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Near-infrared non-fused electron acceptors for efficient organic photovoltaics

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Chinese Chemical Letters 2024年第4期35卷 436-441页

作者： Wenxiang Ma Xinyu He Tianyi Chen De-li Ma Hongzheng Chen chang-zhi li State Key Laboratory of Silicon and Advanced Semiconductor Materials Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Developing narrow-bandgap organic semiconductors is important to facilitate the advancement of organic photovoltaics(OPVs). Herein, two near-infrared non-fused ring acceptors(NIR NFRAs), PTBFTT-F and PTBFTT-Cl have been developed with A-π_A-π_D-D-π_D-π_A-A non-fused structures. It is revealed that the introduction of electron deficient π-bridge(π_A) and multiple intramolecular noncovalent interactions effectively retained the structural planarity and intramolecular charge transfer of NFRAs, extending strong NIR photon absorption up to 950 nm. Further, the chlorinated acceptor, with the enlarged π-surface compared to the fluorinated counterpart, promoted not only molecular stacking in solid, but also the desirable photochemical stability in ambient, which are helpful to thereby improve the exciton and charge dynamics for the corresponding OPVs. Overall, this work provides valuable insights into the design of NIR organic semiconductors.

关键词： Organic photovoltaic Near-infrared Non-fused electron acceptor Noncovalent interaction Stability

Multifunctional semitransparent organic solar cells with excellent infrared photon rejection

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Chinese Chemical Letters 2020年第6期31卷 1608-1611页

作者： Xue li Ruoxi Xia Kangrong Yan Hin-Lap Yip Hongzheng Chen chang-zhi li State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Luminescent Materials and Devices School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

Semitransparent organic solar cells(ST-OSCs)have the potentials to open promising applications that differ from those of conventional inorganic ones,such as see-through power windows with both energy generation and heat insulation ***,to achieve so,there remain significant challenges,especially for balancing critical parameters,such as power conversion efficiency(PCE),average visible transparency(AVT)and low energy infrared photon radiation rejection(IRR)to realize the full potentials of ***,we demonstrate the new design of ST-OSCs through the rational integration of organic materials,transparent electrode and infrared photon reflector in one *** the assistance of optical simulation,new ST-OSCs with precise layout exhibit state-of-art performance,with near 30%AVT and PCE of 7.3%,as well as an excellent IRR of over 93%(780-2500 nm),representing one of best multifunctional ST-OSCs with promising perspective for window application.

关键词： Semitransparent organic solar cell Distributed Bragg reflector Ultrathin silver film Infrared radiation rejection Average visible transparency

High-efficiency organic solar cells with low voltage-loss of 0.46 V

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Chinese Chemical Letters 2020年第7期31卷 1991-1996页

作者： zhi-Peng Yu Xue li Chengliang He Di Wang Ran Qin Guanqing Zhou zhi-Xi liu Thomas Rieks Andersen Haiming Zhu Hongzheng Chen chang-zhi li MOE Key Laboratory of Macromolecular Synthesis and Functionalization State Key Laboratory of Silicon MaterialsDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Chemistry Zhejiang UniversityHangzhou 310027China

The recent evolution of active components yielded brilliant progresses for organic solar cells(OSCs),yet the mechanism is needed to be clearly *** this wo rk,two electron acceptors,a linear SN6-2Br and a V-shaped BTP-2Br,are developed with nitrogen atoms introduced to replace the traditional sp3-hybridized carbon in the fused ***-2Br possesses an electron-de ficient central core,which exhibits slightly blue-shifted absorption as well as deepened HOMO-level compared with *** corresponding photovoltaic performance from V-shaped BTP-2Br based devices exhibit superior performance especially in short-circuit current(Jsc),despite an enhanced absorption and charge carrier mobilities for *** primary reason for the higher JSC from BTP-2Br is faster exciton diffusion and dissociation in ble nds,than those of *** a result,PBDB-TF:BTP-2Br based devices achieve a power conversion efficiency(PCE)of 13.84%with an voltage-loss of only 0.46 V,which is one of the lowest values ever ***,we fabricated semitransparent OSCs that exhibit an excellent PCE of 9.62%with average visible transparency of 20.1%.

关键词： Organic solar cells High efficiency Low voltage-loss Semitransparent OSCs Electron-defficient central core

Analysis of Vitamin K_3 by a Fluorescent Spectroelectrochemistry Method

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Chemical Research in Chinese Universities 2010年第5期26卷 742-745页

作者： ZHAO chang-zhi li Ying DU Hong XU Hua-jun JIAO Kui Key Laboratory of Eeo-Chemical Engineering Ministry of Education College of Chemistry ＆ Molecular Engineering Qingdao University of Science ＆ Technology Qingdao 266042 P. R. China

A simple and sensitive spectroelectrochemistry method for the determination of vitamin K3 was developed by combining electrolysis and fluoremetry. This method was based on that vitamin K3 was reduced at a glassy carbon electrode, and its product with characteristic fluorescence at 420 nm was determined with excitation wavelength at 309 nm. Under optimized electrochemical reaction conditions and fluorescent experiment parameters, the fluorescence intensity was proportional to the concentration of vitamin K3 in a range from 3.50×10^-7 to 1.05×10^-5 mol/L with a correlation coefficient of 0.9991, and detection limit was estimated to be 7.50× 10^-8 mol/L at a signal/noise ra- tio of 3. The relative standard deviation was less than 4.3%（n=5） and the recovery was in a range of 97%-105% for the determination of vitamin K3 in pharmaceutical preparations. The result is satisfactory for the determination of vitamin K3 as comparison to that from HPLC method.

关键词： Spectroelectrochemistry Fluorescence Electro-reduced Vitamin K3

Curing the vulnerable heterointerface via organic-inorganic hybrid hole transporting bilayers for efficient inverted perovskite solar cells

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Chinese Chemical Letters 2024年第6期35卷 254-257页

作者： Kangrong Yan Ziqiu Shen Yanchun Huang Benfang Niu Hongzheng Chen chang-zhi li State Key Laboratory of Silicon and Advanced Semiconductor Materials Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

To promote the practices of perovskite photovoltaics,it requires to develop efficient perovskite solar cells(PVSCs)standing long-time operation under the adverse ***,we demonstrate that the tailor-made conjugated polymers as conductive adhesives stabilized the originally redox-reactive heterointerface between perovskite and metal oxide,facilitating the access of efficient and stable inverted *** was revealed that bithiophene and phenyl alternating conjugated polymers with partial glycol chains atop of the metal oxide layer has resulted in effective organic-inorganic hybrid hole transporting bilayers,which allow maintaining efficient hole extraction and transport,meanwhile preventing halide migration to directly contact with the nickel oxide(NiO_(x))*** a result,the corresponding inverted PVSCs with the organic-inorganic hole transporting bilayers have achieved an excellent power conversion efficiency of 23.22%,outperforming 20.65% of bare NiO_(x)-based ***,the encapsulated PVSCs with organic-inorganic bilayers exhibited the excellent photostability with 91% of the initial efficiency after 1000-h one-sun equivalent illumination in ambient ***,this work provides new insights into stabilizing the vulnerable heterointerface for perovskite solar cells.

关键词： Perovskite solar cells Conjugated polymer Hole transporting bilayer Charge extraction Heterointerface degradation

Influence of Edge Rolling Reduction on Plate-Edge Stress Distribution During Finish Rolling

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Journal of Iron and Steel Research International 2009年第1期16卷 22-26页

作者： YU Hai-liang liU Xiang-hua CHEN li-qing li chang-sheng zhi Ying li Xin-wen The State Key Laboratory of Roiling and Automation Northeastern University Shenyang 110004 Liaoning China

Dimensions of one kind of stainless steel plate before finish rolling were obtained through analysis of the rough rolling processes by finite element method and updated geometrical method. The FE models of finish rolling process with a front edge roll were built, and influences of the edge rolling reduction on the stress change in the plate edge during finish rolling were analyzed. The results show that when the edge rolling reduction is increased from 0 mm to 2 mm, the compressive stress in plate corner clearly increases in edge rolling process, and the zone of tensile stress during whole rolling decreases; when the edge rolling reduction is increased from 2 mm to 5 ram, the compressive stress in the plate corner seldom changes, and the compressive stress decreases after the horizontal rolling.

关键词： edge rolling reduction stress FEM finish rolling

Non-fused medium bandgap electron acceptors for efficient organic photovoltaics

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Journal of Energy Chemistry 2022年第7期31卷 576-582,I0014页

作者： Tian-Jiao Wen Jiale Xiang Nakul Jain zhi-Xi liu Zeng Chen Xinxin Xia Xinhui Lu Haiming Zhu Feng Gao chang-zhi li State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina Department of Physics Chemistry and Biology(IFM) Link?ping UniversityLinköping SE-58183Sweden Department of Chemistry Zhejiang UniversityHangzhou 310027ZhejiangChina Department of Physics The Chinese University of Hong KongNew TerritoriesHong Kong 999077China

The cost-effective organic semiconductors are strongly needed in organic photovoltaics(OPVs). Herein,two medium bandgap(MBG) electron acceptors, TPT4F and TPT4Cl are developed via the new design of multi-noncovalent interaction assisted unfused core, flanked with two electron withdrawing end groups. These fullly non-fused MBG acceptors adapt the planar and rigid conformation in solid, therefore exhibiting the ordered face-on stacking and strong photoluminescence in films. As results, TPT4Cl^(-)based OPVs, upon blending with the PBDB-TF polymer donor, have achieved a power conversion efficiency of 10.16% with a low non-radiative loss of 0.27 e V, representing one of the best fullly non-fused medium bandgap acceptors with desirable cost-efficiency balance.

关键词： Organic photovoltaic Medium bandgap Electron withdrawing unit Non-covalent interaction

Columnar to Equiaxed Transition During Solidification of Small Ingot by Using Electric Current Pulse

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Journal of Iron and Steel Research International 2009年第6期16卷 7-12页

作者： li Jie MA Jian-hong SONG chang-jiang li zhi-jun GAO Yu-lai ZHAI Qi-jie Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China

A new approach to applying the electric current pulse （ECP） with parallel electrodes to the promotion of the transition from columnar crystal to equiaxed crystal and the improvement of macrosegregation was introduced. The ECP was applied to different stages of the solidification. The results showed that the application of the ECP in both the initial stage （the thickness of solidified shell reached 2 mm approximately） and the late stage （the thickness of solidified shell reached 14 mm approximately） of solidification can promote the columnar to equiaxed transition （CET）. The analysis showed that during solidification, a large number of nuclei around the upper surface fell off due to ECP, which subsequently showered on the melt and impinged the growth front of the columnar crystal. Therefore, the CEToccurred. In addition, this method was also employed to influence the solidification process of bearing steel, and the results showed that the structure was changed from columnar crystal to equiaxed crystal, indicating that ECP can enhance the homogeneity of structure and composition of bearing steel.

关键词： columnar to equiaxed transition solidification electric current pulse macrosegregation

Unaxisymmetric Non-Fused Electron Acceptors for Efficient Polymer Solar Cells

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Chinese Journal of Polymer Science 2022年第8期40卷 944-950,I0009页

作者： Si-Ya liu Di Wang Tian-Jiao Wen Guan-Qing Zhou Hai-Ming Zhu Hong-Zheng Chen chang-zhi li State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou310027China Department of Chemistry Zhejiang UniversityHangzhou310027China

To develop photovoltaics embracing the both features of high performance and low cost has drawn attentions of researchers,yet representing the significant *** this work,two non-fused ring acceptors(NFRAs),namely p-PTIC4Cl and t-PTIC4Cl,were developed via a short synthetic *** tethering unaxisymmetric aromatic chains to thienyl bridge of NFRAs,we revealed that the tuning of aromatic chains allows modulating the self-assembly and stacking of NFRAs in solid,hence influencing their optoelectronic and photovoltaic *** results,p-PTIC4Cl,consisting of 3-hexylbenzene with large axial angle to backbone,can achieve superior PCE of 11.30%than that of t-PTIC4Cl with 2-hexylthiophene chains(PCE of 6.49%),when pairing with polymer donor *** of the only subtle structural difference,the p-PTIC4Cl based blend films possess better exciton dissociation and charge transfer rates,as well as photostability,to those of t-PTIC4Cl based blends.

关键词： Polymer solar cells Non-fused ring acceptor Unaxisymmetric aromatic chains Photostability