A novel way to enhance the Self-stability of Un-capsulated Polycrystalline MAPbI3 Solar Cells

Diksha Thakur^1*, Shou-En Chiang¹, Mu-Hsueh¹, Jyh-Shyang Wang¹, Sheng Hsiung Chang¹

¹Physics, Chung Yuan Christian University, Zhongli, Taoyuan, Taiwan

* Presenter:Diksha Thakur, email:dikshathakur200596@gmail.com

Fullerene additives can be used to enhance the stability of perovskite solar cells. In this paper we briefly compared the effects of addition of urea and fullerene additives on the day dependent photovoltaic performance of perovskite solar cells. Power conversion efficiency with C₆₀ small molecules largely increased from 16.39 % to 18.99% on the 2nd day. Atomic force microscopic images, X ray diffraction, day- dependent photoluminescence spectra (PL) and temperature dependent PL are used to study the structural, optical and excitonic properties of polycrystalline MAPbI₃ thin films with different additives. Experimental results show that the chemical bond between C₆₀ and MA cations is formed and thereby stabilizing the MAPbI₃ crystal thin films. In other words, stable and highly efficient P3CT-Na based MAPbI₃ solar cells can be realized when surface defects of MAPbI₃ crystal grains are passivated with MA-C60-MA cations. Our results provide a simple way to increase the device stability of the solution- processed polycrystalline MAPbI₃ thin films based solar cells.

Keywords: Stability, Polycrystalline MAPbI3 thin films, MA-C60-MA cations