Zhou Haoran, Ji Jung-Min, Lee Hyun Seok, Aftabuzzaman Mohammad, Lee Dong-Nam, Kim Chul Hoon, Kim Hwan Kyu
Global GET-Future Lab. and Department of Advanced Materials Chemistry, Korea University, Sejong 339-700, Korea.
Renewable Energy Materials Laboratory (REML), Advanced Institute of Convergence Technology, Seoul National University, Suwon 16229, Korea.
ACS Appl Mater Interfaces. 2023 Aug 23;15(33):39426-39434. doi: 10.1021/acsami.3c08877. Epub 2023 Aug 14.
This study aimed to develop low-cost D-π-A structured porphyrin and organic dyes with easily synthesizable donor units instead of the conventional complex multistep synthetic donor unit of [bis(7-(2,4-bis(hexyloxy)phenyl)-9,9-dimethyl-9H-fluoren-2-yl)amine] used in and as well-known record cosensitizers with an extremely high power conversion efficiency (PCE). The design strategy concerned the easier synthesis of low-cost donor units with inversion structures in donor groups via donor structural engineering, particularly by changing the position of the fluorene and phenylene units in the donor moiety while keeping the π-bridge and acceptor unit unchanged, leading to the synthesis of two D-π-A structured porphyrins [ and ] and one D-π-A structured organic sensitizer [] for dye-sensitized solar cells (DSSCs). Specifically, porphyrin incorporated two hexyl chains into the 9-position of each fluorene, while and substituted two hexyloxy chain units to the terminal position of each fluorene in the donor groups of porphyrin dyes. The effect of the position of the fluorene and phenylene units in the donor moiety on the photochemical and electrochemical properties, as well as the photovoltaic performance, was compared with the reference dyes of and , previously reported by the research group. After optimizing the DSSC devices, and achieved a high PCE of 11.6 and 10.5%, respectively, while exhibited a little lower PCE of 10.3% under the standard AM 1.5G light intensity. The cell performance of DSSC devices based on and was inferior to the corresponding reference dyes of and due to their lower donating ability of than .
本研究旨在开发低成本的D-π-A结构卟啉和有机染料，其具有易于合成的供体单元，而非传统的复杂多步合成供体单元[双(7-(2,4-双(己氧基)苯基)-9,9-二甲基-9H-芴-2-基)胺]，后者在[文献]和[文献]中用作具有极高功率转换效率(PCE)的著名共敏化剂。设计策略涉及通过供体结构工程更容易地合成供体基团中具有反演结构的低成本供体单元，特别是通过改变芴和亚苯基单元在供体部分中的位置，同时保持π桥和受体单元不变，从而合成两种用于染料敏化太阳能电池(DSSC)的D-π-A结构卟啉[和]以及一种D-π-A结构有机敏化剂[]。具体而言，卟啉在每个芴的9位引入两条己基链，而[另一种卟啉]和[有机敏化剂]在卟啉染料供体基团中每个芴的末端位置取代两个己氧基链单元。将供体部分中芴和亚苯基单元的位置对光化学和电化学性质以及光伏性能的影响与该研究小组先前报道的[两种]参考染料进行了比较。在优化DSSC器件后，[一种卟啉]和[另一种卟啉]分别实现了11.6%和10.5%的高PCE，而[有机敏化剂]在标准AM 1.5G光强下表现出略低的10.3%的PCE。基于[有机敏化剂]和[一种卟啉]的DSSC器件的电池性能低于相应的[两种]参考染料，因为其[供体]的给电子能力低于[参考染料的供体]。
