Near infrared up-conversion in organic photovoltaic devices using an efficient Yb3+:Ho3+ Co-doped Ln2BaZnO5 (Ln = Y, Gd) phosphor
Curry, RJ, adikaari, , silva, S, etchart, I, Guering, P, Berard, M and cheetham, A (2012) Near infrared up-conversion in organic photovoltaic devices using an efficient Yb3+:Ho3+ Co-doped Ln2BaZnO5 (Ln = Y, Gd) phosphor Journal of Applied Physics, 111 (9), 094502.
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The first detailed study that combines the use of a new generation of high-efficiency Yb3+:Ho3+ co-doped Y2BaZnO5 near-infrared up-converting phosphors with organic photovoltaic devices is reported. We show that it is possible to obtain a Jsc of 16 µA / cm2 under 986 nm illumination (~390 mW / cm2 corresponding to ~37 suns) leading to an up-conversion external quantum efficiency (UC EQE) of 0.0052%. Through modification of the organic photovoltaic devices to incorporate transparent electrodes we show that UC EQE could be increased to 0.031 %, matching that achieved in amorphous-Si:H PV cells. Accounting for the full spectral range that may be absorbed by the phosphor(~870–1030 nm) yields an up-conversion power conversion efficiency (UC PCE) of 0.073% which again could be improved to 0.45% using transparent electrodes. This technique for utilizing the near-infrared spectral region may therefore offer a potential route to improving the performance of organic photovoltaic devices as research into discovering high-efficiency up-converting phosphors continues to provide improved materials.
|Divisions :||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre|
|Identification Number :||10.1063/1.4704687|
|Additional Information :||
Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
The following article appeared in Applied Physics Letters, 111 (9) 094502 and may be found at R. J. Curry et al., Appl. Phys.Lett. 111, 094502 (2012)
|Depositing User :||Symplectic Elements|
|Date Deposited :||11 Jun 2012 16:10|
|Last Modified :||23 Sep 2013 19:27|
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