The breakthrough discovery of superior photovoltaic performances in organo-lead halide perovskite materials shed new light on developing high-efficiency, low-cost, large-scale solar cells. The power conversion efficiency (PCE) of organo-lead halide perovskite solar cells have been skyrocketing from a pioneering value of 3.8 % to a series of certified values approaching 20% in the past 5 years,1-2 mainly through the modification of chemical components, the design of new device architectures, and the engineering of functional interfaces of perovskite solar cells.3-6 The optoelectronic activities of organo-lead halide perovskites are highly correlated with their electronic structures, in which the absorption onset of prototypical CH3NH3PbI3 perovskite is limited to ~1.5 eV making the material not able to absorb the incident light over 800 nm and eventually lower the device efficiency.7 Herein, we report a strategy of promoting the photovoltaic performances of CH3NH3PbI3 perovskite solar cells by the incorporation of up-conversion nanoparticles (i.e., NaYF4:Yb/Er), which generally convert near-infrared (NIR) light to visible high-energy light (i.e., green). It is noteworthy that these hydrophilic monodisperse up-conversion nanoparticles were synthesized by the multi-arm star-like block copolymer nanoreactor technique recently developed in our group.8

High performance organo lead halide perovskite solar cells by incorporating monodisperse upconversion nanocrystals

249th National Meeting (2015)

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