Crystal structures and photoluminescence characteristics of cesium lead bromide perovskite nanoplatelets depending on the antisolvent and ligand used in their syntheses

Yandri, Valdi Rizki; Nurunnizar, Adhita Asma; Debora, Rima; Wulandari, Priastuti; Nursam, Natalita Maulani; Hidayat, Rahmat; Indari, Efi Dwi; Yamashita, Yoshiyuki

doi:10.1016/j.heliyon.2023.e23276

Cited by 2 publications

(1 citation statement)

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“…This finding is in concordance with the Hg-I bond separation, as inferred from the Hg 4f orbital signal, thus affirming the structural integrity of the bonds. Figure 5d-f illustrate orbital signals for Cs-3d, Pb-4f, and Br-3d detected in the quantum dots film after ligand exchange [27][28][29][30], conclusively evidencing the formation of perovskite within the heterostructure. The AFM and FESEM images in Figure 4a,b demonstrate the compact surface, uniform grain size, and relatively flat nature of the HgSe/CsPbBrxI3−x quantum dot film after ligand exchange.…”

Section: Resultsmentioning

confidence: 77%

Heterojunctions of Mercury Selenide Quantum Dots and Halide Perovskites with High Lattice Matching and Their Photodetection Properties

Yu,

Shan,

Zhu

et al. 2024

Materials

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Heterojunction semiconductors have been extensively applied in various optoelectronic devices due to their unique carrier transport characteristics. However, it is still a challenge to construct heterojunctions based on colloidal quantum dots (CQDs) due to stress and lattice mismatch. Herein, HgSe/CsPbBrxI3−x heterojunctions with type I band alignment are acquired that are derived from minor lattice mismatch (~1.5%) via tuning the ratio of Br and I in halide perovskite. Meanwhile, HgSe CQDs with oleylamine ligands can been exchanged with a halide perovskite precursor, acquiring a smooth and compact quantum dot film. The photoconductive detector based on HgSe/CsPbBrxI3−x heterojunction presents a distinct photoelectric response under an incident light of 630 nm. The work provides a promising strategy to construct CQD-based heterojunctions, simultaneously achieving inorganic ligand exchange, which paves the way to obtain high-performance photodetectors based on CQD heterojunction films.

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Section: Resultsmentioning

confidence: 77%