Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The recent employment of self-assembling hybrid halide perovskite in solar converting devices has been depicted as the “Next Big Thing in Photovoltaics”.2 However, despite the rapid increase in efficiency associated with the evolution of this technology, many of the fundamental questions concerning the material properties affecting device operation remain unanswered.3 In particular, further developments of this technology, require a rationalization of the carriers generation and transport mechanisms for all the diverse device configurations in which perovskite has been embedded. Here we propose a picture for carriers generation and recombination in highly efficient (CH3NH3)PbI(3-x)Clx perovskite-based solar cells employing TiO2 as mesoporous substrate and spiro-OMeTAD as solid state hole transporting material. Time Correlated Single Photon Counting, Photoinduced Absorption and Transient PhotoVoltage measurements, were selected as direct investigative tools for the determination of such phenomena in model systems and working devices.The collection of our results depicts a peculiar behaviour for charge generation and dynamics, as the presence of two n-type materials, TiO2 and perovskite, generates alternative paths for electron transport. The important new insights, contained in this work, would help the comprehension of these innovative devices suggesting potential design improvements.
Resuming cartoon describing the complementary carriers percolation paths in halide perovskite-sensitized mesostructured solar cells
1. Roiati V.; Colella S.; Lerario G.; De Marco L.; Rizzo A.; Listorti A.*; Gigli G. Investigating charge dynamics in halide perovskite sensitized mesostructured solar cells. Submitted 2013. 2. Bisquert, J.; The Swift Surge of Perovskite Photovoltaics. J. Phys. Chem. Lett. 2013, 2597–2598. 3. Snaith, H. J. Perovskites : The Emergence of a New Era for Low-Cost , High-. J. Phys. Chem. Lett. 2013, 4, 3623−3630.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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