Selection of Carrier Selective Layers that leads to an Improved Performance and Stability in Tin-Lead Perovskite Solar Cells
Shahrir Razey Sahamir a, Gaurav Kapil a, Takeru Bessho b, Hiroshi Segawa b, Qing Shen a, Shuzi Hayase a
a i-Powered Energy System Research Center (i-PERC), The University of Electro-Communications
b Research Center for Advanced Science and Technology (RCAST), The University of Tokyo 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
Tokyo, Japan, 2024 January 21st - 23rd
Organizers: Qing Shen and James Ryan
Poster, Shahrir Razey Sahamir, 091
Publication date: 18th October 2023

High efficiencies of more than 23% had been achieved in the tin-lead (SnPb) perovskite solar cells (PSCs) incentivized researchers to further explore and improve their performance and also stabilities. However, the SnPb PSCs are not quite reliable and at disadvantages when competing with other forms of solar cells due to their stability issues. In this study, we compared few options of carrier selective layers and their structures in an inverted single junction perovskite solar cell configuration. A proper selection of carrier selective layers allows us to restructure the PSCs in order to correct the energy alignment in solar cell devices for effective carrier extractions, reduced interfacial recombination and also promote a barrier for ions migration, thus enhanced the performance efficiency and their stabilities. High efficiency of >22% along with high photo and thermal stabilities were demonstrated when the above strategies were adopted. The SnPb PSCs which was stored in the nitrogen filled air are able to retain more than 99% of their efficiencies after 1 month of storage in dark, under nitrogen air. In term of thermal stability, the PSCs are able to retain >90% of their initial efficiencies after subjected to the temperature of 85 °C for over 1000 hours in nitrogen atmosphere. Our exploratory of the successful treatment of the doping and structuring strategies was followed with series of investigations which includes the morphological, structural and elemental assessment of the SnPb thin films before and after exposure to thermal heating via SEM, XRD and XPS. We will also demonstrate the effects of doping and structuring strategies via impedance spectroscopy experiment. Our research concludes that the most important factor that prevent the degradation in the SnPb PSCs underlies in the physical barrier that can restrict the ions migration. This valuable knowledge could help us in the fabrication of the SnPb PSCs with high efficiency and excellent performance stabilities.

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