Novel Dual BODIPY-Carbazole Conjugates with Various Linkers
作者:Qiao Zong、Hongbin Zhao、Weinan Zhou、Wentao Zhang、Junxu Liao、Nianfa Yang
DOI:10.1071/ch16704
日期:——
geometry, exhibit broader and red-shifted absorption with an obvious charge transfer shoulder peak, as well as red-shifted emission. UV-visible absorption spectroscopy and cyclic voltammetry results show that the extension of the π-conjugated system leads to a reduction in the optical gap with a decrease of the LUMO level. All conjugates display remarkable Stokes shifts (107–216 nm) and low fluorescence
The synthesis and photovoltaic properties of A–D–A-type small molecules containing diketopyrrolopyrrole terminal units
作者:Ling Zhang、Shaohang Zeng、Lunxiang Yin、Changyan Ji、Kechang Li、Yanqin Li、Yue Wang
DOI:10.1039/c2nj40963a
日期:——
A series of novel AâDâA structured small molecule photovoltaic (PV) materials [CZ(TDPP)2, DPA(TDPP)2, PTZ(TDPP)2 and FL(TDPP)2] with diketopyrrolopyrrole (DPP) as an electron-withdrawing group were synthesized and characterized. These small molecular donors exhibit excellent solubility in common organic solvents. The density functional theory (DFT) calculations demonstrated the intramolecular charge transfer (ICT) behavior of the synthesized PV materials and an efficient charge separation was observed by a fluorescence quenching experiment. In addition, their photophysical and electrochemical properties show that they harvest sunlight over the entire visible spectrum range and keep appropriate energy levels to satisfy the requirement of solution-processable OSCs. Therefore, we explored the PV properties of the synthesized donors by fabricating BHJ solar cells with a typical structure of ITO/PEDOT:PSS/Donors:PC61BM/LiF/Al. Among them, CZ(TDPP)2 revealed a promising performance in PV devices with a power conversion efficiency (PCE) of 1.50%, along with an open-circuit voltage (VOC) of 0.66 V, a short-circuit current density (JSC) of 4.12 mA cmâ2, and a fill factor (FF) of 0.44, under an illumination of AM 1.5G (80 mW cmâ2).
合成并表征了一系列新型A–D–A结构的小分子光伏材料[CZ(TDPP)2、DPA(TDPP)2、PTZ(TDPP)2和FL(TDPP)2],其中二氟吡咯吡咯(DPP)作为电子吸收基团。这些小分子供体在常见有机溶剂中表现出优异的溶解性。密度泛函理论(DFT)计算展示了合成的光伏材料的分子内电荷转移(ICT)行为,通过荧光猝灭实验观察到了高效的电荷分离。此外,它们的光物理和电化学特性表明,这些材料能够在整个可见光谱范围内利用阳光,并保持合适的能级,以满足可溶液加工有机太阳能电池(OSCs)的要求。因此,我们通过构建具有典型结构的BHJ太阳能电池(ITO/PEDOT:PSS/供体:PC61BM/LiF/Al)来探讨合成的供体的光伏性质。其中,CZ(TDPP)2在光伏器件中表现出良好的性能,功率转换效率(PCE)为1.50%,开路电压(VOC)为0.66 V,短路电流密度(JSC)为4.12 mA cm⁻²,填充因子(FF)为0.44,在AM 1.5G(80 mW cm⁻²)照射下测得。
Anchoring stability and photovoltaic properties of new D(-π-A)2 dyes for dye-sensitized solar cell applications
作者:Roberto Grisorio、Luisa De Marco、Giovanni Allegretta、Roberto Giannuzzi、Gian Paolo Suranna、Michele Manca、Piero Mastrorilli、Giuseppe Gigli
DOI:10.1016/j.dyepig.2013.02.012
日期:2013.8
This study deals with the synthesis and characterization of two new di-anchoring dyes for applications in dye-sensitized solar cells. The materials were designed with a branched D(-π-A)2 structure containing (i) a rigid alkyl-functionalized carbazole core as the donor part, (ii) one (DYE1) or two (DYE2) thiophene units as the π-bridge and (iii) a cyano-acrylic moiety as acceptor and anchoring part
这项研究涉及用于染料敏化太阳能电池的两种新型双锚定染料的合成和表征。设计的材料具有支化的D(-π-A)2结构,该结构包含(i)刚性烷基官能化的咔唑核作为供体部分,(ii)一个(DYE1)或两个(DYE2)噻吩单元作为π-桥和(iii)氰基-丙烯酸部分作为受体和锚定部分。电化学阻抗谱表明,在DYE2的情况下,注入的电子寿命更长,这可能是由于π-间隔物的长度与结合在咔唑单元上的烷基链一起阻碍了电荷与电解质的重组。TiO 2的稳定性测试敏化膜显示,双锚定作用显着减慢了解吸过程,这对于经典的参考染料而言是明显的。IPYE测量也证实,在DYE2的情况下,光电压为0.70 V,光电流为10.52 mA cm -2时,最高功率转换效率达到5.01%。这些结果支持旨在D(-π-A)2染料的结构工程,以设计新的,更有效和稳定的有机敏化剂的努力。
Bis(<i>tert</i>-butylpyrene) Nanotweezers and Nanocalipers: Enhanced Extraction and Recognition Abilities for Single-Walled Carbon Nanotubes
作者:Gang Liu、A. F. M. Mustafizur Rahman、Songpol Chaunchaiyakul、Takahide Kimura、Yuji Kuwahara、Naoki Komatsu
DOI:10.1002/chem.201302799
日期:2013.11.25
substituent at the 7′‐position of 2‐pyrene is found to enhance the extraction and recognitionabilities of dipyrene nanotweezers and nanocalipers. That is, (6,5)‐SWNTs were obtained in high purity by use of bis(tert‐butylpyrene) nanotweezers with a phenanthrene spacer and metallic SWNTs were highly enriched by use of bis(tert‐butylpyrene) nanocalipers with a carbazole–anthracene–carbazole spacer.
Periphery Fusion Strategy of a Carbazole‐Based Macrocycle toward Coplanar N‐Heterocycloarene for High‐Mobility Single‐Crystal Transistors
作者:Ning Zhang、Wenhao Li、Jiangyu Zhu、Teng Wang、Rong Zhang、Kai Chi、Yunqi Liu、Yan Zhao、Xuefeng Lu
DOI:10.1002/adma.202300094
日期:——
corresponding single-bond-linked carbazole-based macrocycle M-C4, it is found that the periphery fusion strategy greatly changes the electronic structures, energy levels, photophysical properties, host–guest interactions with fullerenes, and molecular crystal stacking motifs. In particular, the fully fused N-heterocycloarene FM-C4 exhibits a herringbone packing structure with an unusual long-range π−π overlap
通过修改有机半导体的 π 拓扑和分子堆积来设计(杂)环芳烃最近引起了相当大的关注。然而,它们在场效应晶体管中作为有机活性层的应用非常有限,得到的空穴载流子迁移率小于1 cm 2 V -1 s -1. 在这项工作中,成功合成了一种含有四个咔唑单元的新型烷基取代共面 N-杂环芳烃 (FM-C4) 的结晶形式。与相应的单键连接的基于咔唑的大环化合物 M-C4 相比,发现外围聚变策略极大地改变了电子结构、能级、光物理性质、与富勒烯的主客体相互作用以及分子晶体堆叠图案. 特别是,完全稠合的 N-杂环芳烃 FM-C4 表现出人字形堆积结构,具有不寻常的长程 π-π 重叠距离低至 3.19 Å,而 M-C4 的单晶则没有 π-π 相互作用。因此,单晶晶体管中的 FM-C4 显示出 2.06 cm 2 V -1 s的最高空穴迁移率-1,显着优于 M-C4 和所有报道的(杂)环芳烃,并表明(杂)环芳烃在有机电子应用中的巨大潜力。