Enhanced Interfacial Exciton Transport in Mixed 2D/3D Perovskites Approaching Bulk 3D Counterparts
Mixed 2D/3D halide perovskites possess unique optoelectronic properties and strong structural stability, making them promising for various light-harvesting and -emitting applications. However, the long-chain organic cations have low charge conductivity and create potential barriers within the inorganic frameworks, which limit efficient exciton and carrier transport. In this study, we propose a method to improve exciton transport in 2D/3D perovskites by adjusting the conjugation interactions of long-chain ligands. Through time-resolved spectroscopy and high-resolution transmission electron microscopy, we establish the relationship between the microstructure of 2D/3D perovskites and exciton mobility. We successfully create a 2D/3D halide perovskite film with an exciton transport value of 92 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup>, approaching its 3D bulk counterparts. We explain that the strong interligand conjugation of the naphthylmethylammonium cation aids in forming a 2D phase with a small <<i>n</i>> value, which compresses the 2D domains to the nanometer scale, thereby enhancing carrier tunneling and exciton mobility across the 3D grain boundaries. These findings offer helpful perspectives for the development of high-mobility mixed 2D/3D perovskite films for applications in solar cells, light-emitting diodes, and photodetectors.
Authors
- Xinyi Deng (ORCID: https://orcid.org/0000-0002-9181-2236)
- Jiepeng Song (ORCID: https://orcid.org/0000-0002-7982-1826)
- Xiaoxu Zhao (ORCID: https://orcid.org/0000-0001-9746-3770)
- Xiaocang Han (ORCID: https://orcid.org/0000-0001-8458-5568)
- Xinghong Cai (ORCID: https://orcid.org/0000-0001-7633-2325)
- Guichuan Xing (ORCID: https://orcid.org/0000-0003-2769-8659)
- Yiyang Gong
- Shuai Yue (ORCID: https://orcid.org/0000-0003-3613-7271)
- Min Wang (ORCID: https://orcid.org/0000-0002-5160-7852)
- Qing Zhang (ORCID: https://orcid.org/0000-0002-6869-0381)
- Chun Li (ORCID: https://orcid.org/0000-0002-3132-3756)
- Xinfeng Liu (ORCID: https://orcid.org/0000-0002-7662-7171)
- Yin Liang (ORCID: https://orcid.org/0000-0003-2665-6078)
- Bo Wu (ORCID: https://orcid.org/0000-0002-7386-8279)
- Cheng Yang (ORCID: https://orcid.org/0009-0009-3688-8180)
- Meili Li (ORCID: https://orcid.org/0000-0002-4546-5325)
- Peng Gao (ORCID: https://orcid.org/0000-0003-0860-5525)
- Kwok Kwan Tang
- Xiaoyue Gao
Institutions
- Southwest University (CN)
- South China Normal University (CN)
- Peking University (CN)
- University of Macau (MO)
- Center for NanoScience (DE)
- National Center for Nanoscience and Technology (CN)
- Advanced Materials and Technologies (Slovenia) (SI)
Publication Details
- Journal
- ACS Nano
- Published
- 2025-05-09
- DOI
- https://doi.org/10.1021/acsnano.5c04246
- Citations
- 7
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 5.11
Funders
- Chinese Academy of Sciences
- National Key Research and Development Program of China
- National Science Fund for Distinguished Young Scholars
- Basic and Applied Basic Research Foundation of Guangdong Province