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A Transparent Electrode Based on Solution-Processed ZnO for Organic Optoelectronic Devices.
Zhi Chen1, Jie Wang1, Hongbo Wu1
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.
Nature Communications
|July 28, 2022
Summary
Researchers developed highly conductive and transparent zinc oxide (ZnO) films for indium tin oxide (ITO)-free optoelectronics. These novel ZnO electrodes enhance organic solar cell and LED performance by reducing losses.
Area of Science:
- Materials Science
- Optoelectronics
- Thin Film Technology
Background:
- Indium tin oxide (ITO) is a standard transparent conductive electrode in optoelectronics but faces cost and flexibility limitations.
- Developing ITO-free alternatives is crucial for advancing high-efficiency organic optoelectronic devices.
- High conductivity and transparency are essential for front electrode materials.
Purpose of the Study:
- To develop high-conductivity and high-transparency zinc oxide (ZnO) films for ITO-free organic optoelectronic devices.
- To investigate the persistent photoinduced doping effect for enhancing ZnO conductivity.
- To demonstrate the performance of ZnO electrodes in organic solar cells, photodetectors, and light-emitting diodes.
Main Methods:
- Sol-gel growth of ZnO films.
- Utilizing a persistent photoinduced doping effect to increase conductivity.
- Employing a sequential deposition strategy for stacking ZnO films.
- Fabricating and characterizing ITO-free organic optoelectronic devices (solar cells, photodetectors, LEDs) using ZnO cathodes.
Main Results:
- Achieved sol-gel-grown ZnO films with high conductivity (460 S cm⁻¹) and low optical absorption in visible and NIR regions.
- Demonstrated that photoinduced doping, attributed to hole trapping by oxygen vacancies, significantly increases ZnO conductivity.
- Further enhanced ZnO conductivity through a sequential deposition strategy.
- ZnO-based organic optoelectronic devices outperformed ITO-based devices due to reduced recombination and parasitic absorption losses.
Conclusions:
- Persistent photoinduced doping and sequential deposition are effective strategies for creating highly conductive ZnO films.
- Stacked ZnO films serve as superior alternatives to ITO for fabricating high-performance ITO-free organic optoelectronic devices.
- The developed ZnO electrodes minimize interfacial and parasitic absorption losses, leading to improved device efficiency.
