Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Publication date: 14th October 2019
Solution-processed hybrid perovskite solar cells (PSCs) have attracted considerable attention as a promising alternative for solar cells due to their high-power conversion efficiencies, easy fabrication, and low cost. Therefore, to achieve the practical use of PSCs, investigations have been conducted from various perspectives. A key component of PSCs is the hole-transporting layer (HTL), which plays a crucial role in achieving high performance by reducing charge recombination. Recently, several attempts have been made to demonstrate the potential of conjugated polymers as HTLs. In these conjugated polymer HTLs, frontier energy levels are controlled via modifying the side chain and substituting atoms in the aromatic rings. As a result, the compatibility of band alignment and the stability are improved.
In this study, we investigated a donor-acceptor conjugated polymer, poly[(2,5-bis(2-hexyldecyloxy)-phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c]-[1,2,5]-thiadiazole)] (PPDT2FBT)[1], as a HTL in PSCs. The overall power conversion efficiency of PSCs with PPDT2FBT as a HTL decreased compare to that of standard PSCs with spiro-OMeTAD. We introduced a surface passivation layer by spin-coating a formamidinium bromide (FABr) solution on an as-prepared perovskite film with the presence of excess PbI2.[2] PSCs treated with FABr solution showed higher open-circuit voltage and fill factor than those of untreated cells. This result indicates that the passivation layer prevents a backflow of holes from a HTL to the perovskite to suppress charge recombination.
This research was funded by the New Energy and Industrial Technology Development Organization (NEDO).
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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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