Giant fine structure splitting of the bright exciton in a bulk MAPbBr3 single crystal

Nano Letters American Chemical Society 19:10 (2019) 7054-7061

Authors:

M Baranowski, K Galkowski, A Surrente, JM Urban, Ł Klopotowski, S Mackowski, DK Maude, R Ben Ben Aich, K Boujdaria, M Chamarro, C Testelin, Pabitra Nayak, M Dollmann, HJ Snaith, Robin Nicholas, P Plochocka

Abstract:

Exciton fine structure splitting in semiconductors reflects the underlying symmetry of the crystal and quantum confinement. Since the latter factor strongly enhances the exchange interaction, most work has focused on nanostructures. Here, we report on the first observation of the bright exciton fine structure splitting in a bulk semiconductor crystal, where the impact of quantum confinement can be specifically excluded, giving access to the intrinsic properties of the material. Detailed investigation of the exciton photoluminescence and reflection spectra of a bulk methylammonium lead tribromide single crystal reveals a zero magnetic field splitting as large as ~200μeV. This result provides an important starting point for the discussion of the origin of the large bright exciton fine structure observed in perovskite nanocrystals.

Crystallographic and Theoretical Investigations of Er2@C2 n (2 n=82, 84, 86): Indication of Distance‐Dependent Metal–Metal Bonding Nature

Chemistry - A European Journal Wiley 25:49 (2019) 11538-11544

Authors:

Shuaifeng Hu, Wangqiang Shen, Le Yang, Guangxiong Duan, Peng Jin, Yunpeng Xie, Takeshi Akasaka, Xing Lu

A highly effective superfluid film breaker for high heat-lift 1 K sorption coolers

Cryogenics Elsevier 102 (2019) 45-49

Authors:

Andrew J May, Gabriele Coppi, Vic Haynes, Simon Melhuish, Lucio Piccirillo, Tiago Sarmento, Sam Teale

Fabrication of Efficient and Stable CsPbI3 Perovskite Solar Cells through Cation Exchange Process

Advanced Energy Materials Wiley 9:36 (2019)

Authors:

Cho Fai Jonathan Lau, Zhiping Wang, Nobuya Sakai, Jianghui Zheng, Chwen Haw Liao, Martin Green, Shujuan Huang, Henry J Snaith, Anita Ho‐Baillie

Interfacial charge-transfer doping of metal halide perovskites for high performance photovoltaics

Energy and Environmental Science Royal Society of Chemistry (2019)

Authors:

Nakita Noel, Habisreutinger, A Pellaroque, F Pulvirenti, Bernard Wenger, F Zhang, Yen-Hung Lin, OG Reid, J Leisen, Y Zhang, S Barlow, Marder, A Kahn, HJ Snaith, CB Arnold, BP Rand

Abstract:

We demonstrate a method for controlled p-doping of the halide perovskite surface using molecular dopants, resulting in reduced non-radiative recombination losses and improved device performance.