Singlet exciton fission in a modified acene with improved stability and high photoluminescence yield

Autor: Jesse R. Allardice, Peter Budden, Naitik A. Panjwani, Richard H. Friend, Michael Ganschow, Simon Dowland, Jan Freudenberg, Matthias Müller, Uwe H. F. Bunz, Leah R. Weiss, Jan Behrends
Přispěvatelé: Budden, Peter J [0000-0002-8049-3401], Panjwani, Naitik A [0000-0002-2913-5377], Behrends, Jan [0000-0003-1024-428X], Friend, Richard H [0000-0001-6565-6308], Apollo - University of Cambridge Repository, Budden, Peter J. [0000-0002-8049-3401], Panjwani, Naitik A. [0000-0002-2913-5377], Friend, Richard H. [0000-0001-6565-6308]
Rok vydání: 2021
Předmět:
Solar cells
639/301/119/998
Photoluminescence
Materials science
144
Fission
Science
Molecular electronics
Exciton
Population
General Physics and Astronomy
02 engineering and technology
010402 general chemistry
01 natural sciences
5108 Quantum Physics
Article
General Biochemistry
Genetics and Molecular Biology
Condensed Matter::Materials Science
chemistry.chemical_compound
Magnetic properties and materials
128
Singlet state
140/125
education
Acene
education.field_of_study
132
Multidisciplinary
34 Chemical Sciences
500 Naturwissenschaften und Mathematik::570 Biowissenschaften
Biologie::570 Biowissenschaften
Biologie
General Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Tetracene
639/301/299/946
chemistry
Chemical physics
Singlet fission
0210 nano-technology
51 Physical Sciences
639/766/119/997
Zdroj: Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021)
Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-021-21719-x
Popis: We report a fully efficient singlet exciton fission material with high ambient chemical stability. 10,21-Bis(triisopropylsilylethynyl)tetrabenzo[a,c,l,n]pentacene (TTBP) combines an acene core with triphenylene wings that protect the formal pentacene from chemical degradation. The electronic energy levels position singlet exciton fission to be endothermic, similar to tetracene despite the triphenylenes. TTBP exhibits rapid early time singlet fission with quantitative yield of triplet pairs within 100 ps followed by thermally activated separation to free triplet excitons over 65 ns. TTBP exhibits high photoluminescence quantum efficiency, close to 100% when dilute and 20% for solid films, arising from triplet-triplet annihilation. In using such a system for exciton multiplication in a solar cell, maximum thermodynamic performance requires radiative decay of the triplet population, observed here as emission from the singlet formed by recombination of triplet pairs. Combining chemical stabilisation with efficient endothermic fission provides a promising avenue towards singlet fission materials for use in photovoltaics.
Designing optimised molecules for singlet fission is crucial to improve the efficiency of solar cells beyond its theoretical limit. Here, the authors investigate pentacene derivative TTBP, which exhibits high stability and luminescence yield, and find it highly suitable for exciton multiplication purposes.
Databáze: OpenAIRE
Externí odkaz: