Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Perovskite solar cells (PSC) have drawn a lot of attentions due to their high photoconversion efficiency and their easy, low-cost preparation. Yet, many challenging issues need to be addressed before they can reach their theoretical Shockley-Queisser efficiency and maintain the required stability under working conditions. Among different factors, interfacial effects are of great importance when it comes to influencing the stability and efficiency of such devices. Recent studies have shown that interaction of the perovskite materials with the substrate, highly impacts the electronic structure, and consequently all electronically affected properties. Electron transporting material (ETM) can affect the functioning of PSCs in different aspects via e.g. its chemical composition, its orientation with respect to the perovskite layer, etc. To be precise, electron injection can be energetically hindered when the bands of the perovskite and the substrate are mismatched. This can vary as a function of the nature of the compound and the geometry of the substrate. Moreover, possible trap states generated at the interface of the perovskite and substrate can also decrease the carrier life-time and carrier mobility. In a nut shell, to make the device function as efficiently as possible, the interaction of perovskite materials with the device interfaces needs to be well addressed and optimized to fine-tune properties and to reach maximal efficiency. To shed light on this, herein, we investigate the structural and electronic properties of the PSC at the DFT level by taking into account different possible configurations including methyl ammonium lead iodide (MAPbI3) and different facets of anatase (TiO2) as the ETM. Among all possible configurations of MAPbI3 and TiO2, we have identified distinctive configurations with considerably small cell mismatch. For each configuration, different terminations of MAPbI3 have been considered. We also investigate the effect of passivating undercoordinated surface atoms and the effect of approaching distance between the perovskite and the substrate on the electronic properties of the structure.
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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.
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