journal article·2024-08-09Open access

Assessing the Optoelectronic Performance of Halide Perovskite Quantum Dots with Identical Bandgaps: Composition Tuning Versus Quantum Confinement

Long Hu, Xinwei Guan, Hehe Huang, Tingting Ye, Junfeng Ding, Aarti Aarti, Koushik Venkatesan, Weizhen Wang, Fandi Chen, Chun-Ho Lin, Tao Wan, Mengyao Li, Jiabao Yi, Rongkun Zheng, Dewei Chu, Songhua Cai, Jiayi Chen, Claudio Cazorla, Jianyu Yuan, Yang Bai, Tom Wu, Shujuan Huang

ACS Energy Letters· Volume 9· Issue 8

Abstract

Halide perovskite quantum dots (QDs) have been considered promising materials for constructing low-cost, high-performing optoelectronics. Tuning their bandgaps can be accomplished through size-dependent quantum confinement or altering chemical compositions. To unravel the differences and similarities between these two approaches, two types of QDs, namely, CsPbI 3 and CsPbI 2.5 Br 0.5 QDs, were synthesized with different sizes but with the same bandgap of 1.85 eV. Aberration-corrected scanning transmission electron microscopy reveals extensive structural defects and nonperovskite phase in mixed-halide QDs, correlating with the nonuniform strain distribution. Pressure-dependent photoluminescence (PL) suggests lower structural stability and distinct lattice distortion in mixed-halide QDs. Furthermore, time-resolved PL and transient absorption measurements indicate longer carrier lifetimes in pure-halide QDs. Finally, the CsPbI 3 QD solar cell delivered an enhanced power conversion efficiency of 16.1% compared with the mixed-halide counterpart (12.8%). This work provides valuable insights into tailoring quantum confinement and composition engineering strategies for achieving QDs with optimal optoelectronic performance.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, NSW 2052, Australia

School of Engineering, Macquarie University Sustainable Energy Research Centre, Macquarie University, Sydney, NSW 2109, Australia

Global Innovative Centre for Advanced Nanomaterials, School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, NSW 2308 Australia

Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, P. R. China

Key Laboratory of Materials Physics, Institute of Solid-State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

School of Natural Sciences, MQ Photonics Research Centre, Macquarie University, Sydney, NSW 2109, Australia

Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China

School of Physics, The University of Sydney, Sydney, NSW 2006, Australia

School of Molecular and Life Sciences, Curtin University, Bentley, Perth, WA 6102 Australia

Departament de Física, Universitat Politècnica de Catalunya, Campus Nord B4−B5, E-08034 Barcelona, Spain

Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, Guangdong China

Funding

Research Grants Council, University Grants Committee · National Key Research and Development Program of China · Australian Research Council · Hong Kong Polytechnic University

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