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首页> 美国卫生研究院文献>ACS Omega >Novel D–A−π–A-Type OrganicDyes Containing a Ladderlike Dithienocyclopentacarbazole Donor forEffective Dye-Sensitized Solar Cells
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Novel D–A−π–A-Type OrganicDyes Containing a Ladderlike Dithienocyclopentacarbazole Donor forEffective Dye-Sensitized Solar Cells

机译：新型D–A–π–A型有机含有梯形二硫杂环戊碳咔唑供体的染料有效的染料敏化太阳能电池

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摘要

A novel ladderlike fused-ring donor, dithienocyclopentacarbazole (DTCC) derivative, is used to design and synthesize three novel donor–acceptor−π–acceptor-type organic dyes (C1–C3) via facile direct arylation reactions, in which the DTCC derivative substituted by four p-octyloxyphenyl groups is served as the electron donor and the carboxylic acid group is used as the electron acceptor or anchoring group. To fine-tune the optical, electrochemical, and photovoltaic properties of the three dyes, various auxiliary acceptors, including benzo[2,1,3]thiadiazole (BT), 5,6-difluorobenzo[2,1,3]thiadiazole (DFBT), and pyridal[2,1,3]thiadiazole (PT), are incorporated into the dye backbones. The results indicate that all of the three dyes exhibit strong light-capturing ability in the visible region and obtain relatively high molar extinction coefficients (>31 000 M–1 cm–1) due to their strong charge transfer (CT) from donor to acceptor. Moreover, theoretical model calculations demonstrate fully separated highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels for the three dyes, which is helpful for efficient charge separation and electron injection. Using the three dyes assensitizers, conventional dye-sensitized solar cells (DSSCs) basedon liquid iodide/triiodide redox electrolytes are fabricated. Ourresults indicate that the BT-containing dye C1 affords the highestpower conversion efficiency of up to 6.75%, much higher than thatof the DFBT-containing dye C2 (5.40%) and the PT-containing dye C3(1.85%). To our knowledge, this is the first example reported in theliterature where the DTCC unit has been used to develop novel organicdyes for DSSC applications. Our work unambiguously demonstrates thatthe ladderlike DTCC derivatives are the superb electron-donating blocksfor the development of high-performance organic dyes
机译：一种新颖的梯状稠环供体，二硫杂环戊碳咔唑（DTCC）衍生物，用于通过容易的直接芳基化反应设计和合成三种新颖的供体-受体-π-受体型有机染料（C1-C3），其中DTCC衍生物被取代四个对-辛基氧基苯基基团用作电子给体，而羧酸基团用作电子受体或锚定基团。为了微调这三种染料的光学，电化学和光伏性质，使用各种辅助受体，包括苯并[2,1,3]噻二唑（BT），5,6-二氟苯并[2,1,3]噻二唑（DFBT） ）和吡啶并[2,1,3]噻二唑（PT）被掺入染料骨架。结果表明，三种染料均在可见光区具有较强的光捕获能力，并且具有相对较高的摩尔消光系数（> 31 000 M –1 cm –1 ），因为它们从捐赠者到接受者的电荷转移很强。此外，理论模型计算表明，三种染料完全分离的最高占据分子轨道和最低未占据分子轨道能级，这有助于有效的电荷分离和电子注入。使用三种染料作为敏化剂，基于传统的染料敏化太阳能电池（DSSC）在液体碘化物/三碘化物氧化还原电解质上制备。我们的结果表明，含BT的染料C1提供了最高的功率转换效率高达6.75％，远高于该值含DFBT的染料C2（5.40％）和含PT的染料C3的含量（1.85％）。据我们所知，这是DTCC单元已用于开发新型有机化合物的文献用于DSSC应用的染料。我们的工作明确表明梯状的DTCC衍生物是极好的给电子体用于开发高性能有机染料

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