1C01 液晶性ポルフィリンケイ素錯体のITOサンドイッチ型セルにおける光導電性

抄録

The photoconductive properties of dihydroxo[5, 10, 15, 20-tetrakis(4-n-dodecylphenyl)porphyrinato]silicon(IV) (abbreviated as C_<12>TPPSi(OH)_2) were investigated for an ITO sandwich cell (ITO/C_<12>TPPSi(OH)_2/ITO) both in a solid (25 ℃) and a lamellar columnar mesophase (100 ℃) of C_<12>TPPSi(OH)_2. This complex shows only one mesophase with a wide temperature range between 84 and 211 ℃. It was observed negative electrode illumination gives larger photocurrent than positive one. This photocurrent rectification behaviour is quite opposite to that of the corresponding porphyrin free base (C_<15>TPPH_2) and unusual for symmetrical ITO cells of porphyrins. We also report action spectra of photocurrent for the ITO/C_<12>TPPSi(OH)_2/ITO cell as a function of wavelength.