Journal article
Physical, optical, electronic properties and mobility measurements of a new donor–acceptor–donor oligomer
Synthetic metals, Vol.162(13-14), pp.1198-1203
08/2012
Handle:
https://hdl.handle.net/2376/115368
Abstract
► New donor–acceptor–donor oligomer as donor material. ► Thermal stability and good quality film morphology allow for optimized charge mobility. ► Optical and electronic properties make this oligomer a promising light harvesting material for solar cell applications. ► Single carrier type diodes allows for initial measurements of hole mobility (μ0).
A new organic compound (tertmethoxy di-triphenylamine di-thiophene-benzothiadiazole; DTBT-DTPA-TMeO) recently synthesized displays two strong absorption peaks in the visible range of the solar spectrum. Thermal behavior of this new donor–acceptor–donor (D–A–D) oligomer is investigated by differential scanning calorimetry and thermogravimetric analysis. The decomposition temperature is found to be at about 400°C and a smectic mesophase transition at about 115°C (crystal liquid–crystal transition). Solution and solution processed films onto ITO and ITO/MoO3 are characterized by UV–Vis, AFM and XPS-UPS measurements. An optical band gap of 1.85eV is reported from the UV–Vis data and agrees well with the theoretical value of 1.99eV. AFM analysis of spin coated films shows smooth uniform coverage free of pin holes. Work functions and HOMO energy values are determined from UPS measurements and allow the construction of an energy band diagram. The hole mobility for a un-annealed single diode device is measured at about 10−5cm2/Vs.
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Details
- Title
- Physical, optical, electronic properties and mobility measurements of a new donor–acceptor–donor oligomer
- Creators
- Ross Kerner - Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USAYilin Li - School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaLouis Scudiero - Chemistry Department and Materials Science and Engineering Program, Washington State University, Pullman, WA 99164, USA
- Publication Details
- Synthetic metals, Vol.162(13-14), pp.1198-1203
- Academic Unit
- Chemistry, Department of
- Publisher
- Elsevier B.V
- Identifiers
- 99900547686301842
- Language
- English
- Resource Type
- Journal article