Control of Interface And Crystal Structures Toward Efficient Perovskite Solar Cells
Saemi Takahashi a, Satoshi Uchida b, Hiroshi Segawa a
a Department of General System Studies, Graduate School of Arts And Science, The University of Tokyo, Japan
b Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Poster, Saemi Takahashi, 150
Publication date: 23rd October 2018

Due to the higher expansion coefficient of perovskite than TiO2, an interfacial stress is created at the interface of TiO2 and perovskite layer, which causes the lattice mismatches. It has been already reported that the charge trapping / detrapping and/or charge accumulation caused by the voids of the interface acts as capacitors, which may affect I-V hysteresis.

Since the modification of the interfaces is considered to have a direct or indirect effect on device characteristics, in this research, we have examined the cell performance by fabricating perovskite solar cells with FTO (fluorine-doped tin oxide) substrates having different roughness. Surprisingly, I-V curves showed a big difference between rough and flat substrates. The cell prepared by flat FTO substrate showed better efficiency with smaller hysteresis than the rough FTO substrate. Also, according to SEM observation, it was found that much less grain boundaries were observed in the sample fabricated with flat FTO. This result points out that not only the interfaces but grains in perovskite crystals may also affect solar cell efficiency and hysteresis.

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