[EN] LIQUID CRYSTALLINE MEDIUM<br/>[FR] MILIEU CRISTALLIN LIQUIDE
申请人:MERCK PATENT GMBH
公开号:WO2019243216A1
公开(公告)日:2019-12-26
The present invention relates to a liquid crystalline medium comprising dichroitic dyes made of benzothiadiazoles and related extended heterocyclic derivatives, the use of said medium for optical, electro-optical and electronic purposes, in particular in devices for regulating the passage of radiation energy from an outside space into an inside space, for example in windows. The invention further relates to devices containing the liquid crystalline medium according to the invention. Some new dichroitic dyes are disclosed.
Thieno[3,2-b]thiophene-substituted benzodithiophene in donor-acceptor type semiconducting copolymers: A feasible approach to improve performances of organic photovoltaic cells
作者:Ji-Hoon Kim、Hee Su Kim、Jong Baek Park、In-Nam Kang、Do-Hoon Hwang
DOI:10.1002/pola.27431
日期:2014.12.15
Thieno[3,2‐b]thiophene‐substituted benzo[1,2‐b:4,5‐b′]dithiophene donor units (TTBDT) serve as novel promisingbuildingblocks for donor–acceptor (D‐A) copolymers in organic photovoltaic cells. In this study, a new D‐A type copolymer (PTTBDT‐TPD) consisting of TTBDT and thieno[3,4‐c]pyrrole‐4,6‐dione (TPD) is synthesized by Stille coupling polymerization. A PTTBDT‐TPD analog consisting of TTBDT and
The effect of thieno[3,2-b]thiophene on the absorption, charge mobility and photovoltaic performance of diketopyrrolopyrrole-based low bandgap conjugated polymers
作者:Yongxi Li、Chih-Yu Chang、Yu Chen、Yi Song、Chang-Zhi Li、Hin-Lap Yip、Alex K.-Y. Jen、Chao Li
DOI:10.1039/c3tc31600a
日期:——
two-dimensional diketopyrrolopyrrole-based low band gap conjugated polymers were synthesized. Replacing thiophene with thieno[3,2-b]thiophene in the side chain and bridge resulted in significant changes to the optical, electrochemical, and morphological properties of the polymers, as well as the subsequent performance of devices made from these materials. The polymer with thieno[3,2-b]thiophene as a bridge
合成了一系列的二维基于二酮吡咯并吡咯的低带隙共轭聚合物。在侧链和桥中用噻吩并[3,2- b ]噻吩取代噻吩导致聚合物的光学,电化学和形态学性质发生显着变化,以及由这些材料制成的装置的后续性能。以噻吩并[3,2- b ]噻吩为桥基而不是侧链的聚合物表现出增加的吸收系数和空穴迁移率,并导致该系列聚合物中最高的功率转换效率(5.34%)。这一发现为开发更有效的低带隙聚合物提供了宝贵的见识。
Thieno[3,2-<i>b</i>]thiophene-Substituted Benzo[1,2-<i>b</i>:4,5-<i>b</i>′]dithiophene as a Promising Building Block for Low Bandgap Semiconducting Polymers for High-Performance Single and Tandem Organic Photovoltaic Cells
We designed and synthetized a new poly4,8-bis((2-ethylhexyl)thieno[3,2-b]thiophene)-benzo[1,2-b:4,5-b']dithiophene-alt-2-ethylhexyl-4,6-di- bromo-3-fluorothieno[3,4-b]thiophene-2-carboxylate} (PTTBDT-FTT) comprising bis(2-ethylhexylthieno[3,2-b]thiophenylbenzo[1,2-b:4,5-b']dithiophene (TTBDT) and 2-ethylhexyl 3-fluorothieno[3,4-b]thiophene-2-carboxylate (FTT). The optical bandgap of PTTBDT-FTT was 1.55 eV. The energy levels of the highest occupied and lowest unoccupied molecular orbitals of PTTBDT-FTT were -5.31 and -3.73 eV, respectively. Two-dimensional grazing-incidence X-ray scattering measurements showed that the film's PTTBDT-FTT chains are predominantly arranged with a face-on orientation with respect to the substrate, with strong pi-pi stacking. An organic thin-film transistor fabricated using PTTBDT-FTT as the active semiconductor showed high hole mobility of 2.1 x 10(-2) cm(2)/(V.s). Single-junction bulk heterojunction photovoltaic cells with the configuration ITO/PEDOT:PSS/PTTBDT-FTT:PC71BM/Ca/Al were fabricated, which showed a maximum power conversion efficiency (PCE) of 7.44%. Inverted photovoltaic cells with the structure ITO/PEIE/PTTBDT-FTT:PC71/BM/MoO3/Ag were also fabricated, with a maximum PCE of 7.71%. A tandem photovoltaic device comprising the inverted PTTBDT-FTT:PC71BM cell and a P3HT:ICBA-based cell as the top and bottom cell components, respectively, showed a maximum PCE of 8.66%. This work demonstrated that the newly developed PTTBDT-FTT polymer was very promising for applications in both single and tandem solar cells. Furthermore, this work highlighted the fact that an extended pi-system in the electron-donor moiety in low bandgap polymers is crucial for improving polymer solar cells.