Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Perovskite solar cells (PSCs) are a promising new class of photovoltaic devices, achieving lab scale efficiencies comparable to silicon based solar cells. Besides the up-scaling from lab scale fabrication to module production, the long term stability of these devices has become the most important impediment to commercial application. As a result, the PSC field is shifting from improving the efficiency of PSCs, to enhancing the long term stability.
The electron selective contact is a key component of the PSC, usually consisting of a metal oxide semiconductor. The most efficient PSCs to date use titanium dioxide (TiO2) as the electron selective contact. However, it was found that TiO2 is electronically unstable and is photo catalytically active when exposed to full spectrum solar radiation and PSCs employing TiO2 rapidly lose more than 20% of their initial efficiency.
In my talk I will present my work towards UV-stable perovskite solar cells. Initially I address the instability of TiO2 by doping. Although this helps to improve stability, it cannot completely eliminate UV-induced performance loss. I will go on to show that this stability problem can be circumvented by replacing TiO2 with tin dioxide (SnO2), a metal oxide with semiconducting properties similar to TiO2, but with a larger bandgap, which leads to the material being less susceptible to light induced degradation. SnO2 based PSCs do not show the rapid degradation upon exposure to full spectrum solar light that is characteristic of TiO2 based devices.
The major downside of using SnO2 so far, has been the relatively low efficiency; typically less than 10%, compared to TiO2 based PSCs reaching efficiencies over 20%. I showed that this poor efficiency was partially caused by the choice of electrode. By employing a different electrode material (aluminium doped zinc oxide), instead of the standard fluorine doped tin oxide, the efficiency of SnO2 based PSCs could be increased to 12.5%.2 Modifying the properties of SnO2 by doping with gallium further increases the efficiency to 17%, a value that is identical to TiO2 based PSCs fabricated in our lab, paving the way for more stable perovskite solar cells.
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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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.