Issue 29, 2018

On the understanding of energetic disorder, charge recombination and voltage losses in all-polymer solar cells

Abstract

All polymer solar cells (all-PSCs), compared to fullerene or non-fullerene small molecule based solar cells possess the merits of high morphological stability, good film forming properties and superior mechanical flexibility. However, in contrast to the rapid progress in molecule-design and device engineering in this field, our fundamental insights into key photo-physical parameters that govern the device characteristics still lag behind. Here, based on state of the art PTzBI:N2200 all-PSCs with efficiencies of ∼9% compared with PBDB-T:N2200 all-PSCs, we investigate properties of charge transport, bimolecular recombination, energetic disorder and voltage losses. We show that expedited charge extraction with weaker bias-dependence in the PTzBI:N2200 cell results in the reduction of bimolecular recombination, which explains the increases in photocurrent and fill factor. Further mitigation of the voltage losses in this high performance all-polymer system may be allowed by decreasing the energetic disorder in PTzBI:N2200 bulk heterojunctions through delicate morphological optimization.

Graphical abstract: On the understanding of energetic disorder, charge recombination and voltage losses in all-polymer solar cells

Supplementary files

Article information

Article type
Paper
Submitted
03 6 2018
Accepted
29 6 2018
First published
29 6 2018

J. Mater. Chem. C, 2018,6, 7855-7863

On the understanding of energetic disorder, charge recombination and voltage losses in all-polymer solar cells

A. Yin, D. Zhang, S. H. Cheung, S. K. So, Z. Fu, L. Ying, F. Huang, H. Zhou and Y. Zhang, J. Mater. Chem. C, 2018, 6, 7855 DOI: 10.1039/C8TC02689K

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