Van Der Waals Hybrid Perovskite of High Optical Quality by Chemical Vapor Deposition

4 years ago

Van Der Waals Hybrid Perovskite of High Optical Quality by Chemical Vapor Deposition

Toh-Ming Lu, Xin Sun, Yiping Wang, Jian Shi, Esther Wertz, Yang Hu, Yuwei Guo, Xi Wang, Hanwei Gao, Zhizhong Chen

2D hybrid perovksite (RNH3)2PbX4 materials not only serve as ideal platforms to study fundamental physics such as polariton dynamics but also show promise for optoelectronic and electro-optic applications. However, for the preparation of high optical quality crystals, mechanical exfoliation has to be applied in the past. In this work, the vapor phase growth of single crystalline (C4H9NH3)2PbI4 flakes with high optical quality is reported. Individual single crystalline domains show lateral size about 5–10 µm with defined rectangular shape. Spectroscopic studies show room temperature photoluminescence full width at half maximum of 70 meV and decay lifetime of several nanoseconds, indicating comparably high quality with mechanically exfoliated counterparts. Exciton binding energy 279 ± 46 meV and electron–phonon coupling strength around 20 meV are revealed. This vacuum-based method may provide a solution for integrating layered perovskites into optoelectronic devices and systems. Chemical vapor deposition of single crystalline 2D Ruddlesden–Popper (C4H9NH3)2PbI4 nanosheets with high optical quality is reported. Spectroscopic studies suggest comparably high quality with mechanically exfoliated counterparts. Exciton binding energy 279 ± 46 meV and electron–phonon coupling strength around 20 meV are revealed. The work promises the use of vapor phase grown 2D perovskite for optoelectronic applications.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adom.201700373