Automated open-source software for charge transport analysis in single-carrier organic semiconductor diodes

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Felekidis, NikolaosLinköpings universitet,Komplexa material och system,Tekniska fakulteten (author)

Automated open-source software for charge transport analysis in single-carrier organic semiconductor diodes

Article/chapterEnglish2018

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ELSEVIER SCIENCE BV,2018
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LIBRIS-ID:oai:DiVA.org:liu-150200
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150200URI
https://doi.org/10.1016/j.orgel.2018.06.010DOI

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Language:English
Summary in:English

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Funding Agencies|Knut and Alice Wallenberg Foundation [KAW 2016.0494]
Organic electronics is an emerging technology with numerous applications in which the active layer is composed of an organic semiconductor (OSC) or blends of multiple OSC. One of the key performance parameters for such devices is the charge carrier mobility which can be evaluated by different measurement techniques. Here, we review different formalisms for extraction and analysis of hole mobilities from temperature-dependent space-charge limited conductivity (SCLC) measurements for pristine OSC as well as for binary and ternary blends as used in e.g. photovoltaic applications. The model is also applicable to n-type materials. Possible sources of measurement errors, such as the presence of traps and series resistance, are discussed. We show that by a simple method of selecting a proper experimental data range these errors can be avoided. The Murgatroyd-Gill analytical model in combination with the Gaussian Disorder Model is used to extract zero-field hole mobilities as well as estimates of the Gaussian energetic disorder in the HOMO level from experimental data. The resulting mobilities are in excellent agreement with those found from more elaborate fits to a full drift-diffusion model that includes a temperature, field and density dependent charge carrier mobility; the same holds for the Gaussian disorder of pure materials and blends with low fullerene concentration. The zero-field mobilities are also analyzed according to an Arrhenius model that was previously argued to reveal a universal mobility law; for most -but not all- material systems in the present work this framework gave an equally good fit to the experimental data as the other models. An automated fitting freeware, incorporating the different models, is made openly available for download and minimizes error, user input and SCLC data analysis time; e.g. SCLC current-voltage curves at several different temperatures can be globally fitted in a few seconds.

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Melianas, ArmantasStanford Univ, CA 94305 USA (author)
Kemerink, MartijnLinköpings universitet,Komplexa material och system,Tekniska fakulteten(Swepub:liu)marke89 (author)
Linköpings universitetKomplexa material och system (creator_code:org_t)

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In:Organic electronics: ELSEVIER SCIENCE BV61, s. 318-3281566-11991878-5530

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Other Electrical ...

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