NOVELTY - An organic thin-film transistor has azapentacyclo-type derivative (I) in a semiconductor active layer (14).    USE - Organic thin-film transistor. Azapentacyclo-type derivative is used for organic-semiconductor material, organic thin-film transistor material, and coating solution for forming organic semiconductor thin film for nonluminous organic-semiconductor device (all claimed). Uses include but are not limited to solid-state image sensor, optical sensor, solar cell, gas sensor, organic rectifier, organic inverter and information recording element.    ADVANTAGE - The organic thin-film transistor that contains azapentacyclo-type derivative, exhibits high carrier mobility and little change in threshold voltage after being driven repeatedly. The organic thin film applicable to organic thin-film transistor, has high film quality, air oxidation-proof property, oxidation reduction stability and producibility, and therefore manufacturing cost is suppressed.    DETAILED DESCRIPTION - An organic thin-film transistor has azapentacyclo-type derivative of formula (I) in a semiconductor active layer.    Z=substituent having length of 3.7 Angstrom from the nitrogen atom to the end of the substituent;    R1-R8=H or substituent, in which at least one of R1-R8 is substituent of formula (i);    L=single bond or 2 or more divalent linking groups of formulae (L-1)-(L-12);    R=2C or more (un)substituted oligosiloxane group, oligo-oxyethylene group having two or more oxyethylene repeating units, or oligosiloxane group having 2 or more Si;    n=1 or more;    m=4;    p=2;and    R'=H or substituent.    INDEPENDENT CLAIMS are included for the following:    (1) azapentacyclo-type derivative (I);    (2) organic-semiconductor material, which contains azapentacyclo-type derivative (I);    (3) organic thin-film transistor material, which contains azapentacyclo-type derivative (I);    (4) coating solution for nonluminous organic-semiconductor device, which contains azapentacyclo-type derivative (I); and    (5) organic semiconductor thin film, which contains azapentacyclo-type derivative (I).    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of organic thin-film transistor.    Substrate (11)    Electrodes (12,15a,15b)    Insulator layer (13)    Semiconductor active layer (14)