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Updated: Jun 1, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Band dispersion and electronic lifetimes in crystalline organic semiconductors
1Istituto dei Sistemi Complessi CNR, CNISM and Dipartimento di Fisica, Università dell'Aquila, Coppito-L'Aquila, Italy.
Abstract:
The consequences of several microscopic interactions on the photoemission spectra of crystalline organic semiconductors are studied theoretically. It is argued that their relative roles can be disentangled by analyzing both their temperature and their momentum-energy dependence. Our analysis shows that the polaronic thermal band narrowing, which is the foundation of most theories of electrical transport in organic semiconductors, is inconsistent in the range of microscopic parameters appropriate for these materials. An alternative scenario is proposed to explain the experimental trends.
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