Low-Temperature Processed Brookite based TiO2 Phase Junction Electron Transport Layer for Efficient Planar Perovskite Solar Cells
Md Shahiduzzaman a b, Sem Visal c, Mizuki Kuniyoshi b, Tetsuhiro Katsumata c, Shinjiro Umezu d, Masato Kakihana e, Satoru Iwamori c, Tetsuya Taima a, Masao Isomura c, Koji Tomita b
a Nanomaterials Research Institute, Kanazawa University, Kanazawa 920-1192, Japan
b Department of Chemistry, School of Science, Tokai University, Kanagawa 259-1292, Japan
c Graduate School of Engineering, Tokai University, Kanagawa 259-1292, Japan
d Department of Modern Mechanical Engineering, Waseda University, Tokyo 169-8555, Japan
e Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, 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, Md Shahiduzzaman, 144
Publication date: 23rd October 2018

Facile electron extraction and transport are an important feature in electron transport layers (ETLs) for enhancing the efficiency of planar perovskite solar cells (PSCs). Herein, we consider the effects of different TiO2 polymorphs such as anatase and brookite. We design and fabricate high-phase purity and low-temperature (<180 °C) processed brookite based TiO2 heterophase junctions by comprising two phases in the differing phase on FTO-substrates, particularly, anatase–brookite (AB) and brookite–anatase (BA). We attempt to compare single-phase anatase (A) and brookite (B) and heterophase (AB) and (BA) as ETLs in PSCs. The power conversion efficiencies (PCEs) of PSCs with low-temperature processed single layer FTO-B as the ETL were as high up as 14.92% that is the top reported efficiency of single-layer FTO-B-based PSC.1 Consequently, the single layer FTO-B exhibits as an active phase and can be a potential candidate as an n-type ETL scaffold in planar PSCs. Ultimately, the champion device with heterophase junction FTO-AB structure ETL exhibited PCE of 16.82% that is higher to those of PSCs with FTO-A and FTO-B as the ETLs (13.86% and 14.92%, respectively). Furthermore, the PSCs with FTO-AB showed enhanced efficiency and significant decreased in J-V hysteresis compared with FTO-BA (13.45%) owing to the suitable match with the perovskite layer that resulted in higher capability of photogenerated charge carrier extraction and reduced charge accumulation at the interface of the heterophase junction/perovskite. Therefore, this work yields an effective strategy to develop heterophase junction ETLs and manipulating the interfacial energy band for further improving planar PSCs performance and enable clean, and eco-friendly fabrication of low-cost mass production.

1. Shahiduzzaman, M.; Visal, S.; Kuniyoshi, M.; Kaneko, T.; Umezu, S.; Katsumata, T.; Iwamori, S.; Kakihana, M.; Taima, T.; Isomura, M.; Tomita, K. Nano Lett. 2018.

This study was supported in part by Research and Study Project of Tokai University General Research Organization.

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