Conjugation effects on carrier mobilities of polythiophenes probed by time-resolved terahertz spectroscopy

Date

2008-07-24

Author

Esentürk, Okan
Deongchamp, Dean M.
Heilweil, Edwin J.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

147
views

0
downloads

Optically generated carrier conductivity of thiophene-based spin-cast polymer films, as cast poly(3-hexylthiophene) (P3HT) and both as cast and above liquid crystalline temperature annealed poly(2,5-bis(3tetradecylthiophen-2yl)thieno[3,2-b]thiophene) (PBTTT), were measured by time-resolved THz spectroscopy (TRTS) and compared to reported thin-film transistor (TFT) device measurements. The relative mobilities of the samples measured by TRTS agree well with reported TFl` mobilities. Since TRTS is sensitive to shortrange carrier mobility, this study suggests that increased mobility of PBTTT relative to P3HT films arises from improved ordering of the local structure, increased effective conjugation length, and planarity of PBTTT molecules in the solid state.

Subject Keywords

General Energy, Physical and Theoretical Chemistry, Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films

URI

https://hdl.handle.net/11511/39384

Journal

JOURNAL OF PHYSICAL CHEMISTRY C

DOI

https://doi.org/10.1021/jp802700y

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Interaction of BrPDI, BrGly, and BrAsp with the Rutile TiO2(110) Surface for Photovoltaic and Photocatalytic Applications: A First-Principles Study Cakir, D.; GÜLSEREN, Oğuz; METE, ERSEN; Ellialtıoğlu, Süleyman Şinasi (American Chemical Society (ACS), 2011-05-12) The adsorption of perylenediimide (PDI)-based dye compounds (BrPDI, BrGly, and BrAsp) on the defect-free unreconstructed (UR) rutile TiO2(110) surface has been studied using total energy pseudopotential calculations based on density functional theory. All dye molecules form moderate chemical bonds with the defect-free UR rutile (110) surface in the most stable adsorption configurations. Electronic structure analysis reveals that HOMO and LUMO levels of the adsorbed dye molecules appear within the band gap a...
Capacitance analyses of hydrogenated nanocrystalline silicon based thin film transistor ANUTGAN, TAMİLA; ANUTGAN, MUSTAFA; Atilgan, Ismail; Katircioglu, Bayram (Elsevier BV, 2011-03-31) The capacitance-voltage (C-V) measurements within 10(6)-10(-2) Hz frequency range were performed on the hydrogenated nanocrystalline silicon (nc-Si:H) bottom-gate thin film transistor (TFT) and metal-insulator-amorphous silicon (MIAS) structure, mechanically isolated from the same TFT. It was found that the conducting thin layer in nc-Si:H film expands the effective capacitor area beyond the electrode in the TFT structure, which complicates its C-V curves. Considering the TFT capacitance-frequency (C-F) cur...
Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C-60 Films Assessed by Time-Resolved Terahertz Spectroscopy Esentürk, Okan; Lane, Paul A.; Heilweil, Edwin J. (American Chemical Society (ACS), 2009-10-29) Multilayer and 1:1 blended films of zinc phthalocyanine (ZnPc) and buckminsterfullerene (C-60) were investigated as model active layers for solar cells by time-resolved terahertz spectroscopy (TRTS). Relative photon-to-carrier efficiencies were determined from ultrafast decay dynamics of photogenerated carriers using 400 and 800 nm excitation for delay times up to 0.5 ns. The findings are in good agreement with reported solar-cell device measurements, and the results exhibit a near linear increase of the re...
Photocatalytic Conversion of Nitric Oxide on Titanium Dioxide: Cryotrapping of Reaction Products for Online Monitoring by Mass Spectrometry Lu, Weigang; Olaitan, Abayomi D.; Brantley, Matthew R.; Zekavat, Behrooz; Altunöz Erdoğan, Deniz; Ozensoy, Emrah; Solouki, Touradj (American Chemical Society (ACS), 2016-04-21) Details of coupling a catalytic reaction chamber to a liquid nitrogen-cooled cryofocuser/triple quadrupole mass spectrometer for online monitoring of nitric oxide (NO) photocatalytic reaction products are presented. Cryogenic trapping of catalytic reaction products, via cryofocusing prior to mass spectrometry analysis, allows unambiguous characterization of nitrous oxide (N2O) and nitrogen oxide species (i.e., NO and nitrogen dioxide (NO2)) at low concentrations. Results are presented, indicating that the m...
Pentacene Multilayers on Ag(111) Surface METE, ERSEN; Demiroglu, Ilker; Danışman, Mehmet Fatih; Ellialtioglu, Sinasi (American Chemical Society (ACS), 2010-02-18) The structural profiles and electronic properties of pentacene (C22H14) multilayers on Ag(111) surface has been studied within the density functional theory framework. We have performed first-principle total energy calculations based on the projector-augmented wave method to investigate the initial growth patterns of pentacene (Pn) on Ag(111) surface. In its bulk phase, pentacene crystallizes with a triclinic symmetry while a thin film phase having an orthorhombic unit cell is energetically less favorable b...

Citation Formats

O. Esentürk, D. M. Deongchamp, and E. J. Heilweil, “Conjugation effects on carrier mobilities of polythiophenes probed by time-resolved terahertz spectroscopy,” JOURNAL OF PHYSICAL CHEMISTRY C, pp. 10587–10590, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39384.