• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Development of Benzodithiophene-Based A-D-A Small Molecules with Different Acceptor End Groups for Efficient Organic Solar Cells

    2019-01-23 08:21:56JIAGuoxiaoZHANGShaoqingYANGLiyanHEChangFANHuiliHOUJianhui
    物理化學(xué)學(xué)報 2019年1期

    JIA Guoxiao , ZHANG Shaoqing ,*, YANG Liyan , HE Chang , FAN Huili ,*, HOU Jianhui ,,*

    1 School of Chemical and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.

    2 State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

    Abstract: In recent years, organic solar cells (OSCs) have attracted increasing attention, and the power conversion efficiency (PCE) of OSCs has markedly improved. To enhance the photovoltaic properties of OSCs, it is important to develop the donor materials in the light-harvesting layer, which mainly include conjugated polymers and small molecules (SMs). Compared with polymeric materials, small-molecule materials have been widely investigated for their superior characteristics, such as well-defined molecular structures that can provide good batch-to-batch reproducibility. In this work,we synthesized three SM donor materials with theacceptor-donor-acceptor(A-D-A) structure by employing the trialkylthienyl-substituted benzodithiophene (TriBDT-T) unit as the D-core unit, and rhodanine (RN), cyano-rhodanine (RCN), and 1,3-indanone (IDO)as the A end groups, respectively. The optical properties, molecular energy levels, and thermogravimetic characteristics of the three SMs were studied; moreover, the blend morphologies and photovoltaic properties of the devices by employing the non-fullerene (NF) acceptor, IT-4F, were systematically investigated. The results showed that 1) the three SMs exhibit good thermal stabilities as evinced by thermogravimetric analysis (TGA), and all decomposition temperatures exceeded 410 °C; 2) They all exhibit strong and broad absorption in the visible light range (300–700 nm), and show similar molar extinction coefficients; 3) the HOMO levels are -5.47 eV, -5.54 eV, and -5.44 eV for RN, RCN, and IDO, respectively,implying the clear influence of the different end groups for the energy levels of the A-D-A-type SMs; the slight differences in the optical and electrochemical properties of the corresponding donor material could be attributed to the different electron-withdrawing ability of the A-type end groups. When studying the photovoltaic properties, interestingly, the RN∶IT-4F blend was found to form fibrillar-like aggregates with appropriate size, and the corresponding devices exhibited desirable short circuit current (Jsc) and thus the highest PCE value of 9.25%; however, large-size aggregates were formed in the RCN∶IT-4F and IDO∶IT-4F blend films, resulting in a much lower Jsc and fill factor (FF), and the PCE of the corresponding devices were only around 6%. In summary, by introducing RN, RCN, and IDO as the A units, we synthesized a class of TriBDT-T based A-D-A type SMs. This study shows that terminal A units exert influence on the absorption spectra,molecular energy level, and morphologies after blending with the acceptor material, and hence, the corresponding devices exhibit significant differences in photovoltaic performance. This work also provides useful information for the molecular design of SM donor materials.

    Key Words: Small molecule donor; Terminal modification; Organic solar cells; Non-fullerene acceptor; Acceptor-Donor-Acceptor structure

    大丰市| 新宾| 新密市| 咸阳市| 汉源县| 凤冈县| 平顶山市| 三门峡市| 海丰县| 卫辉市| 石屏县| 福泉市| 无为县| 西盟| 沈丘县| 五寨县| 大安市| 吉隆县| 资溪县| 石城县| 洮南市| 富川| 龙门县| 贵溪市| 佛坪县| 义马市| 忻州市| 小金县| 广水市| 长子县| 白朗县| 武宁县| 托克逊县| 湖口县| 通城县| 纳雍县| 偏关县| 翁源县| 西乡县| 云和县| 连州市|