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Blend ratio and applied voltage effects on the charge recombination in bulk heterojunction polymer solar cells based on anthracene-containing poly(arylene-ethynylene)-alt-poly(arylene-vinylene) studied using magnetoconductance
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SYSNO ASEP 0542810 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Blend ratio and applied voltage effects on the charge recombination in bulk heterojunction polymer solar cells based on anthracene-containing poly(arylene-ethynylene)-alt-poly(arylene-vinylene) studied using magnetoconductance Author(s) Radaoui, M. (TN)
Taboubi, Oumayma (UMCH-V) RID, ORCID
Ben Fredj, A. (TN)
Romdhane, S. (TN)
Egbe, D. A. M. (AT)
Bouchriha, H. (TN)Article number 110190 Source Title Journal of Physics and Chemistry of Solids. - : Elsevier - ISSN 0022-3697
Roč. 156, September (2021)Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords polymer solar cell ; charge recombination ; organic magnetoconductance Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000659804900041 EID SCOPUS 85106576388 DOI 10.1016/j.jpcs.2021.110190 Annotation We have investigated the magnetic field effect on the current in bulk heterojunction polymer solar cells made of blends of an anthracene-containing poly(arylene-ethynylene)-alt-poly (arylene-vinylene) (AnE-PVstat) and fullerene molecules prepared in various ratios (1:1, 1:2, 1:3 and 1:4) and different applied voltages ranging from 0.7 to 0.95 V in steps of 0.05 V. The efficiencies and fill factors of the resulting devices improved upon increasing the PCBM content. The highest efficiency obtained was 2.7% for the device prepared using 75% PCBM. The measured magnetoconductance (MC) is positive and monotonic over the full range of the blend ratios and applied voltages studied. We analyzed the MC effect using a magnetoconductance model controlled by interconversion of the singlet and triplet (MIST) electron-hole (e-h) pairs states based on density matrix formalism using the stochastic Liouville equation considering that the singlet and triplet e-h pairs have different recombination and dissociation rates to theoretically reproduce the line shape of MC. For all the applied voltages studied, the recombination and dissociation rates of the e-h pairs on the singlet and triplet states decreased upon increasing the fullerene content until it reached a maximum with a PCBM content of 75 wt%. After this PCBM content, the rates started to increase. However, for each blend ratio, the recombination and dissociation rates of the singlet and triplet e-h pairs increase when the voltage is increased. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0022369721002560?via%3Dihub
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