Tuning the nanostructure and molecular orientation of high molecular weight diketopyrrolopyrrole-based polymers for high-performance field-effect transistors. Issue 2 (19th December 2022)

• Record Type: Journal Article
• Authors: Deng, Junyang; Guo, Yifu; Li, Weiwei; Xie, Zhenhua; Ke, Yubin; Janssen, René A. J.; Li, Mengmeng
• Is Part Of: Nanoscale. Volume 15:Issue 2(2023)
• Page Start: 553
• Page End: 561
• Publication Date: 2022-12-19
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr05382a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The molecular orientation of PDPP3T is efficiently tuned from a face- to an edge-on texture using appropriate solvents, with the formation of a fibril-like nanostructure, leading to a significant performance improvement in field-effect transistors. Abstract : As a versatile class of semiconductors, diketopyrrolopyrrole (DPP)-based conjugated polymers are well suited for applications of next-generation plastic electronics because of their excellent and tunable optoelectronic properties via a rational design of chemical structures. However, it remains a challenge to unravel and eventually influence the correlation between their solution-state aggregation and solid-state microstructure. In this contribution, the solution-state aggregation of high molecular weight PDPP3T is effectively enhanced by solvent selectivity, and a fibril-like nanostructure with short-range and long-range order is generated and tuned in thin films. The predominant role of solvent quality on polymer packing orientation is revealed, with an orientational transition from a face-on to an edge-on texture for the same PDPP3T. The resultant edge-on arranged films lead to a significant improvement in charge transport in transistors, and the field-effect hole mobility reaches 2.12 cm 2 V −1 s −1 with a drain current on/off ratio of up to 10 8 . Our findings offer a new strategy for enhancing the device performance of polymer electronic devices.