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Title:The effect of polymer molecular weight on the performance of PTB7-Th:O-IDTBR non-fullerene organic solar cells
Authors:ID Hoefler, Sebastian F., Graz University of Technology (Author)
ID Pavlica, Egon, UNG (Author)
ID Bratina, Gvido, UNG (Author), et al.
Files: This document has no files that are freely available to the public. This document may have a physical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Recent advances in the development of non-fullerene acceptors have increased the power conversion efficiency of organic solar cells to approximately 13%. Fullerene-derivatives and non-fullerene acceptors possess distinctively different structural, optical and electronic properties, which also change the requirements on the polymer donor in non-fullerene organic solar cells. Therefore, in this study, the effect of the molecular weight of the conjugated polymer on the photovoltaic performance, charge carrier mobility, crystallization properties, film morphology, and non-geminate recombination dynamics is systematically investigated in polymer:small molecule organic solar cells using the low bandgap polymer PTB7-Th as the donor and the non-fullerene indacenodithiophene-based small molecule O-IDTBR as the acceptor. Among the examined polymer samples (50–300 kDa), high molecular weights of PTB7-Th (with an optimum molecular weight of 200 kDa) are advantageous to achieve high efficiencies up to 10%, which can be correlated with an increased crystallinity, an improved field-effect hole mobility (1.05 × 10−2 cm2 V−1 s−1), lower charge carrier trapping and a reduced activation energy of charge transport (98 meV). Bias-assisted charge extraction and transient photovoltage measurements reveal higher carrier concentrations (1016 cm−3) and long lifetimes (4.5 μs) as well as lower non-geminate recombination rate constants in the corresponding devices, supporting the high photocurrents (ca. 15.2 mA cm−2) and fill factors (>60%).
Keywords:organski polprevodniki, gibljivost, organske sončne celice
Publication version:Version of Record
Year of publishing:2018
Number of pages:9506-9516
Numbering:6
PID:20.500.12556/RUNG-3946-612eb1f9-1a84-26e1-e6f0-ce88c965f4cc New window
COBISS.SI-ID:5156347 New window
DOI:10.1039/c8ta02467g New window
NUK URN:URN:SI:UNG:REP:07SLQDVV
Publication date in RUNG:28.05.2018
Views:5898
Downloads:0
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HOEFLER, Sebastian F., PAVLICA, Egon and BRATINA, Gvido, 2018, The effect of polymer molecular weight on the performance of PTB7-Th:O-IDTBR non-fullerene organic solar cells. Journal of Materials Chemistry A [online]. 2018. Vol. 6, p. 9506–9516. [Accessed 7 April 2025]. DOI 10.1039/c8ta02467g. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=3946
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Record is a part of a journal

Title:Journal of Materials Chemistry A
Year of publishing:2018

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P1-0055

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:28.05.2018

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