Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Since the interface has great influence on performance of perovskite solar cell, understanding the details of PbI2 adsorption on carbon electrode is crucial for optimizing the performance of carbon based perovskite solar cells. Quartz crystal microbalance system (QCM) can monitor adsorbed mass in real time. In this work, we monitored the adsorption of PbI2 onto a carbon layer by QCM. The result shows that the mass of PbI2 adsorbed onto carbon layer increased with the increase concentration of PbI2 in N,N-Dimethylformamide (DMF). After rinsing by DMF, some of the PbI2 is still adsorbed on the carbon surface, suggesting that the interfacial structure bonded by chemical bonds. PbI2 binding was also verified by X-ray spectroscopy, X-ray photoelectron spectroscopy (XPS) result showed that part of the Pb-I reacts with the -OH on carbon surface and forming C-O-Pb linkages. Perovskite solar cell prepared by two-step method with a structure of TiO2 (perovskite)/ZrO (perovskite)/Carbon (perovskite) can form a passivation layer at the interface between carbon electrode and perovskite, achieves a higher power conversion efficiency than the same structure fabricate by one-step mothed. Our study demonstrate that carbon electrode passivated with PbI2 could reduce carrier recombination, resulting in improved the performance of perovskite solar cells. The QCM system is an important means to understand the interface structure of perovskite cells, providing important directions for future optimizing the device 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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
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