High Performance of Cs2AgBiBr6 Perovskite-based Photodetectors by Adding DEAC

Minjie Wu; Teng Chen; Xuedan Chen; Maoxue Wang; Chen Lv; Kai Meng; Shuanglong Yuan

doi:10.1002/chem.202403716

High Performance of Cs2AgBiBr6 Perovskite-based Photodetectors by Adding DEAC

Chemistry. 2024 Dec 28:e202403716. doi: 10.1002/chem.202403716. Online ahead of print.

Authors

Minjie Wu¹, Teng Chen², Xuedan Chen³, Maoxue Wang³, Chen Lv³, Kai Meng³, Shuanglong Yuan⁴

Affiliations

¹ East China University of Science and Technology, Key Laboratory for Ulitrafine Material of Ministry of Education, No.130 of Meilong Road, 200237, Shanghai, CHINA.
² East China University of Science and Technology, Key Laboratory for Ultrafine Materials of Ministry of Education, CHINA.
³ ECUST: East China University of Science and Technology, Key Laboratory for Ultrafine Materials of Ministry of Education, CHINA.
⁴ East China University of Science and Technology, School of Materials Science and Engineering, meilong Road, 200237, shanghai, CHINA.

PMID: 39731421
DOI: 10.1002/chem.202403716

Abstract

Perovskite-based photodetectors (PDs) are broadly utilized in optical communication, non-destructive testing, and smart wearable devices due to their ability to convert light into electrical signals. However, toxicity and instability hold back their mass production and commercialization. The lead-free Cs2AgBiBr6 double perovskite film, promised to be an alternative, is fabricated by electrophoretic deposition (EPD), which compromises film quality. Herein, we improved the quality of the Cs2AgBiBr6 films and the performance of PDs by adding N-acetylethylenediamine (DEAC) to Cs2AgBiBr6 perovskite precursor for EPD, in which the ligand DEAC provides a pair of lone electrons to Bi3+, forming coordinate covalent bonds. The optimized PDs have high detectivity, up to 4.4×1012 Jones, and high stability in the air. The high-performance, flexible Cs2AgBiBr6 perovskite PDs were fabricated on this basis, it also achieved the detectivity up to 3.2×1012 Jones with excellent bending cycle stability. These results propose a feasible approach to improving the crystallization of double perovskite thin films by introducing ligands during the EPD process. Furthermore, they demonstrate enhanced optoelectronic performance, indicating that this method is also applicable to halide perovskites, offering an effective strategy to improve their film quality.

Keywords: Cs2AgBiBr6; Electrophoretic Deposition; Flexible; Photodetectors.