Photophysics of Molecular-Weight-Induced Losses in Indacenodithienothiophene-Based Solar Cells

Gasparini N, Katsouras A, Prodromidis MI, Avgeropoulos A, Baran D, Salvador MF, Fladischer S, Spiecker E, Chochos CL, Ameri T, Brabec C (2015)

Publication Status: Published

Publication Type: Journal article

Publication year: 2015

Journal

Advanced Functional Materials Wiley-VCH Verlag

Publisher: Wiley-VCH Verlag

Book Volume: 25

Pages Range: 4898-4907

Journal Issue: 30

DOI: 10.1002/adfm.201501062

Abstract

The photovoltaic performance and optoelectronic properties of a donor-acceptor copolymer are reported based on indacenodithienothiophene (IDTT) and 2,3-bis(3-(octyloxy)phenyl)quinoxaline moieties (PIDTTQ) as a function of the number-average molecular weight (Mn). Current-voltage measurements and photoinduced charge carrier extraction by linear increasing voltage (photo-CELIV) reveal improved charge generation and charge transport properties in these high band gap systems with increasing Mn, while polymers with low molecular weight suffer from diminished charge carrier extraction because of low mobility-lifetime (μτ) product. By combining Fourier-transform photocurrent spectroscopy (FTPS) with electroluminscence spectroscopy, it is demonstrate that increasing Mn reduces the nonradiative recombination losses. Solar cells based on PIDTTQ with Mn = 58 kD feature a power conversion efficiency of 6.0% and a charge carrier mobility of 2.1 × 10-4 cm2 V-1 s-1 when doctor bladed in air, without the need for thermal treatment. This study exhibits the strong correlations between polymer fractionation and its optoelectronics characteristics, which informs the polymer design rules toward highly efficient organic solar cells.

Authors with CRIS profile

Nicola Gasparini Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Derya Baran Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Michael Filipe Salvador Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Stefanie Rechberger Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Tayebeh Ameri Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM) Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)

Involved external institutions

University of Ioannina / Πανεπιστήμιο Ιωαννίνων GR Greece (GR)

How to cite

APA:

Gasparini, N., Katsouras, A., Prodromidis, M.I., Avgeropoulos, A., Baran, D., Salvador, M.F.,... Brabec, C. (2015). Photophysics of Molecular-Weight-Induced Losses in Indacenodithienothiophene-Based Solar Cells. Advanced Functional Materials, 25(30), 4898-4907. https://doi.org/10.1002/adfm.201501062

MLA:

Gasparini, Nicola, et al. "Photophysics of Molecular-Weight-Induced Losses in Indacenodithienothiophene-Based Solar Cells." Advanced Functional Materials 25.30 (2015): 4898-4907.

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