“…Regarding molecules served as the p-dopant in organic semiconductors, several strong electron acceptors or oxidants had been used, such as 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane ͑F4-TCNQ͒, 6 SbCl 5 , 15 I 2 , 16 WO 3 , 17 ReO 3 , 18 and MoO x . [19][20][21] Despite the intensively explored p-type electrical doping system, problematic issues still remain. The problems related to inorganic materials include noncompatible high deposition temperature, pixel crosstalk, low optical transparency, or material toxicity.…”