Donor group influence on dye-sensitized solar cell device performances: Balancing dye loading and donor size
Donor group influence on dye-sensitized solar cell device performances: Balancing dye loading and donor size
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DOI：
10.1016/j.dyepig.2020.109074
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发表时间：
2021-03
影响因子：
4.5
通讯作者：
D. Ndaleh;Dinesh Nugegoda;Jonathon Watson;Hammad Cheema;J. Delcamp
中科院分区：
文献类型：
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作者：
D. Ndaleh;Dinesh Nugegoda;Jonathon Watson;Hammad Cheema;J. Delcamp
考察了四种具有不同氮基给体的近红外(NIR)吸收高光电流有机敏化剂(ND1、ND2、ND3和AP25)在染料敏化太阳能电池(DSC)器件中的应用。将文献中报道的基于三芳胺给体的最高光电流产生有机染料之一(AP2519 mA/cm~2)与分子内电荷转移恒定的π-桥-受体体系的染料进行了比较。具体的受欢迎的捐赠者群体包括笨重的HagFeldt捐赠者(ND1)、咔唑捐赠者(ND2)和大小不等的吲哚捐赠者(ND3)(最大宽度从8奥到26奥拉不等)。计算分析、染料能量学、吸收曲线(溶液中和在二氧化钛上)、器件入射光电流转换效率(IPCE)、电化学阻抗谱、小调制光电压瞬变光谱和器件电流-电压曲线被用于基于给体基团的选择来探测染料的行为。研究发现，平衡施主大小和染料负载量对于提高DSC染料的性能至关重要，因为DSC染料可以访问900 nm附近的低能光子。
Four high photocurrent near-infrared (NIR)-absorbing metal-free organic sensitizers (ND1,ND2,ND3, andAP25) with varying nitrogen-based donor groups are examined for use in dye-sensitized solar cell (DSC) devices. One of the highest photocurrent generating organic dyes based on a triarylamine donor reported in the literature (AP25at 19 mA/cm2) is compared to dyes varying the donor group with constant intramolecular charge transfer π-bridge-acceptor systems. Specific popular donor groups include the bulky Hagfeldt donor (ND1), a carbazole donor (ND2), and an indoline donor (ND3) which varies a large range of sizes (maximum width varies between 8 Å and 26 Å). Computational analysis, dye energetics, absorption profiles (in solution and on TiO2), device incident photon-to-current conversion efficiencies (IPCEs), electrochemical impedance spectroscopy, small modulated photovoltage transient spectroscopy, and device current-voltage curves are used to probe dye behavior based on donor group selection. Balancing donor size and dye loadings was found to be critical for higher performances with the DSC dyes accessing low energy photons near 900 nm.