Lanthanide ion doping enabling highly sensitive and stable all-inorganic CsPbI2Br perovskite photodetectors

Zhiyuan Fang; Nan Ding; Wen Xu; Tianyuan Wang; Yue Wang; Lu Zi; Junhua Hu; Siyu Lu; Donglei Zhou; Xue Bai; Hongwei Song

doi:10.1039/D2TC05543K

Lanthanide ion doping enabling highly sensitive and stable all-inorganic CsPbI₂Br perovskite photodetectors†

Zhiyuan Fang,^a Nan Ding,^a Wen Xu,^ab Tianyuan Wang,^a Yue Wang,^a Lu Zi,^a Junhua Hu,

^c Siyu Lu,

^d Donglei Zhou,

^a Xue Bai

^a and Hongwei Song

*^a

Author affiliations

* Corresponding authors

^a State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China
E-mail: xuwen@dlnu.edu.cn, songhw@jlu.edu.cn

^b School of Physics and Materials Engineering, Dalian Minzu University, Dalian, China

^c State Centre for International Cooperation on Designer Low-Carbon & Environmental Materials, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

^d College of Chemistry, Zhengzhou University, Zhengzhou, China

Abstract

All-inorganic perovskites have been widely explored for high-performance photodetectors (PDs), owing to their high carrier mobility, long carrier diffusion length, and excellent visible light absorption, etc. However, the poor film quality of solution-prepared all-inorganic perovskites inevitably limits the development of PDs. Here, we present the successful incorporation of lanthanide ions (Ln³⁺ = Pr³⁺, Gd³⁺, Nd³⁺, Eu³⁺, Tm³⁺, Ho³⁺, and Yb³⁺) into all-inorganic CsPbI₂Br films to significantly improve the film quality and largely enhance the performance of PDs. Arising from the enlarged grain size and enhanced crystallinity of perovskite films upon Ln³⁺ doping, the detectivity (D*) and stability of PDs are significantly improved. In particular, PDs with Yb³⁺ doping achieve the best performance, and display an effective response range of 300–700 nm and quick response time (640 ns) with a D* of 4.6 × 10¹² Jones in contrast to 3.7 × 10⁹ Jones for pristine PDs. These findings offer new insights into the development of high quality perovskite films and highly sensitive and stable PDs.

Journal of Materials Chemistry C

Lanthanide ion doping enabling highly sensitive and stable all-inorganic CsPbI₂Br perovskite photodetectors†

Abstract

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Lanthanide ion doping enabling highly sensitive and stable all-inorganic CsPbI₂Br perovskite photodetectors

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Journal of Materials Chemistry C