Perovskite Solar Cells from Fundamental Issues to Advanced Concepts

Ivan Mora-Sero^a

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)

Swansea, United Kingdom, 2016 June 29th - July 1st

Organizers: James Durrant, Henry Snaith and David Worsley

Invited Speaker Session, Ivan Mora-Sero, presentation 099
Publication date: 28th March 2016

Halide Perovskite are probably the current hottest materials for photovoltaics. Certified photoconversion efficiencies as high as 22.1% has been reported. In addition, can be prepared from solution methods at low temperature, and consequently they can be fabricated without large and expensive facilities, and can be easily combined with other materials. However despites the unprecedentedly fast increase of the reported efficiencies, especially in the last four years, the working mechanisms of this kind of devices are not completely understood. As example the cells with the highest efficiency reported presents a thin TiO2 scaffold with a thicker perovskite capping layer, but it is not completely clear why this configuration provides such high efficiency with suppression of hysteresis effect. Transport, recombination, injection at the contacts or J-V curve hysteresis are strongly dependent on the cell configuration, as the use of scaffold, the perovskite and contact materials and also on the growth conditions. In this talk, I analyze the effect of different electron selective contacts, in the solar cell performance. In addition, I show the effect of different scaffold configuration in the properties of the device by a systematic optoelectronic characterization.

Finally, I analyze the fact that to obtain efficiencies as the ones reported for Perovskite Solar Cells (PSCs) it is needed a low non-radiative recombination, allowing the development of light emitting systems. In addition, the interaction among materials of different nature can produce interesting synergies that might be beneficial, not simply by improving a feature, but also giving rise to new properties or phenomena that do not exist for the single materials. The interaction between hybrid lead halide perovskite (CH3NH3PbI3) and quantum dots (core/shell PbS/CdS) is presented.1 Interaction between QDs and perovskite has enormous potentialities.1-3 We report for the first time the observation of exciplex state electroluminescence from the combination of both materials. The presence of the exciplex state of perovskite and QDs opens up a broad range of possibilities with important implications in tunable LEDs but also in the preparation of intermediate band gap photovoltaic devices with the potentiality of surpassing the Shockley-Queisser (SQ) limit.

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International Conference on Hybrid and Organic Photovoltaics

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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