Fernandes, J.M.Kiran, M.R.Ulla, H.Satyanarayan, M.N.Umesh, G.2020-03-312020-03-312015Superlattices and Microstructures, 2015, Vol.83, , pp.766-775https://idr.nitk.ac.in/handle/123456789/11763The charge carrier transport is studied in N,N?-di(1-naphthyl)-N,N?-diphenyl-(1,1?-biphenyl)-4,4?-diamine (?-NPD) with the incorporation of sequentially doped p-type dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) as hole-injection layer in hole-only device structures. The field dependent mobility of the charge carriers is determined using frequency dependent capacitance, conductance and impedance methods by varying the thickness of ?-NPD. The Poole-Frenkel zero-field mobility and the Poole-Frenkel coefficient thus obtained for each device in all the three methods is found to be almost constant. 2015 Elsevier Ltd. All rights reserved.Article