NDLI: Enhanced charge separation in organic photovoltaic films doped with ferroelectric dipoles

Content Provider	Royal Society of Chemistry (RSC)
Author	Kodali, Hari K. Carr, John A. Ganapathysubramanian, Baskar Petrich, Jacob W. Nalwa, Kanwar S. Mahadevapuram, Rakesh C. Chen, Yuqing Bose, Sayantan Chaudhary, Sumit
Copyright Year	2012
Abstract	A key requirement for realizing efficient organic photovoltaic (OPV) cells is the dissociation of photogenerated electron-hole pairs (singlet-excitons) in the donor polymer, and charge-transfer-excitons at the donor–acceptor interface. However, in modern OPVs, these excitons are typically not sufficiently harnessed due to their high binding energy. Here, we show that doping the OPV active-layers with a ferroelectric polymer leads to localized enhancements of electric field, which in turn leads to more efficient dissociation of singlet-excitons and charge-transfer-excitons. Bulk-heterojunction OPVs based on poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester are fabricated. Upon incorporating a ferroelectric polymer as additive in the active-layer, power conversion efficiencies increase by nearly 50%, and internal quantum efficiencies approach 100% – indicating complete exciton dissociation at certain photon energies. Similar enhancements in bilayer-heterojunctions, and direct influence of ferroelectric poling on device behavior show that improved dissociation is due to ferroelectric dipoles rather than any morphological change. Enhanced singlet-exciton dissociation is also revealed by photoluminescence lifetime measurements, and predicted by simulations using a numerical device model.
Starting Page	7042
Ending Page	7049
Page Count	8
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	5
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/c2ee03478f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	OPV Solar cell Dissociative Polymer Binding energy Dopant Ferroelectricity Electric field Polythiophene Phenyl-C61-butyric acid methyl ester Acid Ester Quantum Exciton Photon Photoluminescence
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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