Synthesis and Photovoltaic Properties of Two Dimensional Organic Dyes Containing Benzothiadiazole Unit

Cao, Zhencai; He, Zhou; Deng, Lijun; Tan, Songting

doi:10.6023/cjoc201309006

Cited by 2 publications

(1 citation statement)

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“…(11.18 mA/ cm 2 ). 但与前一研究 [34] 的 CD2 相比较, 由于 ZD3 中引入叁键, 导致最大吸收的摩尔吸图 5 染料的最优化结构、电子密度分布图、能级值及能级带隙 Figure 5 Calculated molecular coplanarity, molecule orbitals and energy levels and band gaps of the dyes [23] .…”

Section: Zd1 Zd2 Zd3unclassified

Synthesis and Photovoltaic Properties of Organic Dyes Containing Dendritic and 3D Triphenylamine Derivatives

Zhou¹,

Xie²,

Wu³

et al. 2019

Chin. J. Org. Chem.

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Three organic dyes with dendritic and 3D triphenylamine derivatives as the donor unit, benzoic acid as the acceptor unit and benzothiadiazole (BT) or difluorobenzothiadiazole (DFBT) as the second acceptor were designed and synthesized. The influences of different donors and second acceptors on the photophysical, electrochemical and photovoltaic properties of dye-sensitizers were systematically investigated. The organic dye with dendritic triphenylamine derivative as a donor unit possesses a higher molar absorption coefficient, and the organic dye with 3D triphenylamine derivative (IDTTPA) as a donor unit has a broader absorption spectrum. The dye-sensitized solar cells based on three organic dyes achieved power conversion efficiencies of 5.27%, 4.22% and 5.50%, respectively. After optimizing the battery with 1 mmol•L-1 co-adsorbent chenodeoxycholic acid (CDCA), the power conversion efficiencies of the organic dyes were increased to 5.46%, 4.98% and 6.26%, respectively. Keywords triphenylamine; benzothiadiazole; organic dye; photovoltaic property 自 1991 年 Grätzel 等将多孔 TiO 2 作为光阳极应用到染料敏化太阳能电池(DSSCs)中以来, DSSCs 得到了广泛的关注与发展 [1～11]. 新型结构的染料敏化剂不断被开发出来. 其中, 基于钌配合物和卟啉金属配合物的染料敏化太阳能电池能量转换效率分别超过了 11% [12] 和 13% [13] , 然而, 贵金属价格昂贵及资源有限等缺点限制了其广泛应用. 不含金属的纯有机染料以结构设计相对简单、制作成本较低等因素得到了人们的重视 [14,15]. 研究者们对多种纯有机染料进行了研究, 如香豆素 [16,17] 、咔唑 [18,19] 、吩噻嗪 [20,21] 、三苯胺 [22～24] 、吲哚 [25～27] 衍生物染料等. 目前基于纯有机染料的 DSSCs 获得了 14.3%的最高能量转换效率 [28]. 在纯有机染料中, 三苯胺基团及其衍生物具有强的给电子及传输空穴能力, 特别是三苯胺及其衍生物具有非平面结构, 可以有效地减少分子间的 π-π 堆积程度, 从而降低染料在 TiO 2 薄膜上的聚集 [22,23]. 另外, 作为电子受体的苯并噻二唑(BT)也已应用于染料分子中 [29～31] .

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Section: Zd1 Zd2 Zd3unclassified