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Effect of diffusion on charge transport in polymer:non-fullerene blends

Y. F. LI1, Y. J. WANG1,* , L. G. WANG1,* , Y. GUO1, L. ZHANG1

Affiliation

  1. School of Electrical Engineering and Automation, Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of C

Abstract

Recently, non-fullerene organic semiconductors have attracted significant attention as acceptors in organic photovoltaics due to their great potential to realize high power conversion efficiencies. In this paper, the effect of diffusion on charge transport in the blend of polymer PBDB-T derivative PM6 and non-fullerene acceptor Y6 is investigated. It is shown that the current density-voltage characteristics from the drift-diffusion simulations incorporating the extended Gaussian disorder model (EGDM) are more consistent with experimental data in comparison with those obtained from the only drift model in both PM6:Y6 hole-only and electron-only devices. Moreover, it is found that the effect of diffusion on charge transport is more pronounced at low voltages and seems to be negligible when the applied voltage exceeds 1 V. For the analysis of charge transport in polymer:non-fullerene blends, it is essential that both drift and diffusion of charge carriers are taken into account..

Keywords

Charge transport, Organic photovoltaics, Diffusion, Polymer:non-fullerene blends, Energy disorder.

Submitted at: Oct. 8, 2021
Accepted at: April 8, 2022

Citation

Y. F. LI, Y. J. WANG, L. G. WANG, Y. GUO, L. ZHANG, Effect of diffusion on charge transport in polymer:non-fullerene blends, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 3-4, pp. 146-150 (2022)