Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Among the recent developments in perovskite solar cells, one thing that has been promient and promising is simultaneous improvement in efficiency and stability of the cells, which has been accomplished by essentially improving the structural (intrinsic) stability of the perovskites through mixing different cations and/or anions in the perovskite structure. However, the overall stability of cells depend on other layers like hole transport layer, electron transport layer and their interfaces with the perovsktie. In fact, in a recent study on thermal stability of regular MAPbI3 solar cells, we found that spiro-OMeTAD plays a notorious role in performance deterioration of the cells at elevated temperature (60, 80, 100 and 120 oC). It seems that, not the degradation of MAPbI3 (trace of PbI2) but some physical/chemical alteration at the perovskite/spiro-OMeTAD interface is the main reason for performance degradation in the MAPbI3 cells, because performance decreased only when the MAPbI3 films with spiro-OMeTAD on its top were heated at different temepratures while it remained unchanged when the MAPbI3 films wihtout the spiro-OMeTAD were heated at same conditions (slight degradation to PbI2). Having found this, we then explored the effects of surface modification of MAPbI3 with cation precursors like FAI, CsI, MAI, MABr etc. on thermal stability of the MAPbI3 cells. As a result of such surface modification, thermal stability of the cells improved significantly. For instance, cells made with FAI-treated MAPbI3 films showed much less degradation in performance as comapred to pure MAPbI3 and MAI-treated MAPbI3 cells when they were heated at 80, 100 and 120 oC for 1 h. Indeed, MAI-treated MAPbI3 cells were found to be worse in comparison to regular MAPbI3 cells, which implies certain involvement of MA+ ions in altering the interface between MAPbI3 and spiro-OMeTAD. In addtion, effect of exposure of the perovskite films surface to different environments like O2, N2 and vacuum on performace and stability was investigated. The results also show reasonbale influence of such post-treatment of MAPbI3 surface on performance and long term stability of the 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.
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