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High-Efficiency Perovskite Light-Emitting Diodes with Improved Interfacial Contact
Ruiying Li1, Lei Cai1, Yatao Zou1
1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, People's Republic of China.
ACS Applied Materials & Interfaces
|July 8, 2020
Summary
Engineers improved perovskite light-emitting diodes (PeLEDs) by inserting an aluminum oxide layer. This enhances charge injection and light out-coupling, boosting efficiency by 60% for better optoelectronic devices.
Area of Science:
- Materials Science
- Optoelectronics
- Device Engineering
Background:
- Unbalanced charge injection limits perovskite light-emitting diode (PeLED) efficiency.
- Solution-processed PeLEDs with multiple hole transport layers (HTLs) face challenges with layer redissolution, degrading electrical properties and film quality.
Purpose of the Study:
- To address charge injection imbalance and layer dissolution issues in solution-processed PeLEDs.
- To improve interfacial contact between HTLs and perovskite layers for enhanced device performance.
- To investigate the effect of an aluminum oxide (Al2O3) interlayer on PeLED efficiency and light out-coupling.
Main Methods:
- Engineered device structure by inserting an atomic layer-deposited Al2O3 interlayer between HTLs and the perovskite layer.
- Utilized poly(9,9-dioctyl-fluorene-co-N-(4-butylphenyl)diphenylamine) (TFB)/poly(9-vinylcarbazole) (PVK) and nickel oxide (NiO) as HTLs.
- Fabricated and characterized green PeLEDs to evaluate performance improvements.
Main Results:
- The Al2O3 interlayer improved interfacial contact, leading to enhanced perovskite film characteristics and balanced charge injection.
- The Al2O3 layer's refractive index facilitated better light out-coupling.
- Fabricated green PeLEDs demonstrated good repeatability with a 17.0% external quantum efficiency, a 60% improvement over control devices.
Conclusions:
- Inserting an Al2O3 interlayer is a viable strategy to enhance interfacial contact in PeLEDs.
- This method effectively balances charge injection and improves overall device efficiency.
- The findings offer a promising approach for developing high-performance perovskite-based optoelectronic devices.
