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CC BY-NC-ND 4.0 · Organic Materials 2022; 4(04): 163-169
DOI: 10.1055/a-1939-6110
Supramolecular Chemistry
Short Communication

Bending Pyrenacenes to Fill Gaps in Singlet-Fission-Based Solar Cells

Carlos M. Cruz 
a   Department of Organic Chemistry, Faculty of Sciences, University of Granada, Unidad de Excelencia de Química (UEQ), Avda. Fuente Nueva s/n, ES-18071, Granada, Spain
b   Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
,
Joshua C. Walsh 
b   Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
,
Michal Juríček 
b   Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
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Dedicated to Graham J. Bodwell on the occasion of his 60th birthday.

Abstract

Singlet fission is envisaged to enhance the efficiency of single-junction solar cells beyond the current theoretical limit. Even though sensitizers that undergo singlet fission efficiently are known, characteristics like low-energy triplet state or insufficient stability restrict their use in silicon-based solar cells. Pyrenacenes have the potential to overcome these limitations, but singlet-fission processes in these materials is outcompeted by excimer formation. In this work, bent pyrenacenes with a reduced propensity to stack and thus form excimers are computationally evaluated as singlet-fission materials. The energies of the S1, T1 and T2 states were estimated in a series of bent pyrenacenes by means of time-dependent density functional theory calculations. Our results show the opposite trend observed for perylene diimides, namely, an increase in the energy of the T1 and S1 states upon bending. In addition, we show that the energy levels can be tuned on demand by manipulating the bend angle to match the energy gap of various semiconductors that can be used in single-junction solar cells, making pyrenacenes promising candidates for singlet fission.

Key words

bent polycyclic aromatic hydrocarbons - density functional theory - pyrenacenes - ropyrenes - rylene diimides - singlet fission

Supporting Information



Publikationsverlauf

Eingereicht: 15. Juli 2022

Angenommen nach Revision: 05. September 2022

Accepted Manuscript online:
08. September 2022

Artikel online veröffentlicht:
26. Oktober 2022

© 2022. The authors. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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