Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
In the pursuit of low-cost third generation solar cells, a major breakthrough has been achieved in the field of organo-lead halide perovskites for light harvesting in heterojunction solar cells. The optimum direct band gap, large absorption coefficient and high carrier mobility of these hybrid perovskites make them efficient for sufficiently high light-harvesting, charge separation and transport. Moreover, these pervoskites are easy to prepare by simple solution processing at temperatures < 150°C or by vapor deposition. Thus, these pervoskite solar cells seem to be very promising as solid state photovoltaic devices with high PCE > 10%. These heterojunction solar cells consist of a submicrometer, crystalline film of organo-lead iodide perovskite as the light absorber deposited on the surface of meso-structured titanium dioxide (TiO2) or aluminum oxide (Al2O3) layers and an organic hole conductor layer on top. ZnO is a viable alternative to TiO2 for these classes of solar cells due to its comparable energy levels as well as good electron transport properties, high degree of nanoparticle shape control (1D and 2D), and high electron mobility.
In this work, we present hybrid heterojunction solar cells from CH3NH3PbI3 perovskite and ZnO nanorod array. The optical properties of the perovskite coated ZnO nanorods as well as the photovoltaic properties of solar cells based on CH3NH3PbI3 Perovskite and ZnO nanorods will be presented. The devices have a structure; ZnO/Perovskite/organic hole conductor (spiro-OMeTAD). A series of solar cells were prepared by varying the length of ZnO nanorods and keeping the other layers constant. These devices are characterized under standard AM1.5 conditions. Scanning electron microscopy (SEM), UV-vis absorption, X-ray diffraction, and transmission electron microscopy are employed to characterize ZnO nanorods. Finally, these results are correlated with device data to observe the effects of ZnO nanorods engineering on device performance. We evaluated the influence of the nanorod length on the solar cell performance. Well-ordered 1-D structure of 1.3 to 1.5 micron nanorods delivered the optimum photovoltaic performance compared with the longer as well as shorter ZnO nanorod films.
Acknowledgement:Financial support by the Bavarian State Ministry of Science, Research, and the Arts for the Collaborative Research Network ‘‘Solar Technologies go Hybrid’’ is gratefully acknowledged
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