[16p-C41-1~12] New direction of perovskite solar cells

6:15 PM - 6:30 PM JST(9:15 AM - 9:30 AM UTC)English Presentation

[16p-C41-12] Resolving the Light and the Thermal Stability Issues in the Tin-Lead Perovskite Solar Cells by Manipulating the Carrier Selective Layers with Dopant and/or Passivation

〇(PC)Shahrir Razey Sahamir¹, Takeru Bessho², Hiroshi Segawa², Qing Shen¹, Shuzi Hayase¹ (1.Univ. of Electro-Com, 2.Univ. of Tokyo)

Keywords:

tin-lead SnPb perovskite,light stability,thermal stability

The investigations into the stability issues in the tin-lead (SnPb) based perovskite solar cells (PSCs) have been increasing as of lately while the performance reaching more than 24% in efficiency has been reported ¹. It is important to achieve excellent stability under prolong light illumination and thermal exposure above the room temperature for the SnPb PSCs to compete with existing solar cells. Various reports are available on the stability improvement such as the introduction of additives or dopants in the active layer of the SnPb PSCs; substituting or passivating the PEDOT:PSS hole transport layer with non-acidic materials such as carbazole based self-assembled monolayer ^2,3, substituting the silver electrode with metal copper or carbon derived materials and many others. The core improvement of the stability based on these studies pin-point to the ion migrations as the main culprit for the stability issues in the PSCs. Thus, reinforcing the carrier selective layers seemingly important in order to mitigate the migrations of ions across the SnPb PSCs. In this research, we will demonstrate the effects of incorporating the carrier selective layers of the SnPb PSCs with dopant and/or passivation layer on their light and thermal stabilities. The preliminary results showed the PCE improvement to more than 22% efficiency and overall solar cell parameters such as FF, Jsc and Voc; due to the decrease in shunting and enhance recombination resistance which correlated well with the reduced migration of ions under XPS investigation near the electron transport layer. The light and the thermal stability studies were conducted on the SnPb PSCs with modified carrier selective layers showed enhanced stability under prolong exposure to light and elevated temperature.