Efficiency Enhancement of P3CT-Na based MAPbI₃ solar cells via interfacial engineering
Said Kassou1*, Jia-Ren Wu1, Sheng Hsiung Chang1
1Physics, Chung Yuan Christian University, Taoyuan, Taiwan
* Presenter:Said Kassou, email:saidkassou1@gmail.com
Solar cells based on metal halide perovskites, with solution-based, cheap synthesis methods and a rapid increase in power conversion efficiency, are a promising candidate for future solar cells. The perovskite and the Hole transport layers (HTL) interface is the most important factors in determining both PCE and the stability of the Perovskite solar cells (PCSs). At this stage, it is crucial to understand in detail of mechanisms of the devices and determine the effect of physical and chemical processes on the conversion efficiency and their long-term stabilities. Herein, the power conversion efficiency (PCE) of polyelectrolytes (PC3T-Na) based MAPbI₃ solar cells can be increased from 14.94% to 17.46% with a wetting method before the spin-coating process of MAPbI₃ precursor solutions. The effects of the wetting process on the surface, structural, optical and excitonic properties of MAPbI3 thin films are investigated by using the atomic-force microscopic images, X-ray diffraction patterns, transmittance spectra, photoluminescence spectra and Raman scattering spectra. The experimental results show that the wetting process of MAPbI₃ precursor solution on top of the P3CT-Na/ITO/glass substrate can be used to manipulate the molecular packing structure of the P3CT-Na thin film, which determines the formation of MAPbI₃ thin films.

Keywords: P3CT-Na thin film, Wetting process, Stable inverted-type MAPbI3 solar cells