Efficient singlet exciton fission in pentacene prepared from a soluble precursor

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Publikace nespadá pod Filozofickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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TABACHNYK M. KARANI A.H. BROCH K. PAZOS-OUTON L.M. XIAO J. JELLICOE T.C. NOVÁK Jiří HARKIN D. PEARSON A.J. RAO A. GREENHAM N.C. BOHM M.L. FRIEND R.H.

Rok publikování 2016
Druh Článek v odborném periodiku
Časopis / Zdroj APL MATERIALS
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www Webová adresa publikace
Doi http://dx.doi.org/10.1063/1.4968518
Obor Fyzika pevných látek a magnetismus
Klíčová slova exciton fission; photovoltaics; organic semiconductors; pentacene; acenes solubility; FTIR; atomic force microscopy; X-ray diffraction; spin-cotaing; molecular beam deposition
Popis Carrier multiplication using singlet exciton fission ( SF) to generate a pair of spin-triplet excitons from a single optical excitation has been highlighted as a promising approach to boost the photocurrent in photovoltaics (PVs) thereby allowing PV operation beyond the Shockley-Queisser limit. The applicability of many efficient fission materials, however, is limited due to their poor solubility. For instance, while acene-based organics such as pentacene ( Pc) show high SF yields ( up to 200%), the plain acene backbone renders the organic molecule insoluble in common organic solvents. Previous approaches adding solubilizing side groups such as bis(tri-iso-propylsilylethynyl) to the Pc core resulted in low vertical carrier mobilities due to reduction of the transfer integrals via steric hindrance, which prevented high efficiencies in PVs. Here we show how to achieve good solubility while retaining the advantages of molecular Pc by using a soluble precursor route. The precursor fully converts into molecular Pc through thermal removal of the solubilizing side groups upon annealing above 150 degrees C in the solid state. The annealed precursor shows small differences in the crystallinity compared to evaporated thin films of Pc, indicating that the Pc adopts the bulk rather than surface polytype. Furthermore, we identify identical SF properties such as sub-100 fs fission time and equally long triplet lifetimes in both samples. (C) 2016 Author(s).
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