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Chinese Journal of Polymer Science 2017年第9期35卷 1073-1085页

作者： Ansuman Nayak P.S. Rama Sreekanth Santosh Kumar Sahu Duryodhan Sahu Department of Chemistry National Institute of Science and Technology Palur Hills Berhampur Odisha India 761008 Department of Chemistry Gandhi Institute of Engineering and Technology Gunpur Odisha India Department of Mechanical Engineering National Institute of Science and Technology Palur Hills Berhampur Odisha India 761008

A series of novel low band gap donor-acceptor （D-A） type organic co-polymers （BT-F-TPA, BT-CZ-TPA and BT-SI-TPA） consisting of electron-deficient acceptor blocks both in main chains （M1） and at the pendant （M2） were polymerized with different electron rich donor （M3-M5） blocks, i.e., 9,9-dihexyl-9H-fluorene, N-alkyl-2,7-carbazole, and 2,6-dithinosilole, respectively, via Suzuki method. These polymers exhibited relatively low band gaps （1.65-1.88 eV） and broad absorption ranges （680-740 nm）. Bulk heterojunction （BHJ） solar cells incorporating these polymers as electron donors, blended with [6,6]-phenyl-C61-butyric acid methyl ester （PC61BM） or [6,6]-phenyl-Cvl-butyric acid methyl ester （PC71BM） as electron-acceptors in different weight ratios were fabricated and tested under 100 mW/cm2 of AM 1.5 with white-light illumination. The photovoltaic device containing donor BT-SI-TPA and acceptor PC71BM in 1：2 weight ratio showed the best power conversion efficiency （PCE） value of 1.88%, with open circuit voltage （Voc） = 0.75 V, short circuit current density （Jsc） = 7.60 mA/cm2, and fill factor （FF） = 33.0%.

关键词： Polymer solar cells low band gap Conducting polymers Charge transfer Donor-acceptor Bulk heterojunctionsolar cell

Thienopyrazine or Dithiadiazatrindene Containing low band gap Conjugated Polymers for Polymer Solar Cells

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Chinese Journal of Polymer Science 2014年第7期32卷 844-853页

作者： Mukhamed L.Keshtov Dmitry V.Marochkin Ying-ying Fu Zhi-yuan Xie 耿延候 Vitaly S.Kochurov Alexei R.Khokhlov A.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences Lomonosov Moscow State University Faculty of Physics 119991

Four new low-band-gap alternating copolymers （P-1, P-2, P-3 and P-4） based on electron-rich benzodithiophene and newly developed electron-deficient units, thienopyrazine or dithiadiazatrindene derivatives, were synthesized by Stille polycondensation. All polymers exhibit good solubility in common organic solvents and a broad absorption band in the visible to near-infrared regions. The film optical band gaps of the polymers are in the range of 1.28-2.07 eV and the highest occupied molecular orbital （HOMO） energy levels are in the range of-4.99 eV to -5.28 eV. Bulk heterojunction polymer solar cells （PSCs） of the polymers were fabricated with phenyl-C61-butyric acid methyl ester （PC61BM） as acceptor material, and a power conversion efficiency of 0.80% was realized with P-1 as donor material.

关键词： low band gap Conjugated polymers Electron-deficient aromatics Polymer solar cells.

Dithienopyrrole Based Small Molecule with low band gap for Organic Solar Cells

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Chinese Journal of Chemistry 2015年第8期33卷 852-858页

作者： Miaomiao Li Wang Ni Huanran Feng Bin Kan Xiangjian Wan Yamin Zhang Xuan Yang Yongsheng Chen Key Laboratory for Functional Polymer Materials Centre for Nanoscale Science and TechnologyInstitute of Polymer Chemistry Collaborative Innovation of Chemical Science and Engineering ( Tianjin) College of Chemistry Nankai University Tianjin 300071 China

A low band gap acceptor-donor-acceptor （A-D-A） small molecule donor material, named DR3TDTN, has been designed and synthesized for solution-processed organic solar cells. DR3TDTN shows narrow optical band gap with value of 1.49 eV and broad absorption spectrum from 300 to 820 rim. The HOMO and LUMO energy levels of DR3TDTN are -4.74 and -3.26 eV, respectively. The optimized photovoltaic device based on DR3TDTN：PC71BM blend film shows a power conversion efficiency of 3.03% with an open-circuit voltage of 0.67 V, a short-circuit current of 8.22 mA·cm^-2 and fill factor of 0.55.

关键词： organic solar cells low band gap small molecule HOMO energy level

Synthesis and properties of copolymers based on 5,6-dinitrobenzothiadiazole with low band gap and broad absorption spectra

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Science China Chemistry 2011年第4期54卷 617-624页

作者： WANG Fei LIU YongSheng WAN XiangJian ZHOU JiaoYan CHEN YongSheng Key Laboratory for Functional Polymer Materials and Centre for Nanoscale Science and Technology Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China

One polythiophene derivative PT3T and two low band gap copolymers,PBTT-T3T and PBTT,with different ratios of 5,6-dini-trobenzothiadiazole as the acceptor unit in the polymer backbone have been synthesized by Pd-catalyzed Stille-coupling *** stability,X-ray diffraction analyses,UV-vis absorption spectra,photoluminescence spectra and electrochemical properties of the copolymers were *** band gap estimated from UV-vis-NIR spectra of the copolymers films varied from 1.39 to 1.94 *** these copolymers,the films of PBTT-T3T and PBTT,which contain the 5,6-dinitrobenzothiadiazole unit,cover a broad wavelength range in the visible and near-infrared region from 400 to 1000 nm with the maximal peak absorption around 700 nm,which is exactly matched with the maximum in the photon flux of the sun.

关键词： copolymer broad absorption low band gap charge transfer

Synthesis and properties of novel low band-gap polymers bearing squaraine units

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Chinese Chemical Letters 2010年第2期21卷 245-248页

作者： Zhang, Wei Wang, Zheng Tang, Yu Sheng Xu, Zhi Gang Li, Ying Jiang, Qing Sichuan Univ Coll Chem Chengdu 610064 Peoples R China

Novel main-chain-conjugated poly(carbazol-alt-squaraine) and poly(dipyridyl-alt-squaraine) were successfully synthesized through direct polycondensation of 9-(2-ethylhexyl)carbazole-bridged or dipyridyl-bridged bispyrrole and squaric *** structures and properties of the polymers were characterized using ~1H NMR,FT-IR,UV-vis and cyclic *** polymers exhibit excellent solubility in common organic solvents and good thermal *** UV-vis absorption spectra indicated the polymers have b...

关键词： Squaraine Polymer Synthesis low band gap Organic solar cell material

A Novel BODIPY-Based low-band-gap Small-Molecule Acceptor for Efficient Non-fullerene Polymer Solar Cells

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Chinese Journal of Chemistry 2017年第12期35卷 1813-1823页

作者： Wenxu Liu Jiannian Yao Chuanlang Zhan Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

We report herein an efficient A^1-C=C-A^2-C=C-A^1 type small-molecule 4,4＇-difluoro-4-bora-3a,4a-diaza-sindacene （BODIPY） acceptor （A^1= BODIPY and A^2= diketopyrrolopyrrole （DPP）） by following the A-to-A excited electron delocalization via the BODIPY meso-position, the inherent directionality for the excited electron delocalization. The lowest unoccupied molecular orbital （LUMO） delocalizes across over whole the two flanking A^1 and the central A^2, and the highest occupied molecular orbital （HOMO） localizes dominantly on the -C=C-DPP-C=C- segment. The excited electron upon light excitation of the DPP segment delocalizes over both the BODIPY and DPP segments. The acceptor in chloroform shows an unprecedented plateau-like broad absorption between 550 and 700 nm with a large FWHM value of 195 nm. Upon transition into solid film, the acceptor shows absorption in the whole near ultraviolet-visible-near infrared wavelength region （300-830 nm） with a low band gap of 1.5 eV and a maximum absorptivity of 0.85 × 10^5 cm^-1. Introduction of the ethynyl spacer between the A^1 and A^2 and the close BODIPY-to-DPP LUMO energy levels are crucial for the excited n-electron delocalization across over whole the conjugation backbone. A power conversion efficiency of 6.60% was obtained from the ternary non-fullerene solar cell with PTB7-Th：p-DTS（FBTTh2）2 （0.5 ; 0.5） as the donor materials, which is the highest value among the non-fullerene organic solar cells with BODIPY as the electron acceptor material.

关键词： BODIPY nonfullerene low band gap small molecule acceptor organic solar cell

Tetra-EDOT substituted 3D electrochromic polymers with lower band gaps

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Science China Chemistry 2017年第1期60卷 90-98页

作者： Jingjing Shi Imran Murtaza Shan Shao Xiaosi Zhu Yang Zhao Mengmeng Zhu Osamu Goto Hong Meng School of Advanced Materials Peking University Shenzhen Graduate School Key Laboratory of Flexible Electronics & Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech University Department of Physics International Islamic University

A couple of novel electrochromic materials poly(2,3,4,5-tetrakis(2,3-hydrothieno[3,4-b]dixin-5-yl)-1-methyl-1H-pyrrole)(P(t-EDOT-mPy))and poly(5,5',5",5'"-(thiophene-2,3,4,5-tetrayl)tetrakis(2,3-dihydrothieno[3,4-b][1,4]dioxine))(P(t-EDOTTh))are electrodeposited via multi-position polymerization of their tetra-EDOT substituted monomers t-EDOT-mPy and t-EDOT-Th,*** with the linear 2D structured poly(thiophene)(E_g=2.2 eV)and poly(2,5-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)thiophene)(E_g=1.7eV),P(t-EDOT-Th)(E_g=1.62eV)has the lowest band ***,we speculate that the band gaps of the two polymers,having 3D structures,are decreased in contrast to non-substituted polymers or bi-EDOT substituted polymers,thiophene and *** results indicated that P(t-EDOT-Th)thin films are more stable and show higher transmittance amid two polymers,which may find their utilization in organic optoelectronics.

关键词： conjugated 3D polymers electrochromic polythiophene polypyrrole EDOT low band gap electrochemistry

Two-dimensional photovoltaic copolymers with spatial D-A-D structures: synthesis, characterization and hetero-atom effect

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Science China Chemistry 2015年第2期58卷 276-285页

作者： Ying Li Xiaopeng Xu Zuojia Li Ting Yu Qiang Peng Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry Sichuan University

A series of two-dimensional （2D） conjugated copolymers with spatial D-A-D structures （PTNBTB, PTCBTB, and PTSBTB） consisting of hetero-atom-bridged dithiophene and phenylvinyl-substituted benzothiadiazole blocks in the main chain have been designed, synthesized, and characterized. The structure-property relationships of the resulting copolymers were systematically investigated. The effects of the bridging atoms （N, C, and Si） on their thermal, optical, electrochemical and charge- transporting properties were also studied. PTNBTB exhibits a smaller band gap with red-shifted absorption, whereas PTSBTB possesses deeper HOMO level and higher hole mobility than PTCBTB or PTSBTB. Bulk heterojunction （BHJ） solar cells were fabricated and characterized with the conventional configuration of ITO/PEDOT：PSS/copolymer：PCT^BM （I：I）/Ca/A1. As ex- pected, PTSBTB devices showed the highest PCE, up to 4.01%, which was due to the lower HOMO level, higher carrier mobility, and stronger optical response as well as the finer nanoscale phase separation of the pristine polymer and/or the corresponding blending active layer with PC71BM. The primary results offer useful insights in designing 2D copolymers with spatial D-A-D backbone and different hetero-atom bridged donor units to finely tune the absorptions, electronic energy levels, carrier mobilities and the photovoltaic properties.

关键词： two-dimensional polymers bulk heterojunction solar cells hetero-atom effect low band gap carrier mobility

Effect of Molecular Weight and Processing Additive on the Performance of low bandgap Polymer Solar Cells

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Chinese Journal of Chemistry 2012年第9期30卷 2052-2058页

作者：赵晓礼唐浩为杨大磊李慧徐文涛尹丽杨小牛 Polymer Composites Engineering Laboratory Changehun Institute of Applied ChemistryChinese Academy of ScieneesRenmin St.5625ChangchunJilin 130022China State Key Laboratory of Polymer Physics and Chemistry Changchun institute of Applied ChemistryChinese Academy of SciencesRenmin St.5625ChangchunJilin 130022China Graduate School of the Chinese Academy of Sciences Beijing 100049China Changchun University of Technology ChangchunJilin 130012China

In this work, we synthesized a low bandgap polymer polysilole（-2,6-diyl-alt-5-octylthieno[3,4-c]pyrrole-4,6- dione）（PDTSTPD） with different molecular weights （Mn）. The devices based on PDTSTPD/PC71BM composite are prepared and the dependence of power conversion efficiency （PCE） of the devices on the M,1 of conjugated poly- mers is addressed. We found the hole mobility of PDTSTPD is dependent on the Mn of the polymer, which should be the main reason contributing to the drastic difference of device performance, i.e. the PCE of the device using 10 kDa polymer is only 0.52%, in contrast to 2.3% for 24 kDa polymer device. This PCE data is then further improved to 5.0% via using 1,8-diiodoctane as processing additive to achieve an optimized morphology for the photoactive layer with an appropriate length-scale of phase separation for both exciton dissociation and charge transportation.

关键词： bulk-heterojunction molecular weights low band gap semiconducting polymers solar cells

Small molecular non-fullerene electron acceptors for P3HT-based bulk-heterojunction solar cells

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Science China Chemistry 2014年第7期57卷 973-981页

作者： LIU Xin CAI Ping CHEN DongChen CHEN JunWu SU ShiJian CAO Yong State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials & Devices South China University of Technology

Three small molecules with the same arms and different cores of perylene diimide(PDI)or indaceno[2,1-b:6,5-b']dithiophene(IDT)were designed and synthesized as the acceptor materials for P3HT-based bulk-heterojunction(BHJ)solar *** impacts of the different cores on the optical absorption,electrochemical properties,electron mobility,film morphology,photoluminescene characteristics,and solar cell performance were thoroughly *** three compounds possess a broad absorption covering the wavelength range of 400–700 nm and relatively low lowest unoccupied molecular orbital(LUMO)energy levels of?3.86,?3.81 and?3.99 *** highest power conversion efficiency of 0.82%was achieved for the BHJ solar cells based on SM3 as the acceptor material,the compound with a PDI core.

关键词： bulk-heterojunction solar cells electron acceptor non-fullerene n-type materials low band gap