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Science Bulletin 2019年第8期64卷 547-552页

作者： Tingting Wu Chao Zhen Jinbo Wu Chunxu Jia Mustafa Haider Lianzhou Wang Gang Liu Hui-Ming Cheng Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China University of Chinese Academy of Sciences Nanomaterials Centre School of Chemical Engineering and AIBN The University of Queensland Low-Dimensional Material and Device Laboratory Tsinghua-Berkeley Shenzhen Institute Tsinghua University

SnO_2 quantum dots(QDs) ended with chlorine ions are introduced at the interface of spin-coated TiO_2 electron selective layer(ESL)/perovskite to fill the pinholes in the layer and passivate the trapping defects. As a result of the increased interface electron collection and reduced bulk recombination, the planar perovskite solar cell with the QDs modified ESL gives the large power conversion efficiency enhancement from 14.9% to 17.3% and greatly improved stability under the continuous light irradiation.

关键词： TiO2 SnO2 quantum dots Interface modification Perovskite solar cells

Benzothiadiazole-based hole transport materials for high-efficiency dopant-free perovskite solar cells: Molecular planarity effect

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Journal of Energy Chemistry 2020年第5期29卷 115-120页

作者： Xiang Zhou Fantai Kong Yuan Sun Yin Huang Xianxi Zhang Rahim Ghadari Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Applied TechnologyHefei Institutes of Physical Science.Chinese Academy of SciencesHefei 230088AnhuiChina University of Science and Technology of China Hefei 230026AnhuiChina Shandong Provincial Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology Liaocheng UniversityLiaocheng 252000ShandongChina Computational Chemistry Laboratory Department of Organic and BiochemistryFaculty of ChemistryUniversity of Tabriz*** TabrizIran

A new benzothiadiazole-based D-A-D hole transport material(DTBT)has been designed and synthesized with a more planar structure by introducing of thiophene bridges.The results indicate a lower band gap and quite higher hole mobility for the DTBT.Furthermore,the enhancement in molecular planarity with simple thiophene unit increases the hole mobility of DTBT(8.77×10^-4cm^2 V^-1s^-1)by about 40%.And when DTBT is used as hole transport material in perovskite solar cells,the photoelectric conversion efficiency of the corresponding dopant-free devices is also significantly improved compared with that of the conventional BT model molecule without thiophene.In terms of device stability,DTBT-based devices show a favorable long-term stability,which keep 83%initial efficiency after 15 days.Therefore,the introducing of thiophene bridges in D-A-D typed HTMs can improve the molecular planarity effectively,thereby increasing the hole mobility and improving device performance.

关键词： Hole transport materials Planarity Perovskite solar cells

TTA as a potential hole transport layer for application in conventional polymer solar cells

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Journal of Energy Chemistry 2020年第3期29卷 210-216页

作者： Le Liu Saisai Zhou Chengjie Zhao Tonggang Jiu Fuzhen Bi Hongmei Jian Min Zhao Guodong Zhang Lejia Wang Fenfen Li Xunwen Xiao College of Material Science and Chemical Engineering Ningbo University of TechnologyNingbo 315211ZhejiangChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101ShandongChina

Hole transport layers(HTLs)play a vital role in organic solar cells(OSCs).In this work,a derivative of tetrathiafulvalene with four carboxyl groups TTA was introduced as a novel HTL to fabricate OSC with high performance.Displaying a better energy level match between HTL and active layers,the TTA based devices show a peak power conversion efficiency of 9.09%,which is comparable to the devices based on PEDOT:PSS.The favorable surface morphology recorded via atomic force microscopy,low series loss and charge recombination indicated by electrochemical impedance spectroscopy,synchronously verify the potential of TTA for application in OSCs as a valid kind of HTLs.

关键词： Organic solar cells Hole transport layer TTA Energy level Charge recombination

Thermal Analysis of a Volumetric solar Receiver

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Journal of Thermal Science 2019年第6期28卷 1176-1185页

作者： CHEN Longfei YANG Ming LI Jinping BAI Yakai LI Xiaoxia TANG Wenxue YANG Nancong WANG Zhifeng Lanzhou University of Technology Lanzhou 730050China Key Laboratory of solar Thermal Energy and Photovoltaic Systems Chinese Academy of SciencesBeijing 100190China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Engineering Research Center of solar Thermal Power Beijing 100190China Beijing CSP International Cooperation Centre Beijing 100190China Joint Laboratory Institute of Electrical EngineeringChinese Academy of Sciences and Guangdong Five Star Solar Energy Co.Ltd.Beijing 100190China Guangdong 5 Star solar Energy CO.LTD Dongguan 523051China

The volumetric receiver has received wide attention due to its high thermal efficiency. This paper studied a new type of a solid-liquid composite volumetric receiver. The heat transfer in a solid-liquid composite volumetric solar receiver was analyzed using a one-dimensional unsteady simulation model of the solid-liquid receiver. The model included absorption of the incident solar radiation by the glass window, the silicon carbide porous ceramic heat absorber panel and the water. The results were verified against experimental data for a volumetric receiver and the error did not exceed 10%. It can be used to predict the heat transfer in solid-liquid composite volumetric receivers.

关键词： solar receiver solid-liquid composite absorber silicon carbide porous ceramic volumetric solar collector

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

Highly stable carbon-based perovskite solar cell with a record efficiency of over 18% via hole transport engineering

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Journal of Materials Science & Technology 2019年第6期35卷 987-993页

作者： Qian-Qian Chu Bin Ding Jun Peng Heping Shen Xiaolei Li Yan Liu Cheng-Xin Li Chang-Jiu Li Guan-Jun Yang Thomas P. White Kylie R. Catchpole State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University 28 West Xianning RoadXi'an 710049 China Research School of Engineering The Australian National University Canberra ACT 2601 Australia

Carbon-based perovskite solar cells show great potential owing to their low-cost production and superior stability in air, compared to their counterparts using metal contacts. The photovoltaic performance of carbon-based PSCs, however, has been progressing slowly in spite of an impressive efficiency when they were first reported. One of the major obstacles is that the hole transport materials developed for stateof-the-art Au-based PSCs are not suitable for carbon-based PSCs. Here, we develop a low-temperature,solution-processed Poly(3-hexylthiophene-2,5-diyl)(P3 HT)/graphene composite hole transport layer(HTL), that is compatible with paintable carbon-electrodes to produce state-of-the-art perovskite devices. Space-charge-limited-current measurements reveal that the as-prepared P3 HT/graphene composite exhibits outstanding charge mobility and thermal tolerance, with hole mobility increasing from8.3 × 10^-3 cm^2 V-1 s-1(as-deposited) to 1.2 × 10^-2 cm2 V^-1 s^-1(after annealing at 100°C)-two orders of magnitude larger than pure P3 HT. The improved charge transport and extraction provided by the composite HTL provides a significant efficiency improvement compared to cells with a pure P3 HT HTL. As a result, we report carbon-based solar cells with a record efficiency of 17.8%(certified by Newport);and the first perovskite cells to be certified under the stabilized testing protocol. The outstanding device stability is demonstrated by only 3% drop after storage in ambient conditions(humidity: ca. 50%) for 1680 h(nonencapsulated), and retention of ca. 89% of their original output under continuous 1-Sun illumination at room-temperature for 600 h(encapsulated) in a nitrogen environment.

关键词： Planar carbon-based perovskite solar cells Hole transport engineering Recorded efficiency Excellent moisture and light stability

Breaking 12% efficiency in flexible organic solar cells by using a composite electrode

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Science China Chemistry 2019年第7期62卷 851-858页

作者： Guang Zeng Jingwen Zhang Xiaobin Chen Hongwei Gu Yaowen Li Yongfang Li Laboratory of Advanced Optoelectronic Materials College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China College of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 China

The performance of flexible organic solar cells(OSCs)significantly relies on the quality of transparent flexible electrode.Here,we used silver nanowires(AgNWs)with various weight ratios to dope high-conductive poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PH1000)to optimize the optical and electronic properties of PH1000 film.A high-quality flexible composite electrode PET/Ag-mesh/PH1000:AgNWs-20 with smooth surface,a low sheet resistance of 6Ω/sq and a high transmittance of 86%at 550-nm wavelength was obtained by doping 20 wt%AgNWs to PH1000(PH1000:AgNWs-20).The flexible OSCs based on the PET/Ag-mesh/PH1000:AgNWs-20 electrode delivered a power conversion efficiency(PCE)of12.07%with an open circuit voltage(Voc)of 0.826 V,a short-circuit current density(Jsc)of 20.90 m A/cm2and a fill factor(FF)of69.87%,which is the highest reported PCE for the flexible indium-tin oxide(ITO)-free OSCs.This work demonstrated that the flexible composite electrodes of PET/Ag-mesh/PH1000:AgNWs are promising alternatives for the conventional PET/ITO electrode,and open a new avenue for developing high-performance flexible transparent electrode for optoelectronic devices.

关键词： flexible electrodes flexible organic solar cells silver nanowire composite electrode power conversion efficiency

Fluorination-substitution effect on all-small-molecule organic solar cells

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Science China Chemistry 2019年第7期62卷 837-844页

作者： Qiong Wu Dan Deng Jianqi Zhang Wenjun Zou Yang Yang Zhen Wang Huan Li Ruimin Zhou Kun Lu Zhixiang Wei CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Sino-Danish College University of Chinese Academy of Sciences Beijing 100190 China

Due to the strong crystallinity and anisotropy of small molecules, matched molecular photoelectric properties and morphologies between small molecules and non-fullerene acceptors are especially important in all-small-molecule organic solar cells(OSCs).Introducing fluorine atoms has been proved as an effective strategy to achieve a high device performance through tuning molecular energy levels, absorption and assembly properties. Herein, we designed a novel benzodithiophene-based small molecule donor BDTF-CA with deep highest occupied molecular orbital(HOMO) energy level. All-small-molecule OSCs were fabricated by combing non-fullerene acceptor IDIC with different fluorine-atom numbers. Two or four fluorine atoms were introduced to the end-capped acceptor of IDIC, which are named as IDIC-2 F and IDIC-4 F, respectively. With the increase of fluorination from IDIC to IDIC-4 F, the open circuit voltage(Voc) of the devices decreased, while hole and electron mobilities of the active layers increased by one order of magnitude. Contributed to the most balanced Voc, short-circuit current(Jsc) and fill factor(FF), the device based on BDTF-CA/IDIC-2 F achieved the highest power conversion efficiency of 9.11%.

关键词： organic solar cells all-small-molecule fluorination blend morphology energy levels

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Science China Chemistry 2019年第6期62卷 739-745页

作者： Fan Liu Shiqing Bi Xiaorui Wang Xuanye Leng Mengmeng Han Baoda Xue Qianqian Li Huiqiong Zhou Zhen Li Department of Chemistry Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials Wuhan University CAS Key Laboratory of Nanosystem and Hierachical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Institute of Molecular Aggregation Science Tianjin University

By intelligently utilizing the odd-even effect existing in the melting points of alkanes as presented in the basic textbook of Organic Chemistry, different alkoxy groups were introduced to modify the structure of commercial Spiro-OMeTAD to give new Spiro derivatives of Spiro-OEtTAD, Spiro-OPrTAD, Spiro-OiPrTAD and Spiro-OBuTAD, with the aim to adjust the molecular packing status in perovskite solar cells as hole transporting compounds. Excitedly, with the introduction of ethoxy groups instead of the methoxy ones in Spiro-OMeTAD, Spiro-OEtTAD-based perovskite solar cells demonstrated the highest device performance of 20.16%, higher than that of Spiro-OMeTAD(18.64%).

关键词： perovskite solar cells alkyl chains molecular packing

Surface morphology and impurity distribution of electron beam recrystallized silicon films on low cost substrates for solar cell absorber

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Rare Metals 2006年第Z1期25卷 195-200页

作者： GROMBALL F MüLLER J Department of Mikrosystemtechnik Technische Universitt Hamburg-Harburg Hamburg 21073 Germany

A line shaped electron beam recrystallised polycrystalline silicon film on the low cost substrate was investigated for the use of the solar cell absorber. The applied EB energy density strongly influences the surface morphology of the film system. Lower EB energy density results in droplet morphology and the rougher SiO2 capping layer due to the low fluidity. With the energy increasing, the capping layer becomes smooth and continuous and less and small pinholes form in the silicon film. Tungstendisilicide (WSi2) is formed at the interface tungsten/silicon but also at the grain boundaries of the silicon. Because of the fast melting and cooling of the silicon film, the eutectic of silicon and tungstendisilicide mainly forms at the grain boundary of the primary silicon dendrites. The SEM-EDX analysis shows that there are no chlorine and hydrogen in the area surrounding a pinhole after recrystallization because of outgassing during the solidification.

关键词： polycrystalline silicon film solar cell recrystallization energy surface morphology outgassing