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Issue 36, 2015
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A dual ternary system for highly efficient ITO-free inverted polymer solar cells

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Abstract

In this study, it has been found that a very fine nanostructure can be realized by mixing 1-chloronaphthalene (CN) – a high-boiling solvent – into a binary chlorobenzene (CB) : 1,8-diiodooctane (DIO) solvent mixture to form a ternary solvent system. An improvement in energy level alignment is also obtained by doping ICBA into a binary PTB7 : PCBM[70] blend, whereby the ternary solute system provides a new pathway for charge transfer from PTB7 to the PCBM[70] : ICBA alloy. This is confirmed by imaging the surface morphology of the active layer using AFM and TEM, monitoring the transient film formation process and measuring the charge transfer states with Fourier transform photocurrent spectroscopy. An encouraging PCE of 7.65% is achieved from the dual ternary system, which is the highest value ever reported for an ITO-free inverted polymer solar cell with a PEDOT:PSS layer as the top semitransparent electrode – a system which is compatible with low-cost large-area roll-to-roll manufacturing.

Graphical abstract: A dual ternary system for highly efficient ITO-free inverted polymer solar cells

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Supplementary files

Article information


Submitted
27 May 2015
Accepted
21 Jul 2015
First published
23 Jul 2015

J. Mater. Chem. A, 2015,3, 18365-18371
Article type
Communication
Author version available

A dual ternary system for highly efficient ITO-free inverted polymer solar cells

Z. Peng, Y. Xia, F. Gao, K. Xiong, Z. Hu, D. I. James, J. Chen, E. Wang and L. Hou, J. Mater. Chem. A, 2015, 3, 18365
DOI: 10.1039/C5TA03831F

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