Publication date: 10th April 2014
Lead halide perovskite derivatives1 (CH3NH3PbX3, X= Cl, Br, I) have become very promising materials for photovoltaics during the last two years due to their relatively easy processability, high light absorption coefficients, excellent electrical properties and most importantly, the recent steep rate of improvement in perovskite solar-cell performance, which reaches values of power conversion efficiency as high as 15-16% up to date.2 The rapid advance of the perovskite solar-cell technology could presage that in the next years, the power conversion efficiency will approach its theoretical maximum value. Thus, additional strategies aimed to overcome this limitation are needed to be exploited: i) broadening of the light harvesting absorption range of the perovskite films; or ii) preparation of tandem configuration devices; among others.In this work, we focus on the first approximation and propose the combination of lead perovskite materials together with up-converting materials as an appealing mechanism to further extend the absorption of sub-bandgap photons through multi-photon transitions. In this context, the use of lanthanide up-converting (UC) nanocrystals, which are able to transform infrared photons into visible radiation, opens new exciting opportunities to develop more efficient devices. The most studied UC systems to date involve lanthanide (Yb3+, Er3+, Tm3+) doped fluoride or oxide materials. Herein, we report for the first time, up to our knowledge, the integration of Er3+/Yb3+ codoped yttrium oxide (Y2O3) nanoparticles with outstanding UC properties, into perovskite based devices with the aim of extending the spectral range of photon to current functionality.
Bibliography:
1) Snaith, H. J. Phys. Chem. Lett. 2013, 4, 3623.
2) http://www.nrel.gov/ncpv/images/efficiency_chart.jpg
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