TEMPERATURE-DEPENDENT I-V CHARACTERISTICS AND THERMAL ANNEALING EFFECTS OF C-22-QUINOLIUM(TCNQ) LANGMUIR-BLODGETT-FILMS

被引:6
作者
KIM, TW
SHIN, DM
SONG, IS
KANG, DY
KWON, YS
机构
[1] HONGIK UNIV, DEPT ELECT & CONTROL ENGN, SEOUL 121791, SOUTH KOREA
[2] DONG A UNIV, DEPT ELECT ENGN, PUSAN, SOUTH KOREA
来源
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 1994年 / 247卷
关键词
D O I
10.1080/10587259408039209
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Electrical properties and thermal annealing effects of C-22-quinolium(TCNQ) Langmuir-Blodgett(LB) films were studied. Typical current-voltage(I-V) characteristics along the perpendicular direction show an anomalous behavior of breakdown near the electric-field strength of 10(delta) V/cm. From the study of I-V characteristics in the high-electric field region, it is found that there is a contribution of joule heating in addition to the electrical effect. To see the thermal influence of the specimen, current was measured as a function of temperature(20 similar to 180 degrees C). It shows that the current increases about 4 orders of magnitude near 60 similar to 70 degrees C, and remains constant for a while up to similar to 150 degrees C and then suddenly drops. Such increase of current near 60 similar to 70 degrees C seems to be related to a softness of alkyl chains. Besides the electrical measurements, UV/visible absorption(300 similar to 800nm) of the thermally annealed sample was measured to see the internal-structure change. It is found there are four characteristic peaks. At 494nm, the optical absorption of the thermally annealed specimen at 60 degrees C starts to increase and stays almost constant upto similar to 140 degrees C. And eventually it disappears above 180 degrees C.
引用
收藏
页码:233 / 242
页数:10
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