CsPbBr₃ Perovskite Nanocrystal Grown on MXene Nanosheets for Enhanced Photoelectric Detection and Photocatalytic CO₂ Reduction

Journal Article · Wed Oct 09 00:00:00 EDT 2019 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.9b02605· OSTI ID:1599813

Pan, Aizhao  ^[1]; Ma, Xiaoqin ^[1]; Huang, Shengying ^[1]; Wu, Youshen ^[1]; Jia, Mengjun ^[1]; Shi, Yeming ^[2]; Liu, Ya ^[3]; Wangyang, Peihua ^[2]; He, Ling  ^[1]; Liu, Yi  ^[4]

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1. Xi'an Jiaotong Univ., Shaanxi (China). Dept. of Chemistry
2. Chengdu Univ. of Information Technology, Chengdu (China). College of Optoelectronic Technology
3. Xi'an Jiaotong Univ., Shaanxi (China). International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering
4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). The Molecular Foundry

All-inorganic CsPbX₃ (X = Cl, Br or I) perovskite nanocrystals have attracted extensive interest recently due to their exceptional optoelectronic properties. In an effort to improve the charge separation and transfer following efficient exciton generation in such nanocrystals, novel functional nanocomposites were synthesized by the in situ growth of CsPbBr₃ perovskite nanocrystals on two-dimensional MXene nanosheets. Efficient excited state charge transfer occurs between CsPbBr₃ NCs and MXene nanosheets, as indicated by significant photoluminescence (PL) quenching and much shorter PL decay lifetimes compared with pure CsPbBr₃ NCs. The as-obtained CsPbBr₃/MXene nanocomposites demonstrated increased photocurrent generation in response to visible light and X-ray illumination, attesting to the potential application of these heterostructure nanocomposites for photoelectric detection. The efficient charge transfer also renders the CsPbBr₃/MXene nanocomposite an active photocatalyst for the reduction of CO₂ to CO and CH₄. This work provides a guide for exploration of perovskite materials in next-generation optoelectronics, such as photoelectric detectors or photocatalyst.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1599813
• Journal Information: Journal of Physical Chemistry Letters, Vol. 10, Issue 21; ISSN 1948-7185
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Charge transfer
Two dimensional materials
Nanocomposites
Photoluminescence
Transmission electron microscopy