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Effect of energetic disorder and diffusion on charge transport in organic solar cells

L. ZHANG1, D. K. WAN1, L. G. WANG1,* , M. L. LIU1,*

Affiliation

  1. School of Electrical Engineering and Automation, Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Henan Polytechnic University, Jiaozuo, 454003, People’s Republic of

Abstract

In this paper, the effect of energy disorder and carrier diffusion on charge transport in the photovoltaic blend of small molecule donor BTR and fullerene acceptor PC71BM has been investigated. From an analysis of the J  V characteristics of BTR:PC71BM devices by using the improved mobility model incorporating diffusion and the extended Gaussian disorder model (EGDM), it is observed that the improved model can better describe the charge transport properties and taking diffusion effect in photovoltaic devices into account is necessary. Furthermore, it is found that the carrier mobility in both hole-only and electron-only devices based on the BTR:PC71BM blend is closely related to energy disorder, and lower energy disorder corresponds to higher carrier mobility. This suggests that the amount of energetic disorder in organic solar cells appears to govern the charge transport properties.

Keywords

Charge transport, Mobility model, Energy disorder, Diffusion, Organic solar cells.

Citation

L. ZHANG, D. K. WAN, L. G. WANG, M. L. LIU, Effect of energetic disorder and diffusion on charge transport in organic solar cells, Optoelectronics and Advanced Materials - Rapid Communications, 19, 5-6, May-June 2025, pp.269-274 (2025).

Submitted at: Oct. 31, 2024

Accepted at: June 3, 2025