Grobelny Anna, Shen Zhongjin, Eickemeyer Felix T, Antariksa Naura F, Zapotoczny Szczepan, Zakeeruddin Shaik M, Grätzel Michael
Laboratory of Photonics and Interfaces (LPI), Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland.
Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków, 30-387, Poland.
Adv Mater. 2023 Feb;35(5):e2207785. doi: 10.1002/adma.202207785. Epub 2022 Dec 27.
Photosensitizers yielding superior photocurrents are crucial for copper-electrolyte-based highly efficient dye-sensitized solar cells (DSCs). Herein, two molecularly tailored organic sensitizers are presented, coded ZS4 and ZS5, through judiciously employing dithieno[3,2-b:2″,3″-d]pyrrole (DTP) as the π-linker and hexyloxy-substituted diphenylquinoxaline (HPQ) or naphthalene-fused-quinoxaline (NFQ) as the auxiliary electron-accepting unit, respectively. Endowed with the HPQ acceptor, ZS4 shows more efficient electron injection and charge collection based on substantially reduced interfacial charge recombination as compared to ZS5. As a result, ZS4-based DSCs achieve a power conversion efficiency (PCE) of 13.2% under standard AM1.5G sunlight, with a high short-circuit photocurrent density (J ) of 16.3 mA cm , an open-circuit voltage (V ) of 1.05 V and a fill factor (FF) of 77.1%. Remarkably, DSCs sensitized with ZS4 exhibit an outstanding stability, retaining 95% of their initial PCE under continuous light soaking for 1000 h. It is believed that this is a new record efficiency reported so far for copper-electrolyte-based DSCs using a single sensitizer. The work highlights the importance of developing molecularly tailored photosensitizers for highly efficient DSCs with copper electrolyte.
对于基于铜电解质的高效染料敏化太阳能电池（DSC）而言，能够产生优异光电流的光敏剂至关重要。在此，通过分别明智地采用二噻吩并[3,2 - b:2″,3″ - d]吡咯（DTP）作为π - 连接体，以及己氧基取代的二苯基喹喔啉（HPQ）或萘并喹喔啉（NFQ）作为辅助电子接受单元，展示了两种分子定制的有机光敏剂，编码为ZS4和ZS5。与ZS5相比，由于界面电荷复合大幅减少，赋予HPQ受体的ZS4表现出更高效的电子注入和电荷收集。结果，基于ZS4的DSC在标准AM1.5G太阳光下实现了13.2%的功率转换效率（PCE），具有16.3 mA cm²的高短路光电流密度（Jsc）、1.05 V的开路电压（Voc）和77.1%的填充因子（FF）。值得注意的是，用ZS4敏化的DSC表现出出色的稳定性，在连续光照1000小时后仍保留其初始PCE的95%。据信，这是迄今为止使用单一光敏剂的基于铜电解质的DSC所报道的新的效率记录。这项工作突出了开发用于基于铜电解质的高效DSC的分子定制光敏剂的重要性。
