Brookite TiO2-Based High Performance Perovskite Solar Cells by Low Temperature Fabrication
Yoshitaka Sanehira a, Masashi Ikegami a, Tsutomu Miyasaka a, Atsushi Kogo a
a Toin University of Yokohama, 1614 Kurogane-cho, Aoba, Yokohama, 2258503, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, Atsushi Kogo, 135
Publication date: 7th November 2016

Building solar cells on a flexible plastic film is an important issue for roll to roll mass production and wearable devices. For this purpose, low temperature fabrication process of perovskite solar cells has been intensively studied.Although fullerene derivatives and ZnO, which can be prepared at low temperature, are often used as electron collectors of flexible solar cells, cheap and stable metal oxides are more desirable. Here, we have developed brookite TiO2 mesoporous layer prepared at oC as an electron collector. Although conventional anatase TiO2 requires an organic binder in the mesoscopic precursor paste, which is to be removed by sintering at ~500 oC, to ensure inter-particle necking and the adhesiveness of TiO2 nanoparticles on a conductive glass, the brookite TiO2 layer can be formed at oC low temperature from a binder-free slurry based on dehydration reaction of surface hydroxyl groups between nanoparticles. The mesoporous brookite layer with high hydrophilicity works as an effective scaffold for crystal growth of CH3NH3PbI3-xClx perovskite film with high coverage and large crystal size compared to anatase TiO2 and leads to hysteresis-less and higher photovoltaic performance. In combination with amorphous metal oxide hole-blocking layer, the brookite electron collector enables 18.9% power conversion efficiency for perovskite solar cells prepared at low temperature on ITO glass substrates. Furthermore, with amorphous tin oxide blocking layer, the flexible brookite-based perovskite solar cells formed on plastic films give efficiency up to 14% with hysteresis-less property. The flexible cells exhibited high mechanical stability against repeated bending with radius of 1.5 cm.

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