Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.017
Publication date: 27th October 2017
For highly developing field of organolead perovskite based solar cells, there is a fundamental question still stay mysterious. That is, the mechanism for charge separation. Unlike the p-n junction based solar cells, or the organic solar cells with bulk heterojunction, the thick working layers (300-500nm) of organolead perovskite themselves efficiently separate the electrons and holes, without noticeable internal morphology for separation and transportation. In addition, the density of carriers can be high, while it is quite strange that the recombination rate is extremely low. For well-prepared films, the lifetime for carriers can be up to 1 microsecond. The morphological basis for understanding such phenomena is still missing.
Recently, we developed a density-resolved spectroscopic method, for observing the photoproducts inside the films. The firm experimental proof shows that the commonly accepted exciton-free carrier co-existing model is only true in non-heated samples and single crystals. For working layers in real devices, which experience heat annealing as a general step, a significant exciton-carrier collision replace the co-existence. According to the photoproduct-morphology relationship, it indicates the tetragonal phase of perovskite crystalline structure has new subgrain structure after heat annealing. To our knowledge, this is the only report discovering the generality of subgrain structure in real working layers. Then it provides the basis for mechanism analysis starting from a new level of morphology. The new photoproduct relation, subgrain morphology, and relative analysis show that the subgrain structure is possibly the key to solve the mystery.
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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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