Issue 5, 2017

Cyclopentadithiophene organic core in small molecule organic solar cells: morphological control of carrier recombination

Abstract

Two new planar and symmetrical A–D–A (electron acceptor–electron donor–electron acceptor) small molecules based on a commercial cyclopentadithiophene derivative have been synthesized for solution processed small molecule organic solar cells. The aim was to synthesise the molecules to be energetically identical (similar HOMO–LUMO energy levels) in order to assign the differences observed to changes in the film morphology or to differences in the interfacial recombination kinetics or both. Devices were electrically characterized under one sun simulated (1.5 AM G) conditions by determining current–voltage curves, light harvesting efficiencies and external quantum efficiencies. Moreover, time-resolved photo-induced techniques such as photo-induced charge extraction and photo-induced transient photo-voltage were also performed. The results demonstrate that, despite having the same core, i.e. cyclopentadithiophene, the use of one hexyl chain instead of two in the organic molecule leads to a greater control of the molecular ordering using solvent vapour annealing techniques and also to better solar cell efficiency.

Graphical abstract: Cyclopentadithiophene organic core in small molecule organic solar cells: morphological control of carrier recombination

Supplementary files

Article information

Article type
Paper
Submitted
29 Nov 2016
Accepted
22 Dec 2016
First published
23 Dec 2016

Phys. Chem. Chem. Phys., 2017,19, 3640-3648

Cyclopentadithiophene organic core in small molecule organic solar cells: morphological control of carrier recombination

R. Domínguez, N. F. Montcada, P. de la Cruz, E. Palomares and F. Langa, Phys. Chem. Chem. Phys., 2017, 19, 3640 DOI: 10.1039/C6CP08166E

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