| Affiliation: | 1. College of Physics and Optoelectronics, Key Lab of Interface Science and Engineering in Advanced Materials, Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024 P. R. China;2. College of Physics and Optoelectronics, Key Lab of Interface Science and Engineering in Advanced Materials, Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024 P. R. China
Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030006 P. R. China;3. Institute of Atomic and Molecular Science, Shaanxi University of Science & Technology, Xi'an, 710021 P. R. China;4. Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030006 P. R. China |
| Abstract: | 2D perovskites have attracted intensive attention by virtue of their excellent optical and electrical properties along with good stabilities. Herein, a highly sensitive self-powered photodiode based on (PEA)2(MA)4Pb5I16 (PEA=C6H5(CH2)NH3, MA=CH3NH3) 2D perovskite is demonstrated by dual interface passivations. The Al2O3 bottom passivation can reduce the pinhole defects in the 2D perovskite film and suppress the trap-related recombination loss, bringing forward much reduced dark current and increased photocurrent. The poly (methyl methacrylate) (PMMA) top passivation can encapsulate the 2D perovskite film and thus improve the stability of the device. These results show that the 2D perovskite-based photodiode with dual interface passivations exhibits a large photo-to-dark current ratio of 107, a fast response speed of 597 ns and a linear dynamic range of 160 dB without bias. Responsivity (R) and detectivity (D*) respectively reach 0.36 A W−1 and 5.4 × 1012 Jones under 532 nm laser illumination at a power density of 1.5 nW cm−2. Moreover, the dual interface passivated device exhibits good stabilities. This study paves the road for developing low-cost, low-power, solution processed image sensors. |
