Polaronic Tunnelling in Organic Triblock Copolymers

作     者：刘德胜 张大成 解士杰 梅良模 

作者机构：SchoolofPhysicsandMicroelectronicsShandongUniversityJinan250100//DepartmentofPhysicsJiningNormalUniversityJining272025//NationalKeyLaboratoryofCrystalMaterialsShandongUniversityJinan250100 SchoolofPhysicsandMicroelectronicsShandongUniversityJinan250100//NationalKeyLaboratoryofCrystalMaterialsShandongUniversityJinan250100 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2005年第22卷第1期

页      面：178-181页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：国家自然科学基金 山东省自然科学基金 

主　　题：ELECTRONIC-STRUCTURE CONJUGATED POLYMERS BAND-GAP ELECTROLUMINESCENCE POLYACETYLENE OLIGOMERS STATES 

摘      要：Polaron tunnelling is studied in xPA/nPPP/xPA (PA for polyacetylene and PPPpoly (p-phenylene)) triblock copolymer, which has a well-barrier-well structure. An extendedtight-binding Hamiltonian including external electric held is adopted. Without electric field, theinjected electrons would not extend over the whole copolymer chain but instead be confined in thesegments of PA. This is different from the behaviour of the traditional semiconductors. It is foundthat the polaron can transfer to the potential barrier-PPP segment when the applied electric fieldreaches a certain value. The critical polaron tunnelling electric fields depend upon the lengths ofPPP segments.