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Designing small molecule organic solar cells with high open-circuit voltage

Tijdschriftbijdrage - Tijdschriftartikel

Three extended 2,5-dithienylthiazolo[5,4-d] thiazole-based small molecule chromophores are prepared via a sustainable direct arylation approach and their physicochemical and opto-electrical material characteristics are analyzed toward integration in solution-processed bulk heterojunction organic photo-voltaics. Efficient charge separation and high values of the charge transfer state energy are derived from sensitive ground and excited state absorption and photoluminescence measurements on blends of the thiazolo[5,4-d] thiazole-based electron donor components with the PC71BM fullerene acceptor. Upon implementation in organic solar cells, a maximum power conversion efficiency of 2.7% and particularly high open-circuit voltages (0.93 - 0.98 V) are observed, which are correlated to the charge transfer state energies as derived from photoluminescence, Fourier transform photocurrent spectroscopy and combined electrochemical and photophysical data. Furthermore, several loss processes at the origin of the modest short-circuit current densities and fill factors are elucidated.
Tijdschrift: ChemistrySelect
ISSN: 2365-6549
Volume: 2
Pagina's: 1253 - 1261
Jaar van publicatie:2017
Trefwoorden:A1 Journal article
BOF-keylabel:ja
BOF-publication weight:1
CSS-citation score:1
Auteurs:International
Authors from:Government
Toegankelijkheid:Closed