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The Improvement of bulk-heterojunction Order in Polymer Photovoltaic Device

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光谱学与光谱分析 2011年第12期31卷 3175-3179页

作者： YUAN Dan CHEN Zhi-jian XIAO Li-xin MU Li-ping QU Bo GONG Qi-huang State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China

The blend morphology and vertical arrangement are critical to the performance of organic bulk-heterojunction photovoltaic devices.In the present paper,the authors proposed a new annealing method that controls the blend morphology and vertical arrangement of two materials by means of simultaneously applying external electrical field and violet irradiation on the active layer of poly(3-hexylthiophene) (P3HT) and -phenyl C61-butyric acid methyl ester(PCBM) during annealing process.By using this annealing method,the power conversion efficiency increased by 36%,which was caused by vertical phased-separated blend of crystalline P3HT and PCBM and better charge extraction of electrodes.X-ray photoelectron spectroscopy(XPS) was measured to prove more fullerene derivatives at the organic/cathode interfaces by using this annealing method.The X-ray diffraction(XRD) analysis and UV-Vis absorption spectrum analysis also revealed more ordered polymer crystallization.

关键词： Polymer photovoltaic device bulk-heterojunction Annealing method

Performance enhancement in organic solar cells and photodetectors enabled by donor phase optimization at the surface of hole transport layer

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Chinese Chemical Letters 2023年第6期34卷 480-486页

作者： Xiaoyang Du Qian Zhang Zeyu He Hui Lin Gang Yang Zhenhua Chen Caijun Zheng Silu Tao School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China Shanghai Synchrotron Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

The domain purity,material crystallinity and distribution at the interface between the active layer and the transport layer have an important impact on the performance of organic solar cells(OSCs)and organic photodetectors(OPDs),while this focal issue has received less attention in previous studies.From this perspective,a new method to simultaneously enhance the performance of OSC and OPD is proposed,namely,using a sequential deposition method to first construct a compact stacking structure of dualdonor(D18-Cl:PTO2)eutectic in the donor layer,and then induce the ordered deposition of the acceptor(Y6).Compared with the conventional bulk heterojunction(BHJ),the active layer realized by this method not only improves the crystallinity and stacking order of the constituent material on the surface of the transport layer,but also regulates a good vertical distribution,which is conducive to improving the charge transport and extraction efficiency,reducing the leakage current,and enhancing the stability of the device.As a result,the OSC device based on the D18-Cl:PTO2/Y6 structure achieves a power conversion efficiency of up to 17.65%and good light-degradation stability,which is much better than that of BHJbased OSC(PCE of 16.37%).For the OPD,the dark current at reverse bias is reduced by more than an order of magnitude,and the maximum responsivity is improved to 0.52 A/W through the optimization of the donor phase at the interface.Moreover,the strategy does not require additional post-processing compared to the BHJ preparation,which reduces the device construction cost and process complexity,providing an effective way for developing high-performance organic optoelectronic devices.

关键词： Organic solar cells Organic photodetectors Sequential deposition Vertical distribution bulk-heterojunction

Chlorophyll-based organic solar cells with improved power conversion efficiency

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Journal of Energy Chemistry 2019年第11期28卷 88-93页

作者： Shenghan Wang Shengnan Duan Yuwei Wang Chenglin Sun Xiao-Feng Wang Shin-ichi Sasaki Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012JilinChina Nagahama Institute of Bio-Science and Technology NagahamaShiga 526-0829Japan

Chlorophylls(Chls), and associated chlorophyll derivatives, are one of the oldest, most versatile organic semiconductors found in nature. Herein, we present two easily semi-synthesized chlorophyll derivatives, namely, chlorin e6 trimethyl ester(Ce6Me3) and its copper complex(Cu–Ce6 Me3), as the p-type dopants for organic semiconductors and their impact in organic solar cells(OSCs). In our study, both Chls showed intense Soret and Q y bands in the UV-visible spectra, leading to an effect means for capturing solar light and energy. Chls also exhibited high carrier mobility owing to the partial formation of aggregates through the spin-coating process. Using Chls, we fabricated OSCs in both planar-heterojunction(PHJ) and bulkheterojunction(BHJ) solar cell configurations, together with C70/PC70 BM as electron acceptors. In PHJ solar cells, we received solar power conversion efficiencies(PCEs) of only 0.85% and 0.93% for Cu–Ce6 Me 3-and Ce6Me3-based devices, respectively, with the thickness of the donor layer at 5 nm. In BHJ cells, we achieved much higher PCEs of 1.53% and 2.05% for Cu–Ce6Me3 :PC 70 BM and Ce6Me3 :PC 70 BM respectively, where both blending ratios were set to 1:8. The improvement on PCE in BHJ cells may be attributed to the better charge separation increase at the donor–acceptor interface.

关键词： Organic solar cells Chlorophyll derivatives Fullerene Planar-heterojunction bulk-heterojunction

High-efficiency quaternary polymer solar cells enabled with binary fullerene additives to reduce nonfullerene acceptor optical band gap and improve carriers transport

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Science China Chemistry 2018年第12期61卷 1609-1618页

作者： Weiping Li Dong Yan Feng Liu Thomas Russell Chuanlang Zhan Jiannian Yao eijing National Laboratory for Molecular Sciences CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiaotong University Shanghai 200240 China Department of Polymer Science and Engineering Room A516 Conte Research Center University of Massachusetts Amherst120 Governors Drive Amherst MA 01003 USA University of Chinese Academy of Sciences Beijing 100049 China

The polymer/small-molecule electron donor and nonfullerene organic electron acceptor are of structural similarity with both donor and acceptor molecules consisting of polycyclic fused-ring backbone and being decorated with alkyl-chains.In this study,we report that the introduction of binary fullerenes(C_(60)-/C_(70)-PCBM and C_(60)-/C_(70)-ICBA)into a nonfullerene binary system PBDB-T:ITIC reduces the polymer-nonfullerene acceptor intermixing,obtaining higher crystallinity with(100)crystal coherence length from 28 to 29–33 nm for the ITIC,and from 14 to 20–24 nm for the PBDB-T,and improved electron and hole mobilities both.Unprecedentedly,such a protocol reduces the ITIC optical band gap from 1.59 to 1.55 eV.As consequences,higher short-circuit current-density(17.8–18.4 vs.15.8 m A/cm^2),open-circuit voltage(0.92 vs.0.90 V)and fill-factor(0.72–0.73 vs.0.68)are simultaneously obtained,which ultimately afford higher efficient quaternary polymer solar cells with power conversion efficiencies(PCEs)up to 12.0%–12.8%comparing to the host binary device with 9.9%efficiency.For the polymer,ITIC,and ICBA/PCBM ternary blends,11%PCEs were recorded.The use of PCBM leads to larger red-shifting in thin film absorption and external quantum efficiency(EQE)response.Such effect is more pronounced when ICBA:PCBM mixture is used.These results indicate the size and shape of C_(60)and C_(70)as well as the substituent position of the second indene unit on C_(60)-/C_(70)-ICBA affect not only the blend morphology but also the electronic coupling in BHJ mixtures:the quaternary device performance increased in sequences of C_(70)-PCBM:C_(70)-ICBA→C_(70)-PCBM:C_(60)-ICBA→C_(60)-PCBM:C_(70)-ICBA→C_(60)-PCBM:C_(60)-ICBA.The resonant soft X-ray scattering(RSoXS)data indicated the most refined phase separation in the C_(60)-PCBM:C_(60)-ICBA based blend,corresponding to its best device function among the quaternary devices.These results indicate that the using of binary fullerenes as the acceptor additives allows for tuning nonfullerene blended fi

关键词： quaternary bulk-heterojunction polymer solar cell nonfullerene acceptor fullerene-free fullerene

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

Synthesis and properties of polyfluorene copolymers bearing thiophene and porphyrin

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Chinese Chemical Letters 2007年第7期18卷 879-882页

作者： Xing Xu Hao Chen Xian Rong Cai Ying Li Qing Jiang College of Chemistry Sichuan University Chengdu 610064 China

To search for more wider absorption and higher charge carriers mobilities materials of polymer solar cell, a series of soluble alternating polyfluorene copolymers were synthesized by palladium-catalyzed Suzuki coupling reaction. Their structures were determined by 1H NMR, IR and UV-vis. And their UV-vis absorption spectra indicated that they had strong absorption over 600 nm spectral range and nearly cover 400-700 nm visible region. The band gaps of copolymers calculated according to cyclic voltammetry （CV） were between 1.96 and 2.03 eV. Polymer：TiO2 bulk-heterojunction films were made from mixtures of polymer and titanium isopropoxide, a precursor for TiO2, via hydrolysis in air overnight. The photoluminescence at 380-800 nm of the blend film of PT-TPP20 （5 mg/mL）：Ti（OC3H7）4 （80 μL/mL）（20% volume fraction） was significantly quenched in the 50% Ti（OC3H7）4 blend film, indicating that rapid and efficient separation of photoinduced electron-hole pairs.

关键词： Polyfluorene copolymers Synthesis Absorption bulk-heterojunction

Dipyrrin-based Complexes for Solution-processed Organic Solar Cells

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Chemical Research in Chinese Universities 2015年第5期31卷 801-808页

作者： ZOU Liyun GUAN Shuang LI Leijiao ZHAO Li School of Life Sciences Jilin University Changchun 130012 P. R. China College of Chemistry and Life Sciences Changchun University of Techology Changchun 130012 P. R. China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

Three dipyrrin-containing metal complexes and a boron dipyrromethene（BODIPY）-containing complex were designed and synthesized. The photophysical properties, electrochemical behaviours and photovoltaic performance were extensively investigated. Density functional theory calculations were also performed on those complexes These complexes, together with electron-acceptor [6,6]-phenyl-C71-butyric acid methyl ester, were utilized for the fabrication of solution-processed bulk heterojunction solar cells as the electron-donor materials. The more efficient electron acceptor BODIPY segment renders a lower energy gap and a relatively better photovoltaic conversion efficiency of 0.58%. These results prove that BODIPY segment has a great potential for constructing efficient organic solar cell materials.

关键词： Dipyrrin-metal Boron dipyrromethene（BODIPY） Solution-processed bulk-heterojunction Organic solar cell

Charge Carrier Dynamics in PDPP-F/PCBM heterojunction Solar Cells

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Chemical Research in Chinese Universities 2016年第6期32卷 1034-1037页

作者： ZHANG Peng TAN Mingrui SUI Ning WANG Yinghui TIAN Chunlin ZHANG Hanzhuang College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangehun 130022 R R. China Coherent Light and Atomic and Molecular Spectroscopy Laboratory College of Physics Jilin University Changchun 130012 P. R. China Key Laboratory of Physics and Technology for Advanced Batteries Ministry of Education College of Physics Jilin University Changehun 130012 P. R. China

The morphology dependent of migration and recombination kinetics of charge carriers in the polymersolar cell based on poly {2,7′-9,9-dioctyfiuorene-alt-5-diethylhexyl-3,6-bis（5-bromothiophen-2-yl）pyrrolo[3,4-c]-pyrrole-1,4-dione}（PDPP-F） was investigated with photo-induced charge carrier extraction by linearly increasingvoltage technique. The recombination coefficient of charge carriers decreased and the mobility of charge carriersincreased, after the mass ratio of [6,6]-phenyl-C61-butyric acid methyl ester（PCBM） increased from 3：2 to 2：1.Meanwhile, both of them were sensitive to the applied electric field and could be together responsible for theimprovement of voltage performance of polymer solar cell.

关键词： Solar cell bulk-heterojunction Charge carrier transport Charge carrier recombination

Ternary organic solar cells based on polymer donor,polymer acceptor and PCBM components

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Chinese Chemical Letters 2020年第3期31卷 865-868页

作者： Feng Liu Cheng Li Junyu Li Chao Wang Chengyi Xiao Yonggang Wu Weiwei Li College of Chemistry and Environmental Science Hebei UniversityBaoding 071002China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China DSM DMSC R&D Solutions Geleen 6160 MDthe Netherlands

In this work,ternary organic solar cells(OSCs)combining a fullerene derivative PC71BM with a nonfullerene acceptor N2200-F blended with a polymer donor PM6 were reported.Compared with the binary systems,the highest power conversion efficiency(PCE)of 8.11%was achieved in ternary solar cells with 30 wt%N2200-F content,mainly due to the improved short-circuit current density(Jsc)and fill factor(FF).Further studies showed that the improved Jsc could attribute to the complementary abso rption of the two acceptors and the enhanced FF was originated from the higher hole mobility and the fine-tuned morphology in the ternary system.These results demonstrate that the combination of fullere ne and nonfullerene acceptors in ternary organic solar cells is a promising approach to achieve high-performance OSCs.

关键词： Ternary organic solar cell Fullerene Non-fullerene bulk-heterojunction Charge transport