Establishing charge-transfer excitons in 2D perovskite heterostructures

Zhang, Jia; Zhu, Xixiang; Wang, Miaosheng; Hu, Bin

doi:10.1038/s41467-020-16415-1

Establishing charge-transfer excitons in 2D perovskite heterostructures

Journal Article · Tue May 26 00:00:00 EDT 2020 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-16415-1· OSTI ID:1816873

^[1]; Zhu, Xixiang ^[2]; ^[3]; ^[3]

Beijing Jiaotong Univ. (China). Optical Information Ministry of Education. Key Lab. of Luminescence; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; OSTI
Beijing Jiaotong Univ. (China). Optical Information Ministry of Education. Key Lab. of Luminescence; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering

Charge-transfer excitons (CTEs) immensely enrich property-tuning capabilities of semiconducting materials. However, such concept has been remaining as unexplored topic within halide perovskite structures. Here, we report that CTEs can be effectively formed in heterostructured 2D perovskites prepared by mixing PEA₂PbI₄:PEA₂SnI₄, functioning as host and guest components. Remarkably, a broad emission can be demonstrated with quick formation of 3 ps but prolonged lifetime of ~0.5 μs. This broad PL presents the hypothesis of CTEs, verified by the exclusion of lattice distortion and doping effects through demonstrating double-layered PEA₂PbI₄/PEA₂SnI₄ heterostructure when shearing-away PEA₂SnI₄ film onto the surface of PEA₂PbI₄ film by using hand-finger pressing method. The below-bandgap photocurrent indicates that CTEs are vital states formed at PEA₂PbI₄:PEA₂SnI₄ interfaces in 2D perovskite heterostructures. Electroluminescence shows that CTEs can be directly formed with electrically injected carriers in perovskite LEDs. Clearly, the CTEs presents a new mechanism to advance the multifunctionalities in 2D perovskites.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1816873

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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