Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.013
Publication date: 27th October 2017
Research of perovskite solar must be directed to ensure compatibility of stable efficiency and high durability for practical applications.1 Industrialization requires large area manufacture process, in which sinter-less high-speed coating technology enables remarkable reduction of process cost. We have been focused on low temperature fabrication process using heat-resistant metal oxide materials. I-V hysteresis of the metal oxide-based cells was improved by ensuring void-less high quality interfaces of perovskite crystals in contact with charge transport layers, which suppress recombination and enable high voltage output. Using TiO2 as electron transporter, triple-cation based perovskite cells give hysteresis-free high performance with efficiency of 20-21%, which is reproduced under ambient air fabrication processes.2 High open-circuit voltage (Voc) of perovskite cells (1.1-1.2V vs band gap energy of 1.6 eV) is the advantage superior to existing solar cells. Intensity dependence of Voc shows that ideality factor of perovskite solar cells is in a range of 1.4 to 1.9, depending on the structure and size of cell.2 Ideality factor high enough over 1.0 indicates the presence of trap-assisted charge recombination. In other word, there is still a room to improve Voc and efficiency.
Heat tolerant and durable device that industrialization requires can be made by using MA-free perovskite such as CsFAPbI3 and CsFAPbI3-xBrx. Low-temperature process is applicable to Cs/FA perovskites. Stable and hysteresis-less high efficiency (>18%) was obtained by aging of the device in suitable dry atmosphere.3 When low temperature fabrication was applied to thin plastic film as substrate, perovskite solar cell achieves efficiency over 17% by tuning the quality of TiO2 compact and mesoporous layer.4 Perovskite solar cell fully made by low temperature processes yielded stable high efficiency over 21% with Voc of 1.18V. Stability of the device also largely depends on the qualities of hole transporting material. We chose P3HT as heat-resistant material and examined the cell stability against impacts of temperature changes (-100 to +100oC) and radiation of high energy electron and proton beams. Despite low efficiency compared to spiro-OMeTAD, device showed high stability to corroborate the heat and radiation tolerance of perovskite solar cells.
[1] N. -G. Park, M. Gratzel, T. Miyasaka, K. Zhu, and K. Emery, Nature Energy, 2016, 1, 16152.
[2] T. Singh and T. Miyasaka, Adv. Energy Mat., 2017, 1700677.
[3]Y. Numata, Sanehira, and T. Miyasaka, submitted.
[4] T. Singh and T. Miyasaka, submitted.
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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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