Suppressing the Surface Recombination and Tuning the Open-Circuit Voltage of Polymer/Fullerene Solar Cells by Implementing an Aggregative Ternary Compound

Journal article
(Original article)


Publication Details

Author(s): Galli D, Gasparini N, Forster M, Eckert A, Widling C, Killian M, Avgeropoulos A, Gregoriou VG, Scherf U, Chochos CL, Brabec C, Ameri T
Journal: ACS Applied Materials and Interfaces
Publisher: American Chemical Society
Publication year: 2018
Volume: 10
Journal issue: 34
Pages range: 28803-28811
ISSN: 1944-8244
eISSN: 1944-8252
Language: English


Abstract

In this work, we present a novel small molecule based on
dithienylthienothiadiazole units (named SM1) acting as an efficient
component in ternary blend organic solar cells to modify the hole
extraction at the interface. Our findings show that the SM1 suppresses
the surface recombination and enhances the open-circuit voltage (Voc). By introducing SM1 in a host system composed of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), we obtained Voc
values of up to 0.75 V and fill factors larger than 70% for the ternary
blends. As a consequence, the power conversion efficiency is improved
by about 30% compared to P3HT:PCBM binary devices. Interestingly,
external quantum efficiency and absorption spectra in the near-infrared
region do not show any contribution of SM1 in dried films. Instead, the
addition of the small molecule improves the Voc by
reducing the surface recombination losses. To shed light on the
recombination processes, we carried out Fourier-transform photocurrent
spectroscopy and impedance spectroscopy measurements. This work shows
that the ternary concept can also have functionalities other than
photosensitization and can even act as a morphology-directing agent or
an interface modifier.


FAU Authors / FAU Editors

Ameri, Tayebeh Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Galli, Diana
Institute Materials for Electronics and Energy Technology (i-MEET)
Gasparini, Nicola
Institute Materials for Electronics and Energy Technology (i-MEET)
Killian, Manuela Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)


External institutions
Advent Technologies SA
Bergische Universität Wuppertal
University of Ioannina / Πανεπιστήμιο Ιωαννίνων


How to cite

APA:
Galli, D., Gasparini, N., Forster, M., Eckert, A., Widling, C., Killian, M.,... Ameri, T. (2018). Suppressing the Surface Recombination and Tuning the Open-Circuit Voltage of Polymer/Fullerene Solar Cells by Implementing an Aggregative Ternary Compound. ACS Applied Materials and Interfaces, 10(34), 28803-28811. https://dx.doi.org/10.1021/acsami.8b09174

MLA:
Galli, Diana, et al. "Suppressing the Surface Recombination and Tuning the Open-Circuit Voltage of Polymer/Fullerene Solar Cells by Implementing an Aggregative Ternary Compound." ACS Applied Materials and Interfaces 10.34 (2018): 28803-28811.

BibTeX: 

Last updated on 2019-15-05 at 10:34