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Improved efficiency and photo-stability of methylamine-free perovskite solar cells via cadmium doping

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Journal of Semiconductors 2019年第12期40卷 87-91页

作者： Yong Chen Yang Zhao Qiufeng Ye Zema Chu Zhigang Yin Xingwang Zhang Jingbi You Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Although perovskite solar cells containing methylamine cation can show high power conversion efficiency,stability is a ***,methylamine-free perovskite material Csx FA1–x PbI3 was synthesized by a one-step *** addition,we incorporated smaller cadmium ions into mixed perovskite lattice to partially replace Pb ions to address the excessive internal strain in perovskite *** have found that the introduction of Cd can improve the crystallinity and the charge carrier lifetime of perovskite ***,a power conversion efficiency as high as 20.59%was *** importantly,the devices retained 94%of their initial efficiency under 1200 h of continuous illumination.

关键词： methylamine-free photo-stability lattice strain cadmium doping

Synthesis,optical properties and self-organization of blue-emitting butterfly-shaped dithienobenzosiloles

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Chinese Chemical Letters 2022年第9期33卷 4306-4312页

作者： Gaozhang Gou Zhaoling Zhang Tao Fan Lei Fang Mingxian Liu Liangchun Li Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and EngineeringTongji UniversityShanghai 200092China

Ten novel butterfly-shaped dithienobenzosilole-based luminogens,which are peripherally installed with a variety of substituents including hydrogen,phenyl and substituted phenyl groups,have been readily prepared via an iodine-induced intramolecular electrophilic double-cyclisation reaction and subsequent deiodination or coupling *** optical and electrochemical properties of these compounds were systematically investigated to clarify the relationships between their structures and properties,supported by theoretical *** compounds exhibit deep-blue to sky-blue emissions and high photoluminescence quantum yields up to 0.84 in solution and solid states which are regulated by the functional blades and their steric hindrance on theα–andβ–positions of thiophene *** high thermal-and photo-stabilities have been revealed and mainly attributed to the dithienobenzosilole core.

关键词： Dithienobenzosilole Luminogen Double-cyclisation Blue-emitting photo-stability

photostable lysosomal imaging of living cell with hyperspectral stimulated Raman scattering microscopy using a probe based on bisarylbutadiyne

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Chinese Chemical Letters 2019年第7期30卷 1393-1396页

作者： Cong Ding Yage Chen Haozheng Li Bingyao Wang Qi Wei Huajun Tang Shaokang Jia Zhiyong He Ping Wang Xiang Zhou College of Chemistry and Molecular Sciences Key Laboratory of Biomedical Polymers of the Ministry of Education WuhanUniversity Wuhan 430072 China Britton Chance Center for Biomedical photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China MoE Key Laboratory for Biomedical photonics Collaborative Innovation Center for Biomedical Engineering School of Engineering Sciences Huazhong University of Science and Technology Wuhan 430074 China

We designed a lysosome-selective Raman probe by conjugating bisphenylbutadiyne with morpholine, a well-known lysosome targeting moiety. This probe, named Lyso-BADY, has a Raman peak 28 times more intense than that of 5-ethynyl-2'-deoxyuridine. Lysosome in living cells was successfully visualized by hyperspectral stimulated Raman scattering (SRS) microscopy with this extracellular probe. Further study showed that the Raman signal of Lyso-BADY remained steady and strong even after a prolonged irradiation time. The photo-stability feature of Lyso-BADY rendered molecules of the similar structure as potentially versatile probe for continuous imaging in the future.

关键词： Raman probe SRS Cell imaging photo-stability feature

Intrinsically inert hyperbranched interlayer for enhanced stability of organic solar cells

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Science Bulletin 2022年第2期67卷 171-177,M0004页

作者： Yawen Li Tengfei Li Jiayu Wang Xiaowei Zhan Yuze Lin Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Device stability becomes one of the most crucial issues for the commercialization of organic solar cells(OSCs) after high power conversion efficiencies have been achieved. Besides the intrinsic stability of photoactive materials, the chemical/catalytic reaction between interfacial materials and photoactive materials is another critical factor that determines the stability of OSC devices. Herein, we design and synthesize a reaction-inert rylene diimide-embedded hyperbranched polymer named as PDIEIE, which effectively reduces the work function of indium tin oxide electrode from 4.62 to 3.65 eV. Meanwhile, PDIEIE shows negligible chemical reaction with high-performance photoactive materials and no catalytic effect under strong ultraviolet illumination, resulting in much better photo-stability of OSCs with PDIEIE cathode interlayer(CIL), relative to the traditional CILs, including most-widely used metal oxides and polyethyleneimine derivatives.

关键词： photo-stability Work function Cathode interlayer Hyperbranched polymer Organic solar cell

Tailoring electrical property of the low-temperature processed SnO_2 for high-performance perovskite solar cells

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Science China Materials 2019年第2期62卷 173-180页

作者： Jing Liu Nan Li Qingshun Dong Jiangwei Li Chao Qin Liduo Wang Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University Key Laboratory of Polyoxometalate Science of Ministry of Education Department of Chemistry Northeast Normal University

Herein, we for the first time doped Nb^5+into the low-temperature(<100°C) SnO2sol-gel route to tailor the electrical property of SnO2 layers and the band alignment between SnO2 and the normally used mixed perovskites. The results revealed that proper Nb5+doping increased the conductivity of the SnO2 electron transport layer(ETL), and the conduction band(CB) level of the SnO2 ETL was shifted down to approach the CB level of perovskites, which facilitated the electron injection from perovskite to SnO2, accelerated the charge transport, and reduced the non-radiative recombination, leading to improved power conversion efficiency from18.06% to 19.38%. The Nb^5+doping process provided an efficient route for fabricating high-efficiency perovskite solar cells(PSCs) at a temperature lower than 100°C, and promoted the commercialization progress of PSCs.

关键词： SnO2 niobium doping band alignment perovskite solar cells photo-stability

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PVC材料光稳定性机理研究

PVC材料光稳定性机理研究