Issue 9, 2012
From the journal:

Energy & Environmental Science

Understanding the effect of ferroelectric polarization on power conversion efficiency of organic photovoltaic devices

Yongbo Yuan,†ab   Pankaj Sharma,†bc   Zhengguo Xiao,†ab   Shashi Poddar,bc   Alexei Gruverman,bc   Stephen Ducharmebc  and  Jinsong Huang*ab  

* Corresponding authors

a Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0656, USA
E-mail: jhuang2@unl.edu

b Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68583-0298, USA

c Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0299, USA

Abstract

It is demonstrated that the power conversion efficiency (PCE) of organic photovoltaic devices can be increased by inserting an ultrathin film of a ferroelectric co-polymer, poly(vinylidenefluoride-trifluoroethylene) (P(VDF-TrFE)), at the metal–organic interface, due to an enhancement of the charge extraction efficiency. Specifically, the effect of P(VDF-TrFE) crystallinity on its function in ferroelectric organic photovoltaic (FE-OPV) devices has been studied by several methods. Highly crystalline and amorphous P(VDF-TrFE) films have been prepared by the Langmuir–Blodgett method and spin-coating from acetone solution, respectively. The polymer solar cell devices with a crystalline P(VDF-TrFE) interfacial layer at the cathode have larger PCE than the structures with amorphous P(VDF-TrFE) and have the unique feature of switchable diode polarity and photovoltaic performance controlled by external applied voltage pulses. The obtained results confirm that the spontaneous polarization of the ferroelectric P(VDF-TrFE) layer is responsible for the enhancement of PCE in FE-OPV devices and that a highly crystalline ferroelectric polymer film is required to observe the enhancement of PCE. Amorphous P(VDF-TrFE) films act as regular dielectric layers with a little poling effect on device PCE. The polarization of P(VDF-TrFE) is shown to be stable, and the photogenerated charges could be collected efficiently by the cathode rather than being compensated.

Graphical abstract: Understanding the effect of ferroelectric polarization on power conversion efficiency of organic photovoltaic devices

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Article information

DOI
https://doi.org/10.1039/C2EE22098A
Article type
Paper
Submitted
30 Apr 2012
Accepted
29 May 2012
First published
12 Jul 2012

Energy Environ. Sci., 2012,5, 8558-8563

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Understanding the effect of ferroelectric polarization on power conversion efficiency of organic photovoltaic devices

Y. Yuan, P. Sharma, Z. Xiao, S. Poddar, A. Gruverman, S. Ducharme and J. Huang, Energy Environ. Sci., 2012, 5, 8558 DOI: 10.1039/C2EE22098A

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