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Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer
CSIRO Energy Technology, PO Box 330, Newcastle, NSW 2304, Australia
Centre for Organic Electronics, University of Newcastle, Callaghan, NSW 2308, Australia
* Author to whom correspondence should be addressed.
Received: 7 October 2012; in revised form: 3 December 2012 / Accepted: 5 December 2012 / Published: 12 December 2012
Abstract: Organic solar cells have the potential to become a low-cost sustainable energy source. Understanding the photoconversion mechanism is key to the design of efficient organic solar cells. In this review, we discuss the processes involved in the photo-electron conversion mechanism, which may be subdivided into exciton harvesting, exciton transport, exciton dissociation, charge transport and extraction stages. In particular, we focus on the role of energy transfer as described by F¨orster resonance energy transfer (FRET) theory in the photoconversion mechanism. FRET plays a major role in exciton transport, harvesting and dissociation. The spectral absorption range of organic solar cells may be extended using sensitizers that efficiently transfer absorbed energy to the photoactive materials. The limitations of F¨orster theory to accurately calculate energy transfer rates are discussed. Energy transfer is the first step of an efficient two-step exciton dissociation process and may also be used to preferentially transport excitons to the heterointerface, where efficient exciton dissociation may occur. However, FRET also competes with charge transfer at the heterointerface turning it in a potential loss mechanism. An energy cascade comprising both energy transfer and charge transfer may aid in separating charges and is briefly discussed. Considering the extent to which the photo-electron conversion efficiency is governed by energy transfer, optimisation of this process offers the prospect of improved organic photovoltaic performance and thus aids in realising the potential of organic solar cells.
Keywords: organic solar cells; photovoltaic; exciton; FRET; energy transfer; photoconversion mechanism; review
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Feron, K.; Belcher, W.J.; Fell, C.J.; Dastoor, P.C. Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer. Int. J. Mol. Sci. 2012, 13, 17019-17047.
Feron K, Belcher WJ, Fell CJ, Dastoor PC. Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer. International Journal of Molecular Sciences. 2012; 13(12):17019-17047.
Feron, Krishna; Belcher, Warwick J.; Fell, Christopher J.; Dastoor, Paul C. 2012. "Organic Solar Cells: Understanding the Role of Förster Resonance Energy Transfer." Int. J. Mol. Sci. 13, no. 12: 17019-17047.