2025-03-07 早稲田大学
＜関連情報＞
- https://www.waseda.jp/inst/research/news/79861
- https://www.tsukuba.ac.jp/journal/pdf/p20250307140000.pdf
- https://onlinelibrary.wiley.com/doi/10.1002/anie.202424391
ヘリカル一次元ハロゲン化鉛ペロブスカイトに基づくキラル極性結晶における巨大バルク光起電力効果 Giant Bulk Photovoltaic Effect in a Chiral Polar Crystal based on Helical One-dimensional Lead Halide Perovskites
Prof. Ayumi Ishii, Ryohei Sone, Tomohide Yamada, Mizuki Noto, Hikari Suzuki, Daiki Nakamura, Dr. Kei Murata, Prof. Takuya Shiga, Prof. Kazuyuki Ishii, Prof. Masayuki Nihei
Angewandte Chemie International Edition Published: 29 January 2025
DOI:https://doi.org/10.1002/anie.202424391
Graphical Abstract
Helical 1D lead halide perovskites crystallized in the polar C2 space group demonstrate strong circular dichroism and achieve an extraordinary 15 V open-circuit voltage via the bulk photovoltaic effect (BPVE). This work highlights low-dimensional crystal symmetry engineering as a transformative approach for designing high-performance BPVE materials.
Abstract
Chiral polar crystals composed of one-dimensional (1D) conducting materials exhibit unique physical phenomena. The present study focused on helical 1D-structured lead halide perovskite derivatives with chiral naphthylethylamine as organic cations, (R or S-NEA)[PbI3](R-NEA=R-(+)-1-(1-naphthyl)ethylamine, S-NEA=S-(−)-1-(1-naphthyl)ethylamine). A thermally controlled crystallization method has successfully yielded crystals with a polar chiral space group of C2. The crystals show significantly intense signals of circular dichroism (CD) originating from the asymmetrical electronic transition characteristic of helical 1D structure. In addition, generation of an anomalous zero-bias photocurrent (bulk photovoltaic effect (BPVE)) was observed with an open-circuit voltage up to 15 V, which is five times larger than the band gap. This study suggests that parallel arrangements of the helical semiconducting materials are the promising way to obtain chiral polar crystal exhibiting high performance BPVE.
