A field effect transistor having a high field effect mobility is provided which can be obtained by a simple method. The field effect transistor includes an organic semiconductor layer composed of a crystallized film of a naphthoporphyrin compound represented by formula (2), which is obtained by the conversion by heating of the coating film of a porphyrin compound represented by formula (1), the organic semiconductor layer having crystal grains with a maximum metediar of 1 μm or more, wherein R
1
and R
2
each independently denote at least one selected from the group consisting of hydrogen, halogen, hydroxyl, and alkyl having 1 to 12 carbon atoms; R
3
denotes at least one selected from the group consisting of a hydrogen atom and an aryl group; and M denotes two hydrogen atoms, a metal atom or a metal oxide.
提供一种具有高场效迁移率的场效应晶体管,该晶体管可以通过简单的方法获得。该场效应晶体管包括由公式(1)表示的
卟啉化合物的涂层膜通过加热转化得到的由公式(2)表示的
萘卟啉化合物的结晶薄膜组成的有机半导体层,该有机半导体层具有最大晶粒直径为1μm或更大的晶粒,其中R1和R2各自独立地表示氢、卤素、羟基和具有1至12个碳原子的烷基中的至少一种;R3表示氢原子和芳基中的至少一种;M表示两个氢原子、
金属原子或金属氧化物。