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Subgap Absorption in Organic Semiconductors

Nasim Zarrabi, Oskar Sandberg Orcid Logo, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

The Journal of Physical Chemistry Letters, Volume: 14, Issue: 13, Pages: 3174 - 3185

Swansea University Authors: Nasim Zarrabi, Oskar Sandberg Orcid Logo, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

Abstract

Organic semiconductors have found a broad range of application in areas such as light emission, photovoltaics, and optoelectronics. The active components in such devices are based on molecular and polymeric organic semiconductors, where the density of states is generally determined by the disordered...

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Published in: The Journal of Physical Chemistry Letters
ISSN: 1948-7185 1948-7185
Published: American Chemical Society (ACS) 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa62804
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Abstract: Organic semiconductors have found a broad range of application in areas such as light emission, photovoltaics, and optoelectronics. The active components in such devices are based on molecular and polymeric organic semiconductors, where the density of states is generally determined by the disordered nature of the molecular solid rather than energy bands. Inevitably, there exist states within the energy gap which may include tail states, deep traps caused by unavoidable impurities and defects, as well as intermolecular states due to (radiative) charge transfer states. In this Perspective, we first summarize methods to determine the absorption features due to the subgap states. We then explain how subgap states can be parametrized based upon the subgap spectral line shapes. We finally describe the role of subgap states in the performance metrics of organic semiconductor devices from a thermodynamic viewpoint.
College: Faculty of Science and Engineering
Funders: Llywodraeth Cymru; Swansea University; European Regional Development Fund
Issue: 13
Start Page: 3174
End Page: 3185