An Jincheng, Yang Xichuan, Cai Bin, Zhang Li, Yang Kaiyuan, Yu Ze, Wang Xiuna, Hagfeldt Anders, Sun Licheng
State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116024, China.
Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.
ACS Appl Mater Interfaces. 2020 Oct 14;12(41):46397-46405. doi: 10.1021/acsami.0c14952. Epub 2020 Sep 30.
Three novel dyes consisting of a 5,8,15-(2-ethylhexyl)-8,15-dihydro-5-benzo[1,2-:3,4-':6,5-″]tricarbazole (BTC) electron-donating group and a 4,7-(4-hexylthiophen-2-yl)benzo[][1,2,5]thiadiazole (BTBT) π-bridge with an anchoring group of phenyl carboxyl acid were synthesized and applied in dye-sensitized solar cells (DSCs).The AJ202 did not contain any triple bonds, the AJ201's ethynyl group was inserted between the BTC and BTBT units, and the AJ206's ethynyl group was introduced between the BTBT moiety and the anchor group. The inclusion and position of the ethynyl linkage in the sensitizer molecules significantly altered the electrochemical properties of these dyes, which can fine-tune the energy levels of the dyes. The best performing devices contained as a sensitizer and a Cu(I/II) redox couple, which resulted in a power conversion efficiency (PCE) up to 10.8% under the standard AM 1.5 G illumination, which obtained PCEs higher than those from the devices that contained (9.2%) and (9.7%) under the same conditions. The highest occupied molecular orbital and lowest unoccupied molecular orbital levels of the sensitizers were tuned to be well-suited for the Cu(I/II) redox potential and the Fermi level of TiO. The innovative synthesis of a tricarbazole-based donor moiety in a sensitizer used in combination with a Cu(I/II) redox couple has resulted in relatively high PCEs.
合成了三种新型染料，它们由一个5,8,15-(2-乙基己基)-8,15-二氢-5-苯并[1,2-:3,4-':6,5-″]三咔唑（BTC）给电子基团、一个4,7-(4-己基噻吩-2-基)苯并[][1,2,5]噻二唑（BTBT）π桥以及一个苯基羧酸锚定基团组成，并将其应用于染料敏化太阳能电池（DSC）中。AJ202不含任何三键，AJ201的乙炔基插入在BTC和BTBT单元之间，而AJ206的乙炔基引入在BTBT部分和锚定基团之间。敏化剂分子中乙炔键的包含及其位置显著改变了这些染料的电化学性质，这可以微调染料的能级。性能最佳的器件包含作为敏化剂和Cu(I/II)氧化还原对，在标准AM 1.5 G光照下，其功率转换效率（PCE）高达10.8%，在相同条件下，该器件的PCE高于包含（9.2%）和（9.7%）的器件。将敏化剂的最高占据分子轨道和最低未占据分子轨道能级调整为与Cu(I/II)氧化还原电位和TiO的费米能级相匹配。在敏化剂中创新合成基于三咔唑的供体部分并与Cu(I/II)氧化还原对结合使用，已产生了相对较高的PCE。
