Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Inorganic-organic hybrid solar cells using perovskite materials such as methylammonium lead iodide (MAPbI3) and formamidinium lead iodide (FAPbI3) are received as one of potential future photovoltaic systems due to their low-cost solution fabrication process and high power conversion efficiency exceeding 20 % for widespread use in the world. Their potentiality is attributed to high quality perovskite crystals which are controlled on substrate by even solution process at low temperature. Because it is difficult to form a conformal perovskite film due to the self-assembly crystallization behavior of perovskites, key factor to achieve the high performance is how to make a high quality perovskite film on n(p)-type semiconductor layer. Although FAPbI3 has advantages such as smaller band gap, hysteresis-less property in n-i-p cell architecture, and more tolerance to decompose in humidity condition at high temperature compared to MAPbI3, most of studies on perovskite solar cells have focused on MAPbI3 due to a reversible phase transition of FAPbI3 between crystallographic polymorphs and absence of fabrication process to form compact and flat FAPbI3 film without secondary phases. In this talk, the compositional engineering to stabilize FAPbI3 perovskite phase and the developed process for FAPbI3 film for highly efficient perovskite solar cells will be introduced. We found that perovskite phase of FAPbI3 is stabilized by compositional engineering of FAPbI3 with incorporation of MAPbBr3. Moreover, we proposed intramolecular exchanging process to make high quality FAPbI3 based perovskite film using dimethylsulfoxide (DMSO) as a mediator to control crystallization of perovskite. The exchange of FAI with DMSO in pre-deposited PbI2(DMSO) film leads to crystallize into perovskite film with small volume expansion, preferred crystallographic orientation, and large grains, yielding to high power conversion efficiency of 20.1 % which is a certified value.
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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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