Pentacene-based metal-base organic transistors(MBOTs) are fabricated.The influence of the charge carrier injection efficiency at the emitter electrode/emitter interface on the device performance is investigated.It is found that the current modulation and the on/off ratio increase with the injection efficiency.By inserting poly(3,4-ethylenedioxythiophene)(PEDOT):PSS/m-MTDATA layers at the emitter electrode/emitter interface,the current modulation and the on/off ratio reach 6.7 mAcm-2 and 23,respectively.Meanwhile,the current gain is 95-96 in our experiment,which is almost independent on the injection efficiency.
