Citation: Mohamed Saber Lassoued, Faizan Ahmad, Yanzhen Zheng. Film thickness effect on 2D lead-free hybrid double perovskite properties: Band gap, photocurrent and stability[J]. Chinese Chemical Letters, ;2025, 36(4): 110477. doi: 10.1016/j.cclet.2024.110477 shu

Film thickness effect on 2D lead-free hybrid double perovskite properties: Band gap, photocurrent and stability

Mohamed Saber Lassoued ^{a, b} ,
Faizan Ahmad ^{a, b} ,
Yanzhen Zheng ^{a, b, *,}

a.
School of Chemistry, State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Key Laboratory of Electronic Devices and Materials Chemistry, Xi’an Jiaotong University, Xi’an 710054, China
b.
Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710054, China

zheng.yanzhen@xjtu.edu.cn

Received Date: 3 July 2024
Revised Date: 18 September 2024
Accepted Date: 19 September 2024
Available Online: 20 September 2024

Figures(5)

Lead-free hybrid double perovskites (LFHDPs) have received a lot of attention due to their environmental friendliness and promising attributes. However, studying the effect of film thickness on LFHDPs optoelectronic properties has not yet been investigated. Herein, we synthesized two new Ruddlesden–Popper LFHDPs, namely (C₅H₁₂N)₄AgBiI₈ (CAB-1) and (C₆H₁₄N)₄AgBiI₈ (CAB-2) using cyclopentylamine and cyclohexylamine as monoamine ligands. Indeed, these two Ag(Ⅰ)-Bi(Ⅲ) LFHDPs form smooth and uniform films ranging in thickness from 250 nm to 1 µm, with preferred orientations. Notably, the studies on the optical properties showed that the direct band gap value decreased from 2.17 eV to 1.91 eV for CAB-1 and from 2.05 eV to 1.86 eV for CAB-2 with increasing thickness. Accordingly, photo-current response using a xenon lamp revealed a significant difference of over 1000 nA between light and dark conditions for 1 µm-thickness films, suggesting potential for light harvesting. Other than that, thicker films of CAB-1 and CAB-2 exhibit high stability for 90 days in a relatively humid environment (RH of 55%), paving the way for promising optoelectronic applications.
- Lead-free,
- Double perovskites,
- Film thickness,
- Photocurrent response,
- High stability
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