Unifying Energetic Disorder from Charge Transport and Band Bending in Organic Semiconductors

Karki, Akchheta; Wetzelaer, Gert‐Jan A. H.; Reddy, Gollapalli Narayana Manjunatha; Nádaždy, Vojtech; Seifrid, Martin; Schauer, Franz; Bazan, Guillermo C.; Chmelka, Bradley F.; Blom, Paul W. M.; Nguyen, Thuc‐Quyen

doi:10.1002/adfm.201901109

Title: Unifying Energetic Disorder from Charge Transport and Band Bending in Organic Semiconductors

Journal Article · Mon Mar 25 00:00:00 EDT 2019 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201901109· OSTI ID:1503364

^[1]; Wetzelaer, Gert‐Jan A. H. ^[2]; Reddy, Gollapalli Narayana Manjunatha ^[3]; Nádaždy, Vojtech ^[4]; Seifrid, Martin ^[1]; Schauer, Franz ^[5]; Bazan, Guillermo C. ^[1]; Chmelka, Bradley F. ^[3]; Blom, Paul W. M. ^[2]; Nguyen, Thuc‐Quyen ^[1]

Center for Polymers and Organic Solids University of California Santa Barbara (UCSB) Santa Barbara CA 93106 USA
Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
Department of Chemical Engineering University of California Santa Barbara (UCSB) Santa Barbara CA 93106 USA
Institute of Physics SAS Dubravsk a cesta 9 845 11 Bratislava Slovak Republic
Tomas Bata University in Zlin Nad Stráneˇmi 4511 Zlín CZ‐760 05 Czech Republic

Abstract Characterizing the density of states (DOS) width accurately is critical in understanding the charge‐transport properties of organic semiconducting materials as broader DOS distributions lead to an inferior transport. From a morphological standpoint, the relative densities of ordered and disordered regions are known to affect charge‐transport properties in films; however, a comparison between molecular structures showing quantifiable ordered and disordered regions at an atomic level and its impact on DOS widths and charge‐transport properties has yet to be made. In this work, for the first time, the DOS distribution widths of two model conjugated polymer systems are characterized using three different techniques. A quantitative correlation between energetic disorder from band‐bending measurements and charge transport is established, providing direct experimental evidence that charge‐carrier mobility in disordered materials is compromised due to the relaxation of carriers into the tail states of the DOS. Distinction and quantification of ordered and disordered regions of thin films at an atomic level is achieved using solid‐state NMR spectroscopy. An ability to compare solid‐state film morphologies of organic semiconducting polymers to energetic disorder, and in turn charge transport, can provide useful guidelines for applications of organic conjugated polymers in pertinent devices.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1503364

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 29 Journal Issue: 20; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 60 works

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