From synthesis to device fabrication: elucidating the structural and electronic properties of C7-BTBT-C7

We report the polymorph investigation, crystallographic study and fabrication of organic field-effect transistors (OFETs) in solution-processed thin films of a prototypical organic semiconductor, i.e., 2,7-diheptylbenzo[b]benzo[4,5]thieno[2,3-d]thiophene (C7-BTBT-C7). We found that this molecule sel...

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Detalles Bibliográficos
Autores: Pandey, Priya, Fijahi, Lamiaa, McIntosh, Nemo, Turetta, Nicholas, Bardini, Marco, Giannini, Samuele, Ruzié, Christian, Schweicher, Guillaume, Beljonne, David, Cornil, Jérôme, Samorì, Paolo, Mas Torrent, Marta, Geerts, Yves Henri, Modena, Enrico, Maini, Lucia
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/334592
Acceso en línea:http://hdl.handle.net/10261/334592
https://api.elsevier.com/content/abstract/scopus_id/85160548395
Access Level:acceso abierto
Palabra clave:Field-effect transistors
Charge-carrier mobility
Organic semiconductors
Liquid-crystals
Descripción
Sumario:We report the polymorph investigation, crystallographic study and fabrication of organic field-effect transistors (OFETs) in solution-processed thin films of a prototypical organic semiconductor, i.e., 2,7-diheptylbenzo[b]benzo[4,5]thieno[2,3-d]thiophene (C7-BTBT-C7). We found that this molecule self-assembles solely into one type of stable crystal form, regardless of the experimental conditions employed when using conventional and non-conventional methods of crystallization. The integration of blends of C7-BTBT-C7 with polystyrene as active materials in OFETs fabricated using a solution shearing technique led to a field-effect mobility of 1.42 ± 0.45 cm2 V−1 s−1 in the saturation regime when a coating speed of 10 mm s−1 was employed. The intrinsic structural properties control the overlap of the frontier orbitals, thereby affecting the device performance. The interplay between the crystal packing, thin film morphology and uniformity and its impact on the device performance are reported.

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