An Organic "Donor-Free" Dye with Enhanced Open-Circuit Voltage in Solid-State Sensitized Solar Cells
An Organic "Donor-Free" Dye with Enhanced Open-Circuit Voltage in Solid-State Sensitized Solar Cells
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DOI：
10.1002/aenm.201400166
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发表时间：
2014-09-16
影响因子：
27.8
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
--
作者：
Abate, Antonio;Planells, Miquel;Snaith, Henry J.
设计用于敏化太阳能电池的新有机染料的主要近期趋势是将共辄π-间隔基一侧上的吸电子基团（受体，A）和另一侧上的一个或多个供电子基团（供体，D）组合，这产生供体-π-受体（D-π-A）染料。在这里，我们报道了用氰基丙烯酸末端官能化的寡聚（3-己基噻吩）作为"无供体"染料（π-A）敏化的固态电池，其具有与最先进的D-π-A染料竞争的功率转换效率。我们表明，没有一个电子供体基团的显着更高的开路电压（V oc）实现，同时保持短路电流。结合实验和理论研究，我们得出结论，提高Voc是由于更高的稳态浓度的氧化染料，这增加了跨TiO 2空穴传输异质结的电位偏移。这项工作质疑了固态染料敏化太阳能电池工作原理的基本前提，并为有机染料敏化剂的设计策略开辟了新的方向。
The predominant recent trend in designing new organic dyes for sensitized solar cells has been to combine an electron-withdrawing group (acceptor, A) on one side of a conjugated π-spacer and one or more electron-donating groups (donor, D) on the other side, which generate a donor-pi-acceptor (D-π-A) dye. Here, we reported solid-state cells sensitized with cyanoacrylic end-functionalized oligo (3-hexylthiophene) as a “donor-free” dye (π-A) with power conversion efficiency competitive with the state-of-the-art D-π-A dyes. We show that without an electron donor group a significantly higher open circuit voltage (V oc) is achieved, while maintaining short circuit current. By combining experimental and theoretical investigation, we conclude that improved V oc is due to higher steady-state concentration of oxidized dye, which increases the potential offset across the TiO 2-hole transporter heterojunction. This work questions the basic premise of the operating principles of solid-state dye-sensitized solar cells and opens a new direction for organic dye-sensitizer design strategy.