需要具有高电导率的掺杂小分子,因为它们通常显示出比聚合物对应物更大的塞贝克系数和更低的热导率。然而,与共轭聚合物相比,只有少数小分子可以表现出高导电性。在这项研究中,合成了三种具有不同末端官能团的 n 型小分子有机半导体,以探索 n 掺杂小分子半导体中低电导率问题的原因。电荷载流子迁移率和掺杂水平通常被认为是实现高电导率的两个主要参数。具有0.77 cm 2 V -1 s -1的高电子迁移率的TDPP-ThIC高电子亲和性,可以很容易地进行n型掺杂;然而,它仅显示出≈10 -3 S cm -1的电导率。为了探究原因,我们仔细分析了TDPP-ThIC的单晶结构及其n掺杂薄膜的掠入射广角X射线散射。具有一维柱填料的 TDPP-ThIC 被公开,并且很容易被增强的 n 型掺杂剂扭曲,这会破坏电荷传输路径,从而导致低电导率。结果表明,只有高本征载流子迁移率和高掺杂水平并不能保证高导电性,掺杂后保持良好的电荷传输路径也很关键。
Conjugated molecules with low lying LUMO levels are demanding for the development of air stablen‐type organic semiconductors. In this paper, we report a new A‐D‐A′‐D‐A conjugated molecule (DAPDCV) entailing diazapentalene (DAP) and dicyanovinylene groups as electronaccepting units. Both theoretical and electrochemical studies manifest that the incorporation of DAP unit in the conjugated molecule
申请人:The Board of Trustees of the Leland Stanford Junior University of the General Counsel
公开号:US10889499B2
公开(公告)日:2021-01-12
A polymer comprising at least one unit of the formula (1) wherein T1 is a carbon atom or a nitrogen atom, T2 is a carbon atom if T1 is a nitrogen atom, or is a nitrogen atom if T1 is a carbon atom, r is 1, 2, 3 or 4, s is 1, 2, 3, or 4, M1 is preferably selected from the group consisting of M2 is preferably The polymers are prepared by reacting monomers (1a) with monomers (2a) H2N-[-M1-]r-NH2 (1a) OHC-[-M2-]s-CHO (2a) or the step of reacting monomers (1b) with monomers (2b) OHC-[-M1-]r-CHO (1b) H2N-[-M2-]s-NH2 (2b).