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J. Y. LIU1, L. ZHANG1,* , L. G. WANG1,* , Y. J. WANG1, Y. GUO1
- School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of China
In this paper, the hole transport and spatial correlation between the site energies in blue light-emitting polyspirobifluorene (PSF) with copolymerized '', ,,N N N Ntetraaryldiamino biphenyl (TAD)hole transport units areinvestigated. It is shown that the temperature dependent and TAD concentration dependent current density versus voltage characteristics of PSF hole-only devices can be accurately described by using the improved extended Gaussian disorder model (IEGDM) and the extended correlated disorder model (ECDM), within which the mobility depends on the electric field and carrier density and within which spatial correlations between the site energies are absent or are included, respectively. Based on a comparison of the model parameters as obtained from both models, we view the more realistic intersite distance obtainedusing the IEGDM (1.3nm) compared to the value obtainedusing the ECDM (0.24nm) as an indication that in the PSF-TAD copolymersstudied correlations between the site energies are absent or play a minor role..
Holetransport, PSF-TAD copolymers, Spatially correlated disorder, Intersite distance.
Submitted at: Feb. 13, 2020
Accepted at: Dec. 7, 2020
J. Y. LIU, L. ZHANG, L. G. WANG, Y. J. WANG, Y. GUO, The effect of spatially correlated disorder on the hole transport in PSF-TAD copolymers, Journal of Optoelectronics and Advanced Materials Vol. 22, Iss. 11-12, pp. 573-578 (2020)
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