Carbazole compound as well as preparation method and application thereof

The invention relates to a carbazole compound as well as a preparation method and application thereof. The structural general formula of the carbazole compound is as shown in formula (I): # imgabs0 #, wherein Ar1 and Ar2 are respectively and independently aryl with the ring atom number of 6-20; each R1 is independently selected from one of the following groups: *-COOH, *-SO3H and # imgabs 1 #; each R2 is independently an alkylene group; each R3 is independently an alkyl group, an alkoxy group, a cyano group or # imgabs2, each R4 is independently selected from one of the following groups: # imgabs3 # imgabs4 # r is any integer from 0 to 4, n is any integer from 1 to 6, and * represents a connection site. The carbazole compound has the advantages of excellent hole transport property, good stability and good wettability, is suitable for being used as a hole transport material, and improves the filling factor and the photoelectric conversion efficiency of a photoelectric device and prolongs the service life of th