渡线
凝聚态物理
放松(心理学)
半导体
有机半导体
电荷(物理)
载流子
对角线的
电场
物理
量子退相干
材料科学
量子
统计物理学
量子力学
社会心理学
几何学
计算机科学
人工智能
数学
心理学
作者
Jingjuan Dong,Chang-Qin Wu
摘要
We show a crossover from coherent to incoherent behavior of charge transport in crystalline organic semiconductors by considering the effect of shallow traps within the dynamical disorder model. The mixed quantum-classical system is treated by the Ehrenfest dynamics method complementing with instantaneous decoherence corrections and energy relaxation, which has been shown to properly make the system close to equilibrium. The shallow traps, which are incorporated by a static diagonal disorder, are shown to play a central role in the crossover. Temperature dependence of charge-carrier mobility is shown to be changed from being negative to positive with the strength of shallow traps increasing, which implies that there is a crossover from hopping to band-like transport. A higher electric field helps to recover the charge-carrier band-like transport behavior from the traps-caused hopping transport. In this way, a unified physical picture of the charge transport in crystalline organic semiconductors is proposed.
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