Band-like transport in solution-processed perylene diimide dianion films with high Hall mobility

Yanhua Jia; Qinglin Jiang; Hanlin Gan; Bohan Wang; Xiandong He; Jiadong Zhou; Zetong Ma; Jiang Zhang; Yuguang Ma

doi:10.1093/nsr/nwae087

Band-like transport in solution-processed perylene diimide dianion films with high Hall mobility

Natl Sci Rev. 2024 Mar 8;11(5):nwae087. doi: 10.1093/nsr/nwae087. eCollection 2024 May.

Authors

Yanhua Jia¹, Qinglin Jiang¹, Hanlin Gan¹, Bohan Wang¹, Xiandong He¹, Jiadong Zhou¹, Zetong Ma¹, Jiang Zhang², Yuguang Ma¹

Affiliations

¹ Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.
² Department of Physics, South China University of Technology, Guangzhou 510640, China.

Abstract

It is crucial to prepare high-mobility organic polycrystalline film through solution processing. However, the delocalized carrier transport of polycrystalline films in organic semiconductors has rarely been investigated through Hall-effect measurement. This study presents a strategy for building strong intermolecular interactions to fabricate solution-crystallized p-type perylene diimide (PDI) dianion films with a closer intermolecular π-π stacking distance of 3.25 Å. The highly delocalized carriers enable a competitive Hall mobility of 3 cm² V^-1 s^-1, comparable to that of the reported high-mobility organic single crystals. The PDI dianion films exhibit a high electrical conductivity of 17 S cm^-1 and typical band-like transport, as evidenced by the negative temperature linear coefficient of mobility proportional to T^-3/2. This work demonstrates that, as the intermolecular π-π interactions become strong enough, they will display high mobility and conductivity, providing a new approach to developing high-mobility organic semiconductor materials.

Keywords: Hall mobility; band-like transport; dianion aggregates; perylene diimide; solution-processed.