High Carrier Mobility up to 1.4 cm²·V^-1·s^-1in Non-Peripheral Octahexyl Phthalocyanine

Abstract

Carrier transport properties of a non-peripherally alkyl-substituted phthalocyanine, 1,4,8,11,15,18,22,25-octahexylphthalocyanine (C6PcH2) have been investigated. The material is a low-molecular-weight organic semiconductor with high solubility for typical organic solvents and liquid crystallinity. The carrier mobility was measured in the crystal phase and the hexagonal disordered columnar (Colhd) mesophase by the time-of-flight technique. A strong negative temperature dependence was observed for the hole mobility in the crystal phase, and a maximum drift mobility of 1.4 cm2·V-1·s-1 was achieved at -15 °C. A maximum mobility of 0.5 cm2·V-1·s-1 was obtained for the electrons that had a smaller dependence

Design and synthesis of liquid crystalline phthalocyanines: combinations of substituents that promote the discotic nematic mesophase

“…6 In a developing area, a number of Pcs that exhibit liquid crystal properties show enhanced semiconducting behaviour in the temperature range where the liquid crystal state (mesophase) occurs. [7][8][9][10] Simon et al discovered the first liquid crystalline Pcs in 1982, 11 so adding new examples to the then recently identified class of so-called 'discotic' liquid crystals. Discotic liquid crystals typically possess near planar (often aromatic) cores and bear a number of paraffinic chains.…”

Improvement of Photovoltaic Performance of Octahexylphthalocyanine-Based Bulk-Heterojunction Solar Cells Using Various Fullerene Derivatives

“…A mesogenic phthalocyanine derivative, 1,4,8,11,15,18,22,25octahexylphthalocyanine (C6PcH 2 ), as shown in Fig. 1, was demonstrated to be a promising small molecule for use in BHJ solar cells.…”

“…1, was demonstrated to be a promising small molecule for use in BHJ solar cells. 8) C6PcH 2 exhibits not only excellent processability into a thin film but also appropriate electronic characteristics for a solar cell, such as a deep highest occupied molecular orbital (HOMO) energy level, a relatively small band gap, strong optical absorption, and particularly high hole and electron drift mobilities exceeding 1. Herein, we report the improved photovoltaic performance of C6PcH 2 based BHJ thin film solar cells, such as the external quantum efficiency (EQE) around 500 nm and the opencircuit voltage (V oc ), by using various fullerene derivatives.…”

A liquid crystalline copper phthalocyanine derivative for high performance organic thin film transistors

“…12 For all of these reasons, this class of solution processable, low-molecularweight liquid crystalline phthalocyanine has become a candidate for the semiconducting layer in the design of OTFTs.…”