Optical Properties of Thermally Evaporated CsPbBr3-Based Symmetric and Asymmetric Multiple Quantum Wells

Kwang Jae Lee

doi:10.3740/MRSK.2026.36.5.186

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2026 Vol.36, Issue 5 Preview Page Next Page

Research Paper

Optical Properties of Thermally Evaporated CsPbBr₃-Based Symmetric and Asymmetric Multiple Quantum Wells 열증착으로 형성된 CsPbBr₃ 페로브스카이트 기반 대칭 및 비대칭 다중양자우물(MQWs) 구조의 광특성 분석

27 May 2026. pp. 186-192

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Abstract

Lead halide perovskite semiconductors have attracted significant attention because of their defect tolerance, tunable bandgap, and excellent optoelectronic properties. In this work, symmetric and asymmetric multiple quantum wells (MQWs) based on CsPbBr₃ were fabricated using a thermal evaporation process, and their photoluminescence (PL) properties were systematically investigated. TPBi (2,2′,2″-(1,3,5-benzenetriyl)-tris(1-phenyl-1H-benzimidazole)) and BCP (bathocuproine) were employed as barrier materials to form Type I and Type II band alignments, respectively, resulting in distinct optical characteristics and carrier recombination behaviors in the MQW structures. Despite using the same CsPbBr₃ material, the MQWs exhibited significantly different PL characteristics depending on the band alignment and structural configuration. In particular, asymmetric MQWs with Type I and Type II band alignments exhibited completely different carrier dynamics in temperature-dependent PL measurements. The Type I structures exhibited thermally activated carrier redistribution, whereas the Type II structures showed dominant energy funneling toward the lowest energy states. These results demonstrate that carrier dynamics and optical properties in perovskite MQWs can be effectively controlled by band alignment and structural asymmetry, providing a direct physical basis for designing quantum well-based optoelectronic devices.

Keywords

CsPbBr₃

perovskite

thermal evaporation

quantum wells

photoluminescence

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 36
No :5
Pages :186-192
Received Date : 2026-04-15
Revised Date : 2026-04-22
Accepted Date : 2026-04-22
DOI :https://doi.org/10.3740/MRSK.2026.36.5.186

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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