Comparison of the electronic properties of sublimation- and vapor-Bridgman-grown crystals of tetracene

The hole mobilities in a vapor-Bridgman-grown crystal and in sublimation-grown crystals of tetracene were measured along the c*-direction in a temperature range from 300to450K by the time-of-flight method. The mobility was found to increase as a function of temperature in the vapor-Bridgman-grown crystal, indicating that the transport was thermally activated. After reaching its maximum of about 1cm2∕Vs at 320K, the mobility in the sublimation-grown crystals decreased with temperature in accordance with band transport models. Gas chromatography measurements indicated that the difference in the electronic transport properties could be related to a higher concentration of chemical impurities in the vapor-Bridgman crystal.

[1]  Pa Peter Bobbert,et al.  Ab initio theory of charge-carrier conduction in ultrapure organic crystals , 2004 .

[2]  A. Morpurgo,et al.  Organic single-crystal field-effect transistors , 2004, cond-mat/0404100.

[3]  A. Morpurgo,et al.  Space charge limited transport and time of flight measurements in tetracene single crystals: a comparative study. , 2003, cond-mat/0308391.

[4]  M. Sokolowski,et al.  Nucleation and growth of molecular organic crystals in a liquid film under vapor deposition. , 2003, Physical Review Letters.

[5]  S. Sysoev,et al.  Single-crystal organic field effect transistors with the hole mobility ∼8 cm2/V s , 2003, cond-mat/0306192.

[6]  N. Karl,et al.  Charge-Carrier Mobility in Organic Crystals , 2001 .

[7]  N. Apsley,et al.  Temperature dependent electronic conduction in semiconductors , 1980 .

[8]  L. Schein.  Temperature independent drift mobility along the molecular direction of As 2 S 3 , 1977 .

[9]  J. Berréhar,et al.  Drift mobility of holes in crystalline tetracene , 1976 .

[10]  K. H. Jones.  Anthracene and Anthracene-Tetracene Crystals from Vapor , 1968 .

[11]  D. C. Hoesterey,et al.  The trapping of photocarriers in anthracene by anthraquinone, anthrone and naphthacene☆ , 1963 .

[12]  G. Grosso,et al.  Organic Electronic Materials: Conjugated Polymers and Low Molecular Weight Organic Solids , 2001 .

[13]  B. Gyorffy,et al.  Crystals: Growth, Properties and Applications , 1981 .

[14]  H. Inokuchi,et al.  Electrical Conductivity of Organic Semiconductors , 1961 .