Journal Article

PUBDB-2025-03699

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Flexible End‐Group Triggered Temporal Supramolecular Reordering on Substrate Surfaces and Its Impact on Electron Transport

Giri, I.Extern* ; Vijayaraghavan, R. (Corresponding author)Extern*

2025
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/smll.202502456  doi:10.3204/PUBDB-2025-03699

Abstract: The temporal stability of domain microstructure and morphologies is critical in regulating charge transport in organic field effect transistors (OFETs), ensuring consistent device performance and long-term reliability. Overcoming stability challenges in small molecular weight n-type materials, particularly in solution-processed active layers, necessitates careful molecular design. While flexible end groups or side chains enhance solution processability, they also introduce temporal disorder, or temporal reordering compromising device endurance. This study examines the trade-offs between rigid and flexible end groups in n-type molecular semiconductors, emphasizing their influence on morphological reordering in active layer films. As representative materials, $n$-Hex$_2$NDI, with flexible end groups, is compared to $^t$BCyH$_2$NDI, which features rigid end groups. Films containing flexible side chains exhibit pronounced sensitivity to thermal annealing, significantly modifying the molecular and supramolecular arrangement and the crystallinity of $n$-Hex$_2$NDI. Moreover, these flexible chains reduce current-voltage hysteresis, indicating enhanced structural order at elevated temperatures. Conversely, $^t$BCyH$_2$NDI demonstrates minimal temporal disorder at the molecular level organization, maintaining stable optical properties and negligible changes in current-voltage hysteresis upon annealing.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. INDIA-DESY - INDIA-DESY Collaboration (2020_Join2-INDIA-DESY) (2020_Join2-INDIA-DESY)
3. FS-Proposal: I-20221013 (I-20221013) (I-20221013)
4. FS-Proposal: I-20211469 (I-20211469) (I-20211469)

Experiment(s):

1. PETRA Beamline P08 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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