Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
The power conversion efficiency (PCE) of 11.7% in film based perovskite photovoltaic (PPV) module (703 cm2) have been developed and was shown in the latest Solar Cell Efficiency Tables (Version 53) [1]. Our module was composed of film/ITO/hole transport layer (HTL)/CH3NH3PbI3(MAPbI3)/PCBM/BCP/Ag.
Perovskite solar cells are one of the most promising candidates for the next generation solar cells because they exhibit not only high efficiencies but also low-cost due to the fabrication by roll-to-roll processes. For the coating processes of both buffer and photoactive layers for PPV modules, we have developed the “meniscus coating method” [2, 3] which is able to fabricate uniform and less thickness variation layers with large area.
Here, we adopted the two-step method for the fabrication of the perovskite photoactive layer because according to our experimental results, this method showed low variation of the PCEs compared to the one-step method. Also, the PPV modules with high PCE were demonstrated by not only investigating the experimental conditions of meniscus coating method but also the PbI2 and MAI solutions such as solvents and concentration.
Let us note that it is important to realize a low electrical resistance between the adjacent cells of the module structure by using a scribing technique for high PCE with the film based PPV modules. Typically, one could be suffer to achieve a low electrical resistance between the adjacent cells with film based solar modules because its substrate is soft and therefore can be easily damaged by the scribing blade. On the other hand, investigating the low pressure scribing experimental conditions thoroughly, we were able to eliminate a specific area of the layers composed of HTL/MAPbI3/PCBM on the ITO electrode without damaging both the electrode and film substrate. Additionally, reducing the series resistance of the ITO which was deposited on the film substrate also contributed to the high PCEs with the film based PPV modules.
Thus, using these technologies and experimental results, we have demonstrated the PCE of 11.7% in the official measurement by the national institute of Advanced Industrial Science and Technology (AIST) in film based PPV module with the designated area of 703 cm2.
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) project of “Development of high performance and reliable PV modules to reduce levelized cost of energy”.
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