and a fill factor(FF)of 72.6%was *** research demonstrates that the BDF building block has great potential for constructing conjugated copolymer donors for high-performance PSCs and that 2D side-chain modification is a facile approach for designing high-performance BDF-based copolymer materials.

关键词： Polymer solar cells Benzodifuran Side-chain modification Polymer donor Efficiency

Insight into the efficiency-stability-cost balanced organic solar cell based on a polymerized nonfused-ring electron acceptor

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Aggregate 2023年第6期4卷 172-179页

作者： Xiaobin Gu Yanan Wei Guanyu Lu Ziyang Han Di Zheng Guanghao Lu Jianqi Zhang Zhixiang Wei yunhao cai Xin Zhang Hui Huang College of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics EngineeringCAS Center for Excellence in Topological Quantum ComputationCAS Key Laboratory of Vacuum PhysicsUniversity of Chinese Academy of SciencesBeijingChina Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’anChina CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina

Organic solar cells(OSCs)have attracted extensive attention from both academia and industry in recent years due to their remarkable improvement in power conversion efficiency(PCE).However,the Golden Triangle(the balance of efficiency-stability-cost)required for large-scale industrialization of OSCs still remains a great ***,a new nonfused-ring electron acceptor(NFREA)BF and its polymerized counterpart PBF were designed and synthesized,and their photovoltaic performance,storage stability and material cost were systematically *** blended with a widely-used polymer donor PBDB-T,the PBFbased all-polymer solar cell(all-PSC)displayed a record high PCE of 12.61%for polymerized NFREAs(PNFREAs)with an excellent stability(95.2%of initial PCE after 800 h storage),superior to the BF ***,PBF-based allPSC possesses the highest industrial figure-of-merit(i-FOM)value of 0.309 based on an efficiency-stability-cost evaluation,in comparison to several representative OSC systems(such as PM6:Y6 and PBDB-T:PZ1).This work provides an insight into the balance of efficiency,stability,and cost,and also indicates that the PNFREAs are promising materials toward the commercial application of OSCs.

关键词： all-polymer solar cells efﬁciency-stability-cost balance noncovalently conformational locks organic solar cell polymerized nonfused-ring electron acceptors

High-Efficiency and Low-Energy-Loss Organic Solar Cells Enabled by Tuning Conformations of Dimeric Electron Acceptors

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CCS Chemistry 2023年第11期5卷 2576-2588页

作者： Xiaobin Gu Yanan Wei Na Yu Jiawei Qiao Ziyang Han Qijie Lin Xiao Han Jinhua Gao Congqi Li Jianqi Zhang Xiaotao Hao Zhixiang Wei Zheng Tang yunhao cai Xin Zhang Hui Huang College of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics EngineeringCAS Center for Excellence in Topological Quantum ComputationCAS Key Laboratory of Vacuum PhysicsUniversity of Chinese Academy of SciencesBeijing 100049 Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620 School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100 Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190

Dimeric fused-ring electron acceptors(DFREAs)have attracted much attention due to the combined advantages of their monomeric and polymeric acceptors,including a well-defined molecular structure,excellent repeatability,and stable ***,the additionally introduced single-bonds during dimerization may result in a twisted backbone of DFREAs,which is detrimental to intermolecular packing and charge ***,three DFREAs are designed and synthesized,in which DFREA conformations were systematically tuned via adjusting the intensities of intramolecular noncovalent interactions(INIs)to achieve high-performance organic solar cells(OSCs).Theoretical and experimental results show that the gradual introduction of S…F INIs can continuously improve molecular planarity and rigidity,resulting in reduced reorganization energies,ordered packing mode,and enhanced crystallization of *** from the incorporation of fourfold S…F INIs,DYF-TF-based binary OSCs show a record high efficiency of 18.26%with an extremely low energy loss(0.493 eV)for DFREAbased *** addition,DYF-TF-based OSCs exhibited good long-term stability with a T_(80%)lifetime of 2681 h,and the power conversion efficiency of the DYF-TF-based ternary device is further enhanced to 18.73%.This contribution demonstrates the great potential of the INIs strategy in achieving excellent DFREAs materials.

关键词： organic solar cells dimeric fused-ring electron acceptors intramolecular noncovalent interactions molecular planarity and rigidity reorganization energies

基于IPSO-LMMSE算法的信道估计仿真与实现

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现代电子技术 2023年第23期46卷 23-27页

作者：蔡云浩刘祖深许虎中北大学山西太原030051 中电科思仪科技(安徽)有限公司安徽蚌埠233010 电子测量仪器技术蚌埠市技术创新中心安徽蚌埠233010

WiFi7作为一种新型的高速无线局域网技术,被广泛应用于各种移动设备中。在WiFi系统中,信道会受到各种影响,例如时变和多路径传播频率选择性衰落、信号衰减、反射和强噪声干扰效应,这些影响会显著降低系统性能。因此,信道估计成为重要环... 详细信息

WiFi7作为一种新型的高速无线局域网技术,被广泛应用于各种移动设备中。在WiFi系统中,信道会受到各种影响,例如时变和多路径传播频率选择性衰落、信号衰减、反射和强噪声干扰效应,这些影响会显著降低系统性能。因此,信道估计成为重要环节,其结果直接影响到系统的性能和可靠性。文中提出改进的粒子群优化(IPSO)算法,通过改变传统PSO算法惯性权重的计算方式,与线性最小均方误差算法(LMMSE)结合使用。实验结果表明,在信噪比相同的条件下,改进后算法的MSE、BER、EVM等指标相较于传统LMMSE算法有显著提升,并且该方法应用于国产矢量信号分析软件VSA中,具有较好的实用性和应用前景。

关键词： WiFi7 信道估计粒子群优化 IPSO LMMSE 信号分析