Photoconduction in a polydiacetylene film

Abstract

Steady state photoconductivity, optical absorption and dark conductivity measurements in thin films of polydiacetylene ((8-butoxycarbonyl)methylurethanyl)-1-(5-pyrimidyl)octa-1, 3-diyne (PDA-BPOD) are reported. Steady state photoconductivity results are discussed within the framework of the one-dimensional Onsager theory of geminate recombination. The photoconductivity action spectrum shows a peak at 1.9 eV and a direct band to band transition above 2.4 eV. The absorption spectrum at 50 K is red shifted with respect to the 300 K spectrum. Dark conductivity studies show that the dominant conduction at high fields is due to Schottky emission with a barrier of 0.65 eV.

Structural Transitions in Polydiacetylene Langmuir Films

“…Amphiphilic long-chain diacetylene monomers, compressed at the air−water interface and then UV polymerized, form an ultrathin, stable trilayer structured Langmuir film (LF). − A PDA LF formed on water has unique strand morphology parallel to the polymer direction as a result of its rigid and unbranched linear structure, which provides it with mechanical and chemical stability. This, along with the unique electro-optical properties of PDAs, − make them attractive materials for a variety of technological applications such as chemical and biological sensors, resist for lithography, , effective template for oriented nucleation of inorganic crystals such as calcite , and semiconducting nanocrystals. − …”

Metal‐Rich Ternary Perovskite Nitrides

“…All compounds (R 3 N)In are metallic, with the magnetic properties dominated by the rare-earth metal ions. [55] While La 3 In shows a superconducting transition at T c ≈ 10 K, [56] (La 3 N)In lacks any indication for superconductivity. Earlier it was observed that T c does not significantly change with introduction of O or B into La 3 In within the full range of 0 ≤ x ≤ 1 in cubic (La 3 Z x )In, while T c decreases continuously upon addition of carbon.…”

Electrooptic Properties of Submonolayer Polydiacetylene Nanoparticle Film Probed by Surface Plasmon Resonance Spectroscopy

“…Polydiacetylene (PDA) and its derivatives are attractive materials for electronics and photonics 1) since the PDA films of fine quality are formed by use of Langmuir-Blodgett, 2,3) vacuum evaporation 4) and the spin-coating 5) techniques. It has photo conductivity 6,7) and nonlinear optical (NLO) properties, arising from its -conjugation system. Many studies have been appeared on nonlinear optics, [8][9][10][11][12][13][14][15] electrical absorption, [16][17][18] unique optical elements [19][20][21][22] and sensing applications.…”