Dyes and Pigments ( IF 4.1 ) Pub Date : 2017-10-12 , DOI: 10.1016/j.dyepig.2017.10.011
Sung Ho Kang , Seung Young Jung , Yeon Wook Kim , Yu Kyung Eom , Hwan Kyu Kim
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The design and synthesis of D–π–A structured Zn(II)–porphyrin sensitizers with extended π-conjugation, coded as SGT-012, SGT-016, SGT-052 and SGT-053, were explored. The key schematic concept for the molecular design and synthesis of porphyrin sensitizers, with the target of modulation of donor groups by embedding an electron donor into the skeleton of two typical D‐π‐A porphyrin models, such as D–porphyrin-A sensitizers (SGT-012 and SGT-016) and D-triple bond-porphyrin-triple bond-BTD-acceptor sensitizers (SGT-052 and SGT-053), was proposed investigate the influence of the donor ability and the bulk of donor groups on the photophysical properties and cell performance of dye-sensitized solar cells (DSSCs). Also, based on the photophysical properties and cell performances, the co-sensitisation strategy was conducted to further enhance the cell performances. SGT-012 and SGT-052 porphyrins, containing a strong donor unit, exhibited similar S-band absorption and a slightly red-shifted Q-band absorption compared to SGT-016 and SGT-053 porphyrins containing a weak bulky donor unit, respectively. To further extend the π-conjugation and absorption to a longer wavelength range, the triple bond at two meso-positions of the porphyrin core and a benzothiadiazole (BTD) strong electron acceptor was introduced to yield SGT-052 and SGT-053, resulting in a red-shift and broad visible region absorption ability. It was indicated that these modifications lead to the formation of a stronger intramolecular charge transfer complex, which is favourable for harvesting sunlight, than those of SGT-012 and SGT-016 porphyrins. To prevent undesirably reduced Voc caused by charge recombination processes and dye aggregation from porphyrin-sensitized solar cells, HC-Al of co-adsorbent was adopted to fabricate SGT-052- and SGT-053-based solar cells. The DSSCs with SGT-052 and SGT-053 exhibit better light harvesting ability than the DSSCs with SGT-012 and SGT-016 porphyrins, due to the formation of the stronger intramolecular charge transfer complex. Thus, the incident photon-to-current conversion efficiency (IPCE) of SGT-052 and SGT-053-based DSSCs was extremely red-shifted to a wavelength of 800 nm, resulting in higher Jsc values of 15.3 and 14.6 mA cm−2, respectively. The DSSC utilising SGT-052 and HC-A1 exhibited a higher photovoltaic performance (ηeff ∼9.6%) than did other sensitizers. On the basis of SGT-052-based DSSC, its DSSCs co-sensitized with SGT-012 were prepared to improve the Jsc, Voc and power conversion efficiency (10.2%).
中文翻译:
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用于染料敏化太阳能电池的D–π–A结构化锌卟啉的探索性合成和光伏性能比较
探索了扩展π共轭的D-π-A结构化Zn(II)-卟啉敏化剂的设计与合成,其编码为SGT-012,SGT-016,SGT-052和SGT-053。卟啉敏化剂分子设计和合成的关键原理图概念,其目标是通过将电子供体嵌入两个典型的D-π-A卟啉模型(例如D-卟啉-A敏化剂)的骨架中来调节供体基团(SGT-012和SGT-016)和d-三键卟啉-三重成键BTD端受体敏化剂(SGT-052和SGT-053),建议研究供体能力和大量供体基团对染料敏化太阳能电池(DSSC)的光物理性质和电池性能的影响。另外,基于光物理性质和细胞性能,进行了共敏化策略以进一步增强细胞性能。与具有弱大供体单元的SGT-016和SGT-053卟啉相比,含有强供体单元的SGT-012和SGT-052卟啉分别表现出相似的S波段吸收和Q带吸收。为了进一步将π共轭和吸收扩展到更长的波长范围,两个内消旋体的三键引入卟啉核的中心位置和苯并噻二唑(BTD)强电子受体,产生SGT-052和SGT-053,从而产生红移和宽可见区吸收能力。已经表明,与SGT-012和SGT-016卟啉的那些相比,这些修饰导致形成更强的分子内电荷转移复合物,其对于收获阳光是有利的。为了防止由于电荷重组过程和卟啉敏化太阳能电池中的染料聚集而导致的V oc降低,采用共吸附剂的HC-Al制备SGT-052-和SGT-053太阳能电池。具有SGT-052和SGT-053的DSSC与具有SGT-012和SGT-016卟啉的DSSC相比,由于形成了更强的分子内电荷转移复合物,因此具有更好的光收集能力。因此,入射光子-电流转换效率(IPCE)的SGT-052和SGT-053系DSSC中受到极大红移至800nm的波长,从而导致更高Ĵ SC的15.3和14.6毫安厘米值- 2,分别。利用SGT-052和HC-A1的DSSC表现出更高的光伏性能(ηEFF ~9.6%)比没有其他的增敏剂。在基于SGT-052的DSSC的基础上,制备了与SGT-012共敏化的DSSC,以提高J sc, V oc和功率转换效率(10.2%)。