High-Efficiency All-Small-Molecule Organic Solar Cells Based on an Organic Molecule Donor with Alkylsilyl-Thienyl Conjugated Side Chains
High-Efficiency All-Small-Molecule Organic Solar Cells Based on an Organic Molecule Donor with Alkylsilyl-Thienyl Conjugated Side Chains
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基于具有烷基甲硅烷基-噻吩基共轭侧链的有机分子供体的高效全小分子有机太阳能电池
DOI：
10.1002/adma.201706361
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发表时间：
2018-07-05
影响因子：
29.4
通讯作者：
Li, Yongfang
中科院分区：
文献类型：
--
作者：
Bin, Haijun;Yao, Jia;Li, Yongfang
两个在苯并[1，2-B]上具有烷基硅基-噻吩基共轭侧链的中带隙p型有机小分子H2, 1和H2, 2：合成了4，5-b ']二噻吩中心单元，并将其作为全小分子有机太阳能电池的给体具有窄带隙n型小分子2，2'-（（2 Z，2 'Z）-（（4，4，9，9-四己基-4，9-二氢-s-引达省并[1，2-B：5，6-b ′]二噻吩-2，7-二基）双（亚甲基））双（3-氧代-2，3-二氢-1H-茚-2，1-二亚基））二丙二腈（IDIC）作为受体。与以3-乙基绕丹宁为端基的H21相比，以氰基乙酸酯为端基的H22在共混膜中显示出蓝移吸收、更高的电荷载流子迁移率和更好的3D电荷路径。基于H22：IDIC的SM-OSC的功率转换效率（PCE）达到10.29%，具有较高的开路电压0.942 V和较高的填充因子71.15%。10.29%的PCE是迄今为止文献中报道的非富勒烯SM-OSC的最高效率之一。
Two medium-bandgap p-type organic small molecules H21 and H22 with an alkylsily-thienyl conjugated side chain on benzo[1,2-b:4,5-b']dithiophene central units are synthesized and used as donors in all-small-molecule organic solar cells (SM-OSCs) with a narrow-bandgap n-type small molecule 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) as the acceptor. In comparison to H21 with 3-ethyl rhodanine as the terminal group, H22 with cyanoacetic acid esters as the terminal group shows blueshifted absorption, higher charge-carrier mobility and better 3D charge pathway in blend films. The power conversion efficiency (PCE) of the SM-OSCs based on H22:IDIC reaches 10.29% with a higher open-circuit voltage of 0.942 V and a higher fill factor of 71.15%. The PCE of 10.29% is among the top efficiencies of nonfullerene SM-OSCs reported in the literature to date.