Influence of side chain length and bifurcation point on the crystalline structure and charge transport of diketopyrrolopyrrole-quaterthiophene copolymers (PDQTs)
作者:Shaoyun Chen、Bin Sun、Wei Hong、Hany Aziz、Yuezhong Meng、Yuning Li
DOI:10.1039/c3tc32219j
日期:——
Increasing the side chain length and positioning the bifurcation point away from the polymer backbone improve the hole mobility of a DPP polymer to 6.90 cm2 V−1 s−1.
The introduction of quinoidal character to pi-conjugated polymers is one of the effective approaches to reducing the bandgap. Here we synthesized new pi-conjugated polymers (PBTD4T and PBDTD4T) incorporating thienoquinoids 2,2'-bithiophene-5,5'-dione (BTD) and benzo[1,2-b:4,5-b']-dithiophene-2,6-dione (BDTD) as strong electron-deficient (acceptor) units. PBTD4T showed a deep LUMO energy level of -3.77 eV and a small bandgap of 1.28 eV, which are similar to those of the analog using thieno[3,2-b]thiophene-2,5-dione (TTD) (PTTD4T). PBDTD4T had a much deeper LUMO energy level of -4.04 eV and a significantly smaller bandgap of 0.88 eV compared to those of the other two polymers. Interestingly, PBDTD4T showed high transparency in the visible region. The very small bandgap of PBDTD4T can be rationalized by the enhanced contribution of the resonance backbone structure in which the p-benzoquinodimethane skeleton in the BDTD unit plays a crucial role. PBTD4T and PBDTD4T exhibited ambipolar charge transport with more balanced mobilities between the hole and the electron than PTTD4T. We believe that the very small bandgap, i.e., the high near-infrared activity, as well as the well-balanced ambipolar property of the pi-conjugated polymers based on these units would be of particular interest in the fabrication of next-generation organic devices.
Use of an additive for fuel
申请人:Kao Corporation
公开号:EP0353713B1
公开(公告)日:1994-03-16
US5298038A
申请人:——
公开号:US5298038A
公开(公告)日:1994-03-29
[EN] MONOMERIC, OLIGOMERIC AND POLYMERIC SEMICONDUCTORS CONTAINING FUSED RINGS AND THEIR DEVICES<br/>[FR] SEMI-CONDUCTEURS MONOMÈRES, OLIGOMÈRES ET POLYMÈRES CONTENANT DES CYCLES FUSIONNÉS ET LEURS DISPOSITIFS
申请人:LI YUNING
公开号:WO2014071524A1
公开(公告)日:2014-05-15
The present invention describes monomeric, oligomeric and polymeric materials comprising a fused-ring moiety (I), which can be used as organic semiconductors for use in electronic, optical, or optoelectronic devices such as organic thin film transistors and organic photovoltaics.