Enhanced Efficiency of Solution-Processed Graphene/Silicon Heterojunction Solar Cells via Chemical Doping and Surface Plasmon Resonance
Wen-Chieh Lee1*, Wei-Chen Tu1
1Department of Electronic Engineering, Chung Yuan Christian University, Chung Li District, Taoyuan City,32023, Taiwan
* presenting author:Wen-Chieh Lee, email:g10376021@cycu.edu.tw
Graphene/silicon heterojunction solar cells attract intensive interest due to unique properties of graphene, simple device structure and the cost-effective process. In recent years, researchers have successfully fabricated high quality graphene using chemical vapor deposition (CVD). However, there is still difficulty to transfer as-grown graphene onto large-area and surface-textured substrates. The challenges include PMMA residue and damage or contamination of atomic layer graphene. Here, we report the solution-processed graphene/silicon heterojunction solar cell with a power conversion efficiency of 5.22%, which is comparable to the solar cells fabricated by transfer process. By using our proposed solution process, the device can be simply fabricated under low temperature without complex transfer procedures and the layer of graphene coated on the pyramid-textured silicon wafer can also be easily controlled. Furthermore, we treated graphene by nitric acid doping and incorporated graphene with silver nanoparticles to enhance the performance of solar cells by surface plasmon resonance effect. This low-cost and simple-fabrication method provides the potential for the development of next-generation graphene-based photovoltaic devices.

Keywords: Graphene, Solar Cells, Surface Plasmon Resonance, Simple-fabrication method