Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
α-Diketone-type photoprecursors of acenes can be quantitatively converted to corresponding acene compounds by visible-light irradiation. This photochemistry proceeds efficiently even in the solid state, and can be applied to the preparation of organic thin films of acene derivatives. Namely, one can solution-deposit an α-diketone-type precursor then convert it to an acene compound by in situ photoreaction. When the solubility of resulting thin films is sufficiently low, it is possible to deposit different materials sequentially by repeating the solution-deposition/photoreaction cycle. Here, the sequential deposition is highly challenging in conventional solution processes because of the dissolution of a lower layer(s) during the deposition of an upper layer.
In this study, we apply the photoprecursor approach to the preparation of active layers of organic photovoltaic cells (OPVs). Specifically, we construct p–i–n-type active layers in which a bulk-heterojunction (BHJ) layer (inter layer or i-layer) is sandwiched between p- and n-layers. In our test system, the photovoltaic efficiency of p–i–n devices is improved by more than three times as compared to that of the corresponding BHJ device, and a power conversion efficiency of 5.8% has been achieved thus far. The key is to use the right material in the right place. That is, high transparency and charge-carrier mobility are required for p- and n-layer materials, while good photoabsorption capability and miscibility are needed for i-layer materials. This presentation deals with the details of molecular design and synthesis, optimization of deposition conditions, and comparison of the photovoltaic performance between the BHJ and p–i–n devices. In addition, the p–i–n system will be compared to the corresponding p–i and i–n devices in order to separately examine the impacts of the p- and n-layers on the photovoltaic performance.
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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.
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